Posts filed under 'Neuroscience'

The limits of fMRI for understanding political behavior

In Cerebrum, the popular magazine on brain science, Geoffrey Aguirre critiques recent far-fetched claims for the power of fMRI to reveal secret political beliefs, and many other secrets as well. this article stands as a reminder of the limits of current technology that is often hyped as being able to reveal our deepest secrets:

The Political Brain
September 12, 2008

By Geoffrey Aguirre

Research using neuroimaging to detect the emotional response of undecided voters has led to controversy among scientists. An op-ed article in the New York Times, written by the leader of one such study, argued that brain scans could help determine the voters’ true feelings about candidates, eventually making pollsters obsolete. Dr. Geoffrey Aguirre discusses the flaws of Iacoboni’s argument, the feasibility of this method to determine hidden preferences and the ethical issues inherent in the process.

By November 11, 2007, the Democratic and Republican presidential nominating contests were well under way. The Democratic candidates spoke that night at the Jefferson-Jackson fund-raising dinner in Iowa, and a second debate was approaching for the Republicans. With the first votes of the caucuses and primaries only weeks away, pollsters and pundits were working to divine the intentions of voters, particularly the coveted “swing” voters not committed to a candidate. Which Republican would appeal to women, closing the so-called “gender gap”? Was anyone truly undecided regarding Mrs. Clinton, a candidate who had been in the political spotlight for more than 15 years? That Sunday, the op-ed page of the New York Times promised insight into these central questions, in the surprising form of pictures of brain activity.

Neuroscientists from the University of California, Los Angeles, led by Marco Iacoboni, had used functional magnetic resonance imaging to measure the responses of undecided voters to the candidates. Their conclusions were startling in their depth and breadth. One Republican candidate, Fred Thompson, was found to evoke particularly strong feelings of empathy. Further, while some voters said that they disapproved of Hillary Clinton, their brain activity revealed that they had unacknowledged impulses to like her. The study had seemingly reached into the minds of voters and plucked out their hidden emotions and conflicts. Perhaps political talk-show hosts and Gallup pollsters would soon be unnecessary. Why analyze and poll when the feelings and intentions of voters could be read directly from their brains?

Instead of sparking a revolution in political science, however, the editorial provoked broad condemnation from the neuroscience community. Within days the New York Times had published a letter from 17 scientists who argued that the study was fundamentally flawed. At scientific meetings and on the discussion boards of Web sites the hue and cry continued. The prominent scientific journal Nature published a scathing editorial that lamented the absurdity of the study. After more than a decade of increasing publicity for brain-scanning results in the lay press, the Iacoboni editorial had provoked a backlash. Neuroimaging had jumped the shark.

For his part, Iacoboni defended his study. In an online letter, he argued that the approach he used in his study of voters is common to many cognitive neuroscience experiments. If all those previous studies were valid, he asked, was his study considered flawed simply because he had left the ivory tower to examine political candidates or reported his results in a newspaper? Iacoboni’s defense raises challenging questions for scientists and consumers of scientific studies. If his group’s undecided-voter editorial column is flawed, are there scientific studies that use comparable methods, published in respected, peer-reviewed journals, that are also absurd? What, exactly, was so wrong with his study given that it used modern neuroimaging techniques and analyses? Could there be valid studies of political topics that would either provide insight into political thought or be of value to a pollster or candidate? To address these questions, we must first understand how raw neuroimaging data can be transformed into a picture of brain activity that a researcher might interpret as showing latent sympathy for Hillary Clinton.

Brain Imaging Approaches

Magnetic resonance imaging (MRI) has been used for some decades to construct pictures of brain anatomy. Functional MRI (fMRI), developed in the 1990s, offers a measure of brain activity. For fMRI data to be collected, a participant lies on a table that is slid within a powerful magnet. The subject receives instructions and is presented with pictures and sounds during the scan. Meanwhile, weak radio waves are used to measure the effect that nerve cell activity has upon the magnetic field. The effect is indirect; local changes in brain activity induce a cascade of effects upon blood flow, upon oxygen, and in turn upon the iron atoms in hemoglobin molecules that ultimately warp the microscopic magnetic field. The procedure is extremely safe, painless, and it can be completed in about an hour. Nerve cell activity can be measured over the entire brain from second to second, and with millimeter resolution.

An image of brain activity is not available immediately after the scan. To create a picture, a researcher must first decide which two (or more) behavioral conditions are to be compared. This is an important, and generally unrecognized, aspect of neuroimaging studies. There is no brain picture “for” anxiety or memory. Instead, the experiment must compare the relative brain activity between two behavioral states, with the hope of isolating the mental operation of interest. To study anxiety, one might present the subject with pictures of snakes and guns and then at another time show pictures of puppies and flowers. The experimenter might conclude that a brain region, such as the amygdala, that shows a greater neural response to the snakes than the puppies is responding to the differential anxiety provoked by the stimuli. The colorful brain image simply shows where statistically greater activity was seen for one condition as compared to the other.

This approach to brain imaging, in which the experimenter tries to manipulate the mental state of a subject in order to then observe the evoked brain activity, is termed “forward inference.” Experiments like this dominated the application of neuroimaging for many years. The study of sensory processing has been particularly successful, in part because the mental states to be studied can be differentially evoked quite readily. For example, a brain region, “area MT,” has been identified that invariably responds when the subject sees something moving but does not respond to static pictures. Neuroimaging and forward inference have been used to study more-complex behavioral states as well, such as emotion, conflict resolution, sense of self and reward processing. Specific brain areas have been found that reliably increase their neural activity during these behaviors, although the link between a particular behavior and a brain region is more tenuous. First, it is challenging, and in some cases arguably impossible, to compare two complex behavioral states and leave behind the isolated mental concept of, for example, greed, or risk-taking. These behaviors are necessarily embedded in complex tasks and emotions and cannot be isolated by experimental design in the same way that visual motion may be. Second, the attempt to map a single behavior to a single brain region quickly breaks down past early sensory representation. The amygdala may consistently respond more strongly to anxiety-provoking stimuli, but it is also activated by positive stimuli (puppies and flowers) as compared to neutral pictures (toasters and trees). The state of affairs is even worse for areas of the frontal lobe, where dozens of different mental operations have been identified that might activate a given square centimeter of cortex. A related complication is that different subjects may have quite different behavioral or emotional responses to a particular experimental situation, foiling attempts to describe a consistent relationship between behavior and brain region for a population.

The application of neuroimaging to political questions does not involve “forward inference,” however. Political neuroimaging, along with the burgeoning fields of social, economic, and even marketing neuroscience, relies upon the opposite approach. Instead of determining the brain region associated with a particular behavioral state, a “reverse inference” study attempts to identify the behavioral state of subjects by observing their brain activity. Initially, studies of this kind examined basic sensory phenomena. The activity within the aforementioned area MT might be used to determine if a particular optical illusion induces a sense of motion in some people. Such a conclusion could be well supported. After dozens of “forward inference” studies, it has become quite clear that the perception of motion, and only motion, is always associated with activity in this patch of cortex. The reverse inference approach has also been used to probe more-complex behaviors. Activity within the insula when a subject is presented with recognizable lies has been taken as evidence that lies induce the same sense of disgust that rotten food does, as the latter has also been observed to activate the insula.

The Trouble with Reverse Inferences

The problem, of course, and the source of the widespread displeasure with Iacoboni’s newspaper article, is that these reverse inferences are only as good as the evidence that supports a unique mapping of a particular mental operation to a particular cortical region. And for many of the claims that Iacoboni makes, this evidence is not good at all. The presence of an amygdala response to pictures of Mitt Romney did not necessarily indicate anxiety regarding his becoming president, as positive emotions can activate this region as well. A further limitation is that the response to pictures of Mr. Romney was compared to (presumably) the neural response elicited by a blank screen. The amygdala response may have been not to Mr. Romney per se but to his attractive hair. Finally, even if we were to grant that amygdala responses indicate anxiety, and were specific to Mr. Romney himself, perhaps the subject was simply anxious because his favorite candidate, Mitt, was not doing well in the polls!

Further compounding these weaknesses is Iacoboni’s tendency to engage in what might be termed “neuromythology.” When presented with a picture of a brain with colorful activity, he has a tendency to spin a yarn to explain what he sees. The claim that voters who stated a dislike for Mrs. Clinton actually harbored latent kind feelings toward her was not even partially implied by the faulty logic of the study; rather, it was an explanation, made up from whole cloth, for the observation of cortical activity that implied “conflict.” This unfortunate tendency to treat neuroimaging data as a Rorschach blot is on full display in a recent article in the Atlantic in which the author, Jeffrey Goldberg, visits with Dr. Iacoboni and his associates who operate a “neuromarketing” company. The initially uncomfortable finding that Mr. Goldberg had a “positive, reward” response to a picture of Mahmoud Ahmadinejad leads to the tortured explanation that the author is actually imagining the happy day that the Iranian president is deposed. Equally bereft of logic is the explanation of how the equivalent responses of Mr. Goldberg’s brain to Hillary Clinton and his own wife actually signify two quite different behavioral states.

Does the preceding criticism suggest that a valid study of political behavior using neuroimaging is not possible? No. Instead, while there are pitfalls to be avoided, much might be learned regarding the behaviors and emotional states that people develop and deploy in evaluating political candidates. To be successful, such studies must compare carefully controlled states to isolate a behavior of interest and draw well-supported inferences regarding the activity seen. In fairness, Iacoboni and his colleagues have published an example of such a study (Neuropsychologia 2007 Jan 7;45(1):55–64). Beyond simply being valid, however, there is an additional requirement that a neuroimaging study of political behavior be useful: it must provide an insight not available by simply asking a voter his or her opinion.
Imaging Versus Polling

For the most part, human behavior is readily available to be observed or queried. It would not come as a surprise to learn that voters who identify strongly with one party tend not to like candidates from the other party. Thus, it seems an unnecessarily roundabout way to learn this truth by measuring increased amygdala and insula responses to pictures of opposing candidates. Similarly, if you want to know how someone will vote for a candidate, you can generally just ask the person. The chief challenge for pollsters is obtaining a sample of responses that are representative of the population, a problem that would not be solved by neuroimaging. There is nothing automatically more informative about measuring neural activity as compared to directly observing behavior.

There are many circumstances, however, in which asking voters their opinions will not provide the entire story. In the face of an overt desire to mislead or a simple lack of introspection, neuroimaging of political behavior might provide insights not otherwise available. For example, a plausible study might examine the emotional response to political “spin.” Politicians frequently provide an unrealistically favorable description of events, omitting details that are inconvenient. While voters claim that they object to spin, they may nonetheless respond positively. Given previous studies that have identified patterns of brain responses for overt lies as compared to truths, what is the response to spin? Is spin treated as a lie, and how is this modulated by one’s political affiliation? There are certainly many other topics in the realm of political behavior that fall into this category and could eventually come under study.

We may also consider applications of neuroimaging techniques to assist polling in cases where voters are unwilling or unable to provide accurate responses. Obviously, a source of much uncertainty in polling results is “undecided voters.” Perhaps some proportion of voters really do have a strong preference but are insufficiently confident to share this with a pollster. Further, voters may consider one candidate to be the more socially acceptable choice to report to the pollster, although they intend to choose the other in the privacy of the voting booth. This is the “Bradley effect,” named for Tom Bradley, an African American former mayor of Los Angeles who lost his 1982 race for governor despite polling that showed him ahead of his white opponent.

Could neuroimaging be used to determine true voting preference in these cases? Perhaps, although not in any straightforward way. Simply presenting the candidates’ pictures and recording a response would not be enough. As we have considered, the presence of, for example, an amygdala response to one candidate cannot be taken as evidence that the voter will vote a certain way. Recently, techniques to analyze the pattern of neural responses across the entire brain have been developed. These “multi-voxel patterns” (MVPs) can be used to deduce a subject’s unstated intention in controlled settings. For example, if a subject is presented with two targets on a screen and told to choose one but not yet indicate which, the choice can be accurately read from the MVPs in advance of the response. It is possible that the pattern signature for responses for a given voter could be measured while the person is making a series of innocuous decisions. In the critical test, the subject would then be presented with pictures of the candidates, side by side. Although the voter would withhold an overt response, the implicit preference might be available in the distributed fMRI data.

Suppose that this were shown to be a valid way to measure implicit voter preference—would it be of practical value? Only a small number of subjects could ever be examined in this fashion, as the collection of such data is a time-consuming and expensive undertaking. Further, obtaining a representative sample would be very difficult, as older subjects, for example, generally find it hard to participate in an hour-long, uncomfortable neuroimaging scan. Finally, simple polling questions and adjustments are available to address these challenges. Undecided voters can be asked to indicate which way they “lean,” which predicts well how they will ultimately vote. The magnitude of the Bradley effect can be estimated by asking a voter if she thinks her friends and acquaintances would be hesitant to vote for a certain candidate, even if she professes to have no such qualms. Indeed, a recent paper in the journal Science has demonstrated that purely behavioral techniques can be used to accurately predict the way an undecided subject will eventually vote.

Therefore, it seems unlikely that neuroimaging techniques will have much impact upon the practice of politics. Ultimately, politicians and political operatives care about behavior—if and how a voter will vote—and not much about the underlying neural basis for these actions. Simple polling provides this information much more readily and inexpensively than neuroimaging could ever do. In contrast, neuroimaging may find a place in the study of political science, in which the underlying motivations and behavioral states of voters have become an area of increasing interest.

Neuroimaging Our Preferences Versus Our Preference for Neuroimages

We have considered that neuroimaging techniques may be able, in principle, to identify voter preference. While this ability may be desired by politicians, it may be rejected by the polity. The secrecy of an individual’s ballot is a cornerstone of modern democracy; if our voting preferences were known we could be subject to the threat of retribution by a government we voted against. Fortunately such an abuse of neuroimaging is unlikely. Given the size and noise of an fMRI scanner, no one could be scanned unknowingly. Moreover, an fMRI study requires tremendous subject cooperation, making these studies trivially easy to defeat.

While of little immediate risk, the possibility that neuroimaging might invade our political privacy has been of concern to ethicists who anticipate the impact of emerging neuroscience technologies. This attention is not inappropriate. It is almost certainly better for philosophers and ethicists to have their say before a technological revolution sweeps an unprepared society. I believe, however, that the attention and concern devoted to the possibility of a neuroimaging invasion of political privacy is somewhat misplaced. Greater and more immediate threats to privacy loom. In the same way that behavior in a laboratory setting or in a formal poll can accurately predict a voter’s preference, so can our routine, daily actions provide a window to our intentions. Knowledge of where we live, what we buy, how we travel, and who we know can be aggregated to provide information about our preferences. The possibility of this silent, creeping invasion of our privacy, advanced by profit-seeking corporations and terrorist-seeking government agencies, strikes me as far more menacing than the clanging of a seven-ton MRI scanner.

Instead of a threat to privacy, the principal risk is that misuse of neuroimaging will add further distraction and irrelevance to the political process. Although carefully designed neuroimaging studies might eventually provide valuable insights into political decision making, the slow, unglamorous grind of the scientific process will leave us time to be tempted by colorful pictures of the brain and stories of secret voter intention. The New York Times op-ed page is arguably the most influential two square feet of newsprint in American politics. The editorial column by Iacoboni and his colleagues stands as a testament not to the power of neuroimaging to make manifest our political preferences but to the manifest preference we all have for neuroimages.

Add comment September 15th, 2008

High-tech interrogations may promote abuse

Among certain circles, including the American Psychological Association, we need more research on effective interrogation strategies. Many of us have been suspicious that these calls may cover the design of technologies that will create high-tech tools aiding abusive interrogations. In 2003, the APA sponsored, with the CIA and Rand Corp., a Science of Deception Workshop. CIA contractor torturers James Michell and Bruce Jessen were at this invitation-only conference, which discussed such topics as use of truth serums and the role of sensory overload in interrogations.

According to a press release from the Penn State University, bioethicist Jonathan Marks raises the specter of fMRI technology being used in ways that increase the likelihood of abuse. after all, if a high-tech tool suggests that someone is a “terrorist,” the potential for subjecting them to “harsh techniques” to get information from them is increased.

High-tech interrogations may promote abuse

There is evidence that brain imaging technology is being used to interrogate suspected terrorists despite concerns that it may not be reliable, and that it might inadvertently promote abuse of detainees, according to a Penn State researcher. He says the risk that such technology could license further abuse of detainees remains ever present, given President Bush’s March 8 veto of legislation that would have prohibited the CIA from conducting aggressive interrogations.

The technology - functional magnetic resonance imaging or fMRI - has been around since the 1990s. Neurosurgeons routinely use it to scan for brain tumors, and to diagnose and treat various disorders of the central nervous system.

But in recent times, fMRI has gained support from many in the intelligence community, who feel it could be a reliable tool in identifying terrorists from a group of suspects or detecting lies during an interrogation.

After the 9/11 terrorist attacks, military psychologists attached to intelligence units advised interrogators how to increase interrogation stressors and exploit detainees’ fears to make suspects talk, according to Jonathan Marks, associate professor of bioethics, humanities and law at Penn State.

“The problem is, if you apply pressure, people will say anything they think will make you stop. And that means anything they think you want to hear,” he said.

There are also reports that psychotropic drugs - so-called truth serums - have been administered. The use of brain imaging technologies appears to offer an alternative to such approaches.

The adoption of fMRI is not surprising given the limitations of other lie detection techniques such as a polygraph test, said Marks, whose analysis is published in a recent issue of the American Journal of Law and Medicine.

A polygraph relies on detecting accentuated signs of anxiety such as changes in skin conductance, heart rate, and respiration. But it is useless against sociopaths, and those trained to beat it. Counterintelligence experts also say the device is especially unreliable when questions and answers are translated with the help of an interpreter, as has been the case in Iraq.

Intelligence personnel believe fMRI could circumvent such limitations, and some commentators have argued that fMRI could render torture and interrogation obsolete. But Marks, who has critiqued the use of aggressive interrogation techniques in the war on terror, makes a case that “such claims are unfounded, and that the uncritical acceptance of fMRI as an interrogation tool could be potentially hazardous both to the health of the detainee and to the counterterrorism mission.”

Unlike a polygraph, an fMRI uses powerful magnetic fields to detect tiny changes in blood oxygen levels in the brain. Since active neurons take up more oxygen than inactive ones, these tiny changes are believed to be signatures of cognitive processes.

Some intelligence experts believe that fMRI can be used to detect deception, or to flag when a suspect recognizes (but may not wish to admit that he recognizes) the photograph or name of a suspected terrorist.

Marks, who also heads the Bioethics and Medical Humanities Program at Penn State’s University Park campus, finds the approach problematic. “There can be all sorts of reasons for recognizing a name or a photograph or for responding cognitively to a particular word,” he said. “I spent years living in London, listening to reports of IRA bombings. My brain would light up if you mentioned the word semtex (a plastic explosive).”

Interrogations that employ fMRI may also be making a considerable leap of faith. According to Marks, fMRI-based studies of lie detection have only been conducted on small groups of healthy people to examine changes in blood oxygen levels in the brain when they are lying in highly artificial laboratory settings. These results cannot be generalized, he argued, and should not be applied to terror suspects who have usually been detained in stressful circumstances and may have mental health issues that could clearly be exacerbated by their detention.

“MRI machines are very useful diagnostic tools but using them to claim that certain things are going on inside people’s minds is a major jump,” said Marks, who is also a research fellow and acting director of Penn State’s Rock Ethics Institute. Such a jump is a particularly dangerous one in the interrogation context, he argues.

The short duration of the test is another worry. According to the Penn State researcher, many neuroscientists argue that it could take many hours, even weeks, of testing with the suspect before getting accurate baseline readings.

Marks also argues that fMRI scans are open to broad interpretation, but they can produce seductively persuasive graphic images that provide a false sense of security and help create a narrative that may lead to aggressive interrogation tactics.

“One of the real concerns I have is that you can see how people can begin to say ‘the fMRI picked him out as a terrorist so let us give him a going over in the interrogation room,’ ” Marks explained. “Contrary to the view that fMRI will render torture obsolete, it might become a license for further abuse of detainees because its readings will convince people that they have a terrorist on their hands.”

The Penn State bioethicist says his view, which draws on the previously unpublished statements of an experienced U.S. interrogator, raises fundamental concerns about the use of fMRI either to detect deception or to flag recognition of a stimulus. If a terror suspect does recognize a certain stimulus, that person could be singled out for more aggressive interrogation.

1 comment March 19th, 2008

Olson: From Mirror Neurons to Moral Neuropolitics

Political scientist Gary Olson has been writing on the biological basis of empathy and the potential of this biology creating a foundation for a more communal, noncapitalist society. He has sent me his latest work, which draws upon recent research on mirror neurons, neurons that model perceptions of others and which may provide as basis for empathy.

I find this very interesting. However, I caution that research on mirror neurons is very new and there is still considerable controversy as to how far beyond simple perception of the other’s motion, into affective life, these types of neurons extend.

Another issue that I would give a greater prominence to is the human potential for destructiveness. Progressive visions need, somehow, to come to terms with the potential within each of us to hurt and to destroy. We may have a built-in potential for empathy, but we have many other, darker potentialities as well.

I’m sure readers will have their own thoughts as they engage with Olson’s knowldgeable and stimulating piece.If anyone is moved to write a more extended comment on Olson’s article, I’d be delighted to post it.

From Mirror Neurons to Moral Neuropolitics

Gary Olson

“Empathy is the only human superpower-it can shrink distance, cut through social and power hierarchies, transcend differences, and provoke political and social change.”
-Elizabeth Thomas

“The success of the abolitionist movement lay in its making real for people in Britain and America the slave ship’s pervasive and utterly instrumental terror, which was indeed its defining feature.”
-Marcus Rediker

“The official directives needn’t be explicit to be well understood: Do not let too much empathy move in unauthorized directions.”
-Norman Solomon

In his magisterial study, The Slave Ship, maritime historian Marcus Rediker has documented the role played by emotional and especially visual appeals in ending the trans-Atlantic slave trade. Not unlike the structural violence endemic to global capitalism today, the abolitionist James Field Stanfield argued that the terrible truths of the slave trade “had been withheld from the public eye by every effort that interest, ingenuity, and influence, could devise.” (Rediker, 2007, p. 133) Therefore, “Stanfield appealed to the immediate, visceral experience of the slave ship, over and against abstract knowledge about the slave trade, as decisive to abolition. . . .” (p. 156) The abolitionist’s most potent weapon was the dissemination of drawings of the slave ship Brooks. Rediker asserts that these images were “to be among the most effective propaganda any social movement has ever created.” (p. 308)

Based on recent findings from neuroscience we can plausibly deduce that the mirror neurons of the viewer were engaged by these images of others suffering. The appeal was to the public’s awakened sense of compassion and revulsion toward graphic depictions of the wholesale violence, barbarity, and torture routinely practiced on these Atlantic voyages. Rediker notes that the images would instantaneously “make the viewer identify and sympathize with the ‘injured Africans’ on the lower deck of the ship . . .” while also producing a sense of moral outrage. (p. 315)

In our own day, the nonprofit Edge Foundation recently asked some of the world’s most eminent scientists, “What are you optimistic about? Why?” In response, the prominent neuroscientist Marco Iacoboni cited the proliferating experimental work into the neural mechanisms that reveal how humans are “wired for empathy.” This is the aforementioned discovery of the mirror neuron system or MNS. The work shows that the same affective brain circuits are automatically mobilized upon feeling one’s own pain and the pain of others.

Iacoboni’s optimism is grounded in his belief that with the popularization of scientific insights, these findings in neuroscience will seep into public awareness and ” . . . this explicit level of understanding our empathic nature will at some point dissolve the massive belief systems that dominate our societies and that threaten to destroy us.” (Iacoboni, 2007, p. 14, 2008) In similar fashion, Steven Pinker concludes a recent piece on the science of morality with these challenging but hopeful words from Anton Chekov, “Man will become better when you show him what he is like.” (Pinker, 2008)

In 1996, through single cell recordings in macaque monkeys researchers reported the discovery of a class of brain cells dubbed “mirror neurons” (Gallese, 1996). Located in area F5 of the premotor cortex, these mirror neurons fired not only when the monkey made an action, but also when the monkey was observing somebody else making the same action. The monkey’s neurons were “mirroring” the activity she was observing. Later on, by mapping regions of the human brain using Functional Magnetic Resonance Imaging (fMRI), it was discovered that human areas that presumably had mirror neurons also communicated with the brain’s emotional or limbic system, facilitating connection with another’s feelings, probably by mirroring those feelings. This neural circuitry is presumed to be the basis of empathic behavior, in which actions in response to the distress of others are virtually instantaneous. As Goleman puts it, “That this flow from empathy to action occurs with such automaticity hints at circuitry dedicated to this very sequence.” For example, in the case of hearing a child’s anguished scream, “To feel distress stirs an urge to help” (Goleman, 2006, p. 60).

The existence of empathy, mirror neurons was only inferred by these fMRI studies. But in 2007, Iacoboni, the neurosurgeon Itzhak Fried and their associates at the University of California at Los Angeles (UCLA), studied brain activity in people who had already been wired up by Fried who was attempting to uncover the origins of their epileptic seizures. Through the insertion of electrodes into the frontal lobes, this team of scientists identified several mirror neurons that were activated by both performance and observation of an activity.

Valayanur Ramachandran, director of the Center for Brain and Cognition at the University of California at San Diego (UCSD) observes, “We used to say, metaphorically, that ‘I can feel another’s pain,’ but now we know that my mirror neurons can literally feel your pain.” (Slack, 2007) Ramachandran, who calls them “empathy neurons” or “Dalai Lama neurons,” writes that “In essence the neuron is part of a network that allows you to see the world ‘from the other person’s point of view,’ hence the name ‘mirror neuron.’” (Ramachandran, 2006)

Giacomo Rizzolatti, the Italian neuroscientist who discovered mirror neurons, notes that this hardwired system is what permits us “to grasp the minds of others not through conceptual reasoning but through direct simulation by feeling, not by thinking” (Rizzolatti in Goleman, 2006). As Decety notes, empathy then allows us to “forge connections with people whose lives seem utterly alien from us” (Decety, 2006, p. 2). Where comparable experience is lacking, this “cognitive empathy” builds on the neural basis and allows one to “actively project oneself into the shoes of another person” by trying to imagine the other person’s situation (Preston, in press), Preston and de Waal (2002). Empathy is “other directed” and recognizes the other’s humanity. Little wonder that some scientists believe the discovery of mirror neurons is the most significant neurological finding in decades, perhaps rivaling what the discovery of DNA was for biology. (Ramachandran, 2006)

The neuroscience of empathy parallels investigations being undertaken in cognate fields. Some forty years ago the celebrated primatologist Jane Goodall observed and wrote about chimpanzee emotions, social relationships, and “chimp culture,” but experts remained highly skeptical. A decade ago the famed primate scientist Frans B.M. de Waal (1996) wrote about the antecedents to morality in Good Natured: The Origins of Right and Wrong in Humans and Other Animals, but scientific consensus remained elusive. All that’s changed. As a recent editorial in the journal Nature (2007) put it, it’s now “unassailable fact” that human minds, including aspects of moral thought, are the product of evolution from earlier primates. According to de Waal “You don’t hear any debate now.” In his more recent work, de Waal plausibly argues that human morality-including our capacity to empathize-is a natural outgrowth or inheritance of behavior from our closest evolutionary relatives.

Overwhelming evidence has been marshaled to support E.O. Wilson’s early claim that not only were selfish individuals sanctioned but “Compassion is selective and often ultimately self-serving.” (Wilson, 1978)

Following Darwin, highly sophisticated studies by biologists Robert Boyd and Peter Richerson posit that large-scale cooperation within the human species-including with genetically unrelated individuals within a group-was favored by selection. (Hauser, 2006, p. 416) Evolution selected for the trait of empathy because there were survival benefits in coming to grips with others. In his book People of the Lake (1978), the world-renowned paleoanthropologist Richard Leakey unequivocally declares, “We are human because our ancestors learned to share their food and their skills in an honored network of obligation.”

Studies have shown that empathy is present in very young children, even at eighteen months of age and possibly younger. In the primate world, Warneken and colleagues at the Max Planck Institute at Leipzig, Germany, recently found that chimps extend help to unrelated chimps and unfamiliar humans, even when inconvenienced and regardless of any expectation of reward. This suggests that empathy may lie behind this natural tendency to help and that it was a factor in the social life of the common ancestor to chimpanzees and humans at the split some six million years ago (New Scientist, 2007; Warneken and Tomasello, 2006). It’s now indisputable that we share moral faculties with other species (de Waal, 2006; Trivers, 1971; Katz, 2000; Gintis, 2005; Hauser, 2006; Bekoff, 2007; Pierce, 2007). Pierce notes that there are “countless anecdotal accounts of elephants showing empathy toward sick and dying animals, both kin and non-kin (2007, p. 6). And recent research in Kenya has conclusively documented elephant’s open grieving/empathy for other dead elephants.

Mogil and his team at McGill University recently demonstrated that mice feel distress when they observe other mice experiencing pain. They tentatively concluded that the mice engaged visual cues to bring about this empathic response (Mogil, 2006; Ganguli, 2006). De Waal’s response to this study: “This is a highly significant finding and should open the eyes of people who think empathy is limited to our species.” (Carey, 2006)

Additionally, Grufman and other scientists at the National Institutes of Health have offered persuasive evidence that altruistic acts activate a primitive part of the brain, producing a pleasurable response (2007). And recent research by Koenigs and colleagues (2007) indicates that within the brain’s prefrontal cortex, the ventromedial prefrontal cortex or VMPC is required for emotions and moral judgment. Damage to the VMPC has been linked to psychopathic behavior and individuals with psychopathic tendencies present significant empathic impairment. (Blair, 2005, pp. 53-56)

A study by Miller (2001) and colleagues of the brain disorder frontotemporal dementia (FTD) is also instructive. FTD attacks the frontal lobes and anterior temporal lobes, the site of one’s sense of self. One early system of FTD is the loss of empathy and the brain wave activity of mirror neurons in individuals with autism reveals misfiring.

While there are reasons to remain skeptical (see below) about the progressive political implications flowing from this work, a body of impressive empirical evidence reveals that the roots of prosocial behavior, including moral sentiments like empathy, precede the evolution of culture. This work sustains Noam Chomsky’s visionary writing about a human moral instinct and his assertion that, while the principles of our moral nature have been poorly understood, “we can hardly doubt their existence or their central role in our intellectual and moral lives.” (Chomsky, 1971, n.p., 1988; 2005, p. 263)

In his influential book Mutual Aid (1972, p. 57; 1902), the Russian revolutionary anarchist, geographer, and naturalist Petr Kropotkin, maintained that “. . . under any circumstances sociability is the greatest advantage in the struggle for life. Those species which willingly abandon it are doomed to decay.” Special cooperation provided an evolutionary advantage, a “natural” strategy for survival.

Kropotkin readily acknowledged the role of competition, but he asserted that mutual aid was a “moral instinct” and “natural law.” Based on his extensive studies of the animal world, he believed that this predisposition toward helping one another-human sociality-was of “prehuman origin.” Killen and Cords, in a fittingly titled piece “Prince Kropotkin’s Ghost,” suggest that recent research in developmental psychology and primatology seems to vindicate Kropotkin’s century-old assertions (2002).

So where does this leave us? If morality is rooted in biology, in the raw material or building blocks for the evolution of its expression, we now have a pending fortuitous marriage of hard science and secular morality in the most profound sense. The technical details of the social neuroscientific analysis supporting these assertions lie outside this paper, but suffice it to note that progress is proceeding at an exponential pace, the new discoveries are persuasive (Iacoboni, 2008; Lamm, 2007; Jackson, 2006) and our understanding of empathy has increased dramatically in barely a decade.

That said, one of the most vexing problems that remains to be explained is why so little progress has been made in extending this empathic orientation to distant lives, to those outside certain in-group moral circles. That is, given a world rife with overt and structural violence, one is forced to explain why our deep-seated moral intuition doesn’t produce a more ameliorating effect, a more peaceful world. Iacoboni suggests this disjuncture is explained by massive belief systems, including political and religious ones, operating on the reflective and deliberate level. As de Waal reminds us, evolutionarily, empathy is the original starting point out of which sprang culture and language. But over time, the culture filters and influences how empathy evolves and is expressed. (de Waal, 2007, p. 50) These belief systems tend to override the automatic, pre-reflective, neurobiological traits that should bring people together. Iacoboni hypothesizes the presence of what he labels super mirror neurons in the frontal lobe area of the brain. These more complex, highly developed super mirror neurons may control the so-called lower-level or classic neurons. This research-arguably the apex of the cutting edge of neuroscience work today-is in the preliminary stages but further investigation might suggest how cognitive resistance works to sort, inhibit or otherwise modulate neurophysiological responses.

Hence a few cautionary notes are warranted. The first is that social context and triggering conditions are critical because, where there is conscious and massive elite manipulation, it becomes exceedingly difficult to get in touch with our moral faculties. Ervin Staub, a pioneering investigator in the field, acknowledges that even if empathy is rooted in nature, people will not act on it “. . . unless they have certain kinds of life experiences that shape their orientation toward other human beings and toward themselves (Staub, 2002, p. 222). As Jensen puts it, “The way we are educated and entertained keep us from knowing about or understanding the pain of others” (2002, 2008). Circumstances may preclude and overwhelm our perceptions, rendering us incapable of recognizing and giving expression to moral sentiments (Albert, n.d.; and also, Pinker, 2002). For example, the fear-mongering of artificially created scarcity may attenuate the empathic response.

The limitations placed on exposure to powerful images that might stir deep emotions within the American public is another. The recent destruction of CIA videotapes showing the torture of prisoners is one example. Landstuhle regional medical center in Germany, which routinely receives grotesquely maimed soldiers from Iraq, is off-limits for photos and reporters are closely monitored by military escorts. And we know the Pentagon forbids media photo coverage of the remains of soldiers departing from Ramstein Air Base in Germany or coffins returning to Dover, Delaware. (Tami Silco, who took the now-famous photo of 20 flag-draped coffins leaving Kuwait, lost her job.) Coverage of memorial services for the fallen are also forbidden even if the unit gives its approval.

Conversely, the virtually ubiquitous feedback loop of the towers falling on September 11 tended to create a feeling within the viewer that she was in fact falling, producing both identification with falling victims and a powerful sense of fear of “terrorism.” (Lakoff, 2001)

The second cautionary note is Hauser’s (2006) observation that proximity was undoubtedly a factor in the expression of empathy. In our evolutionary past an attachment to the larger human family was virtually incomprehensible and therefore the emotional connection was lacking. Joshua Greene, a philosopher and neuroscientist, adds that “We evolved in a world where people in trouble right in front of you existed, so our emotions were tuned to them, whereas we didn’t face the other kind of situation.” He suggests that to extend this immediate emotion-linked morality-one based on fundamental brain circuits-to unseen victims requires paying less attention to intuition and more to the cognitive dimension. If this boundary isn’t contrived, it would seem, at a minimum, circumstantial and thus worthy of reassessing morality (Greene, 2007, n.p.). Given some of the positive dimensions of globalization, the potential for identifying with the “stranger” has never been more auspicious.

But not in every case. Carlisle (2007) notes that through the use of technology (including long-range killing and new types of training) the military has attempted to desensitize and circumvent the natural empathic response most soldiers experience toward their opponents. She cautions that “. . . with less opportunity to mirror other human’s suffering that results in empathy, over time our capacity to empathize may disappear altogether.” For a careful study of human’s innate aversion to taking life and how the military has conditioned soldiers to overcome it-and the resulting psychological damage-the best treatment is Lt. Col. David Grossman’s On Killing (1996).

It may be helpful, as Halpern (1993, p. 169) suggests, to think of empathy as a sort of spark of natural curiosity, prompting a need for further understanding and deeper questioning. However, our understanding of how or whether political engagement follows remains in its infancy and considerable work remains to be done. Almost a century ago, Stein (1917) wrote about empathy as “the experience of foreign consciousness in general.” Salles’ film The Motorcycle Diaries addresses empathy, albeit indirectly. The film follows Ernesto Guevara de la Serna and his friend Alberto Granada on an eight-month trek across Argentina, Peru, Colombia, Chile and Venezuela.

When leaving his leafy, upper middle-class suburb (his father is an architect) in Buenos Aires in 1952, Guevara is 23 and one semester from earning his medical degree. The young men embark on an adventure, a last fling before settling down to careers and lives of privilege. They are preoccupied with women, fun and adventure and certainly not seeking or expecting a life-transforming odyssey.

The film’s power is in its depiction of Guevara’s emerging political awareness that occurs as a consequence of unfiltered cumulative experiences. During their 8,000-mile journey, they encounter massive poverty, exploitation, and brutal working conditions, all consequences of an unjust international economic order. By the end Guevara has turned away from being a doctor because medicine is limited to treating the symptoms of poverty. For him, revolution becomes the expression of empathy, the only effective way to address suffering’s root causes. This requires melding the cognitive component of empathy with engagement, with resistance against asymmetrical power, always an inherently political act. Otherwise, empathy has no meaning. [This roughly parallels the political practice of brahma-viharas by engaged Buddhists.] In his own oft-quoted words (not included in the film) Guevara stated that “The true revolutionary is guided by a great feeling of love.”

Paul Farmer, the contemporary medical anthropologist, infectious disease specialist and international public health activist, has adopted different tactics but his diagnosis of the “pathologies of power” is remarkably similar to Guevara. He also writes approvingly of Cuba’s health programs, comparing them with his long work experience in Haiti. Both individuals were motivated early on by the belief that artificial epidemics have their origin in unjust socioeconomic structures, hence the need for social medicine, a “politics as medicine on a grand scale.” Both viewed “politics as medicine on a grand scale” and committed themselves to acting on behalf of the poor. Both exemplify exceptional social outliers of engaged empathy and the interplay of affective, cognitive and moral components. For Farmer’s radical critique of structural violence and the connections between disease and social inequality, see (Farmer, 2003; Kidder, 2003). Again, it remains to be explained why there is such a paucity of real world examples of empathic behavior. Why is U.S. culture characterized by a massive empathy deficit of almost pathological proportions? And what might be reasonably expected from a wider public understanding of the nature of empathy?

Hauser posits a “universal moral grammar,” hardwired into our neural circuits via evolution; this neural machinery precedes conscious decisions in life-and-death situations. However, we observe “nurture entering the picture to set the parameters and guide us toward the acquisition of particular moral systems.” At other points he suggests that environmental factors can push individuals toward defective moral reasoning, and the various outcomes for a given local culture are virtually limitless. (Hauser, 2006) For me, this discussion of cultural variation fails to give sufficient attention to the socioeconomic variables responsible for shaping the culture. As Goldschmidt argues, “It all has to do with the quality of justice and the availability of opportunity” (2006, p. 151) Earlier, Goldschmidt (1999, n.p.) argued that, “Culturally derived motives may replace, supplement or override genetically programmed behavior.”

To reiterate, the neurophysiological data strongly suggests that morality is grounded in biology. As Greene contends, it’s not “handed down” from on high by religious authorities or philosophers but “handed up” as a consequence of the brain’s evolutionary processes. (Greene in Vedantam, 2007). However, as Rizzolatti and Craighero (2006) wisely remind us, “To use the mirror mechanism-a biological mechanism-strictly in a positive way, a further-cultural-addition is necessary.”

Neither a reductive biological explanation nor a culture-inevitably-trumps-nature argument is defensible. Instead, I’m comfortable with what the political theorist William Connolly (2002) describes as “. . . politics through which cultural life mixes into the composition of body/brain process. And vice versa.” (Connolly, to my knowledge the first person to employ the term neuropolitics, doesn’t explore the mirror neurons/politics of empathy link in his erudite inquiry.)

Recent work by Molnar-Szakacs and colleagues suggests that cultural stimuli imprint and influence certain neurobiological responses and subsequent behavior. Further, the culture and ethnicity of those conveying the messages seems to be a critical variable. Using transcranial magnetic stimulation (TMS) they found significant measurable difference in mirror neural activity in their subjects depending on whether the information provider shared the subject’s cultural/ethnic background. Molnar-Szakacs conclude, “Our data shows that both ethnicity and culture interact to influence activity in the brain, specifically within the mirror neuron network involved in social communication and interaction.” (Molnar-Szakacs, 2007; Preston, 2006; and in press). While one hesitates to draw any firm conclusions from this very preliminary research, further investigation of the links between culture and the encoding of mirror neurons is certainly warranted, not the least for its possibly profound political implications.

Here we return to our earlier question regarding the relative absence of widespread empathic responses within society. Cultures are rarely neutral, innocent phenomena but are consciously set up to reward some people and penalize others. As Parenti (2006) forcefully asserts, certain aspects of culture can function as instruments of social power and social domination through ideological indoctrination.

Culture is contested terrain and studying it can reveal how power is exercised and on whose behalf. Lakoff (2005) reminds us that in cognitive linguistics certain values like compassion are termed “contested concepts” because although a core meaning might be assumed, those holding a wildly different ideological commitment can appropriate and direct them toward other ends. The primer here is Gramsci’s (1971) classic analysis of cultural hegemony in which capitalism maintains domination, in part, through subtly but actively creating society’s prevailing cultural norms. This consensual control is achieved through mass media, education, religion and popular culture as subordinate classes assimilate certain ideas as “common sense.”

Cohen and Rogers, in parsing Chomsky’s critique of elites, note that “Once an unjust order exists, those benefitting from it have both an interest in maintaining it and, by virtue of their social advantages, the power to do so.” (Cohen, 1991, p. 17) (For a concise but not uncritical treatment of Chomsky’s social and ethical views, see Cohen, 1991.) Clearly, the vaunted human capacity for verbal communication cuts both ways. In the wrong hands, this capacity is often abused by consciously quelling the empathic response. When de Waal writes, “Animals are no moral philosophers,” I’m left to wonder if he isn’t favoring the former in this comparison. (de Waal, 1996b, n.p.)

One of the methods employed within capitalist democracies is Chomsky and Herman’s “manufacture of consent,” a form of highly sophisticated thought control. Potentially active citizens must be “distracted from their real interests and deliberately confused about the way the world works.” (Cohen, 1991, p. 7; Chomsky, 1988)

For this essay, and following Chomsky, I’m arguing that the human brain is the primary target of this perverse “nurture” or propaganda. In the context of this paper we might rephrase this as the human brain’s mirror neuron network is the target of this manufacturing of ignorance and indifference because exposure to certain new truths about empathy-hard evidence about our innate moral nature-poses a direct threat to elite interests. There’s no ghost in the machine, but the capitalist machine attempts to keep people in line with an ideological ghost, the notion of a self constructed on market values. But “. . . if no one saw himself or herself as capitalism needs them to do, their own self-respect would bar the system from exploiting and manipulating them.” (Kelleher, 2007) That is, given the apparent universality of this biological predisposition toward empathy, we have a potent scientific baseline upon which to launch further critiques of elite manipulation, this cultivation of callousness.

First, the evolutionary and biological origins of empathy contribute robust empirical evidence-not wishful thinking or even logical inference-on behalf of a case for organizing vastly better societies. In that vein, this new research is entirely consistent with work on the nature of authentic love and the concrete expression in that love in the form of care, effort, responsibility, courage and respect. As Eagleton reminds us, if others are also engaging in this behavior “. . . the result is a form of reciprocal service which provides the context for each self to flourish. The traditional name for this reciprocity is love.” Because reciprocity mandates equality and an end to exploitation and oppression, it follows that “a just, compassionate treatment of other people is on the grand scale of things one of the conditions for one’s own thriving.” And as social animals, when we act in this way we are realizing our natures “at their finest.” (2007, pp. 170, 159-150, and 173). (Allot (1992) provides an early account of the evolutionary history of love and its significance for human development and survival.)

Predatory urges, cruelty, barbarism and more are also aspects of our nature and have their evolutionary origins and neural correlates. As Chomsky has written, “If you see somebody beating a child to death, should you say, “Well, you know that’s human nature-which it is in fact: there certainly are conditions under which people will act just like that. To the extent the statement is true, and there is such an extent, it’s just not relevant: human nature also has the capacity to lead to selflessness, and cooperation, and sacrifice, and support, and solidarity, and tremendous courage, and lots of other things too.” (Chomsky, 2002, p. 356) The critical question is how to determine which will prevail, how to realize a form of global environment that enhances the opportunity for the empathic aspect of our nature to flourish.

I’ve noted elsewhere that Fromm’s classic, The Art of Loving, is a blistering indictment of the social and economic forces that deny us life’s most rewarding experience and “the only satisfying answer to the problem of human existence.” For Fromm, grasping how society shapes our human instincts, hence our behavior, is in turn the key to understanding why “love thy neighbor,” the love of the stranger, is so elusive in modern society.

The global capitalist culture with its premium on accumulation and profits not only devalues an empathic disposition but produces a stunted character where everything is transformed into a commodity, not only things, but individuals themselves. The very capacity to practice empathy (love) is subordinated to our state religion of the market in which each person seeks advantage in an alienating and endless commodity-greedy competition.

Over five decades ago, Fromm persuasively argued that “The principles of capitalist society and the principles of love are incompatible.” (Fromm, 1956, p. 110) Any honest person knows that the dominant features of capitalist society tend to produce individuals who are estranged from themselves, crippled personalities robbed of their humanity and in a constant struggle to express empathic love. Little wonder that Fromm believed radical changes in our social structure and economic institutions were needed if empathy/love is to be anything more than a rare individual achievement and a socially marginal phenomenon. He understood that only when the economic system serves women and men, rather than the opposite, will this be possible (Olson, 2006).

The dominant cultural narrative of hyper-individualism is challenged and the insidiously effective scapegoating of human nature that claims we are motivated by greedy, dog-eat-dog “individual self-interest is all” is undermined. From doctrines of original sin and Ayn Rand to mainstream economics and David Brooks (2007), certain interpretations of human nature have invariably functioned to retard class consciousness. These new research findings help to refute the allegation that people are naturally uncooperative, an argument frequently employed to intimidate and convince people that it’s futile to seek a better society for everyone. Stripped of yet another rationalization for empire, predatory behavior on behalf of the capitalist mode of production becomes ever more transparent. And learning about the conscious suppression of this essential core of our nature should beg additional troubling questions about the motives behind other elite-generated ideologies, from neo-liberalism to the “war on terror.”

Second, there are implications for students and teachers. Cultivating empathic engagement through education remains a poorly understood enterprise. College students, for example, may hear the ‘cry of the people’ but the moral sound waves are muted as they pass through a series of powerful cultural baffles. Williams (1986, p. 143) notes that “While they may be models of compassion and generosity to those in their immediate circles, many of our students today have a blind spot for their responsibilities in the socio-political order. In the traditional vocabulary they are strong on charity but weak on justice.”

Nussbaum (1997) defends American liberal education’s record at cultivating an empathic imagination. She claims that understanding the lives of strangers and achieving cosmopolitan global citizenship can be realized through the arts and literary humanities. There is little solid evidence to substantiate this optimism and my own take on empathy-enhancing practices within U.S. colleges and universities is considerably less sanguine. Nussbaum’s episodic examples of stepping into the mental shoes of other people are rarely accompanied by plausible answers as why these people may be lacking shoes-or decent jobs, minimum healthcare, and long-life expectancy. The space within educational settings has been egregiously underutilized, in part, because we don’t know enough about propitious interstices where critical pedagogy could make a difference. Arguably the most serious barrier is the cynical, even despairing doubt about the existence of a moral instinct for empathy. The new research puts this doubt to rest and rightly shifts the emphasis to strategies for cultivating empathy and identifying with “the other.” Joining the affective and cognitive dimensions of empathy may require risky forms of radical pedagogy (Olson, 2006, 2007a; Gallo, 1989). An intriguing implication is that the perceived character of the teacher being “mirrored” may be at least as important as the message being imparted. Evidence produced from a game situation with medical students strongly hints that empathic responses can be significantly enhanced by increased knowledge about the specific needs of others-in this case, the elderly (Varkey, 2006). Presumably, limited prior experiences would affect one’s emotional response. Again, this is a political culture/information acquisition issue that demands further study.

Third, for many people the basic incompatibility between global capitalism and the lived expression of moral sentiments may become obvious for the first time. (Olson, 2006, 2005) For example, the failure to engage this moral sentiment has radical implications, not the least being consequences for the planet. Within the next 100 years, one-half of all species now living will be extinct. Great apes, polar bears, tigers and elephants are all on the road to extinction due to rapacious growth, habitat destruction, and poaching. These human activities, not random extinction, will be the undoing of millions of years of evolution (Purvis, 2000). As Leakey puts it, “Whatever way you look at it, we’re destroying the Earth at a rate comparable with the impact of a giant asteroid slamming into the planet. . . .” And researchers at McGill University have shown that economic inequality is linked to high rates of biodiversity loss. The authors suggest that economic reforms may be the prerequisite to saving the richness of the ecosystem and urge that “. . . if we can learn to share the economic resources more fairly with fellow members of our own species, it may help to share ecological resources with our fellow species.” (Mikkelson, 2007, p. 5)

While one hesitates imputing too much transformative potential to this emotional capacity, there is nothing inconsistent about drawing more attention to inter-species empathy and eco-empathy. The latter may be essential for the protection of biotic communities. Decety and Lamm (2006, p. 4) remind us that “. . . one of the most striking aspects of human empathy is that it can be felt for virtually any target, even targets of a different species.”

This was foreshadowed at least fifty years ago when Paul Mattick, writing about Kropotkin’s notion of mutual aid, noted that “. . . For a long time, however, survival in the animal world has not depended upon the practice of either mutual aid or competition but has been determined by the decisions of men as to which species should live and thrive and which should be exterminated. . . .[W]herever man rules, the “laws of nature” with regard to animal life cease to exist.” This applies no less to humans and Mattick rightly observed that the demands of capital accumulation and capitalist social relations override and preclude mutual aid. As such, neuroscience findings are welcome and necessary but insufficient in themselves. For empathy to flourish requires the elimination of class relations (Mattick, 1956, pp. 2-3).

Fourth, equally alarming for elites, awareness of this reality contains the potential to encourage “destabilizing” but humanity-affirming cosmopolitan attitudes toward the faceless “other,” both here and abroad. In de Waal’s apt words, “Empathy can override every rule about how to treat others.” (de Waal, 2005, p. 9) Amin (2003), for example, proposes that the new Europe be reframed by an ethos of empathy and engagement with the stranger as its core value. The diminution of empathy within the culture reduces pro-social behavior and social cohesiveness. Given the dangerous centrifugal forces of ethno-nationalism and xenophobia, nothing less than this unifying motif will suffice, while providing space for a yet undefined Europe, a people to come.

Finally, as de Waal observes, “If we could manage to see people on other continents as part of us, drawing them into our circle of reciprocity and empathy, we would be building upon rather than going against our nature.” (de Waal, 2005, p. 9) An ethos of empathy is an essential part of what it means to be human and empathically impaired societies, societies that fail to gratify this need should be found wanting. We’ve been systematically denied a deeper and more fulfilling engagement with this moral sentiment. I would argue that the tremendous amount of deception and fraud expended on behalf of overriding empathy is a cause for hope and cautious optimism. Paradoxically, the relative absence of widespread empathic behavior is in fact a searing tribute to its potentially subversive power.

Is it too much to hope that we’re on the verge of discovering a scientifically based, Archimedean moral point from which to lever public discourse toward an appreciation of our true nature, which in turn might release powerful emancipatory forces?

Acknowledgement:A highly abbreviated version of this paper appeared at www.zmag.org (5/20/07) and portions at www.identitytheory.com (10/16/07). I wish to acknowledge helpful comments on earlier drafts by N. Chomsky, D. Dunn, M. Iacoboni, K. Kelly, S. Preston, and J. Wingard. Thanks, as always, to M. Ortiz.

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Gary Olson, Ph.D. chairs the Political Science Department at Moravian College in Bethlehem, PA. He may be reached at olson@moravian.edu.

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1 comment March 8th, 2008

Blast trauma may act at a distance

The new Science contains an important article on current thinking on traumatic brain injury (TBI) from bomb blasts:

Shell Shock Revisited: Solving the Puzzle of Blast Trauma

Even at a distance, explosions may cause lasting damage to the brain. Such findings could have big implications for arming and compensating troops

by Yudhijit Bhattacharjee

Working at the Military Hospital in Belgrade during the brutal Balkan war of the 1990s, neurologist Ibolja Cernak encountered a medical enigma. She saw soldier after soldier with memory deficits, dizziness, speech problems, and difficulties with decision-making–but no obvious injury. Cernak recalls one 19-year-old who went to a grocery store and began to weep after he couldn’t remember how to get back home. When his mother brought him to the hospital a few days later, Cernak learned what later emerged as a common element in all these cases: The soldier had survived an explosion on the battlefield.

The strange thing was that most of these patients had not suffered a direct injury to the head. And yet, in computed tomography and magnetic resonance imaging scans, Cernak saw signs of internal damage. In some cases, the brain’s ventricles–channels that carry cerebrospinal fluid– had become enlarged; and in some, there was evidence of minor bleeding.

But when Cernak dug into the medical literature for an explanation, she came up empty. According to the available research, shock waves from an explosion injure mainly air-filled organs such as the lung and the bowel, not the brain.

With a small band of collaborators in Belgrade, China, and Sweden, Cernak undertook animal studies that eventually confirmed that blast waves can cause neuronal damage. The work drew little attention until 2 years ago when hundreds of U.S. and British soldiers began returning from Iraq with symptoms similar to those of Cernak’s patients. As roadside explosions became more common, military doctors suspected that these symptoms were the likely result of mild traumatic brain injury (TBI) sustained in blasts. Seeing her observations borne out was as if “a myth had become reality,” says Cernak, who is now a researcher at the Applied Physics Laboratory at Johns Hopkins University in Baltimore, Maryland.

How blasts affect the brain has since become an urgent question in military medicine. Last summer, the U.S. Congress gave $150 million to the Department of Defense (DOD) for the first year of research on TBI– both severe injuries that damage the skull and milder ones suspected of causing neurological deficits. The Defense Advanced Research Projects Agency (DARPA) has already launched a $9 million research program aimed specifically at understanding trauma caused by shock waves, heat, and electromagnetic radiation emanating from blasts. Another $14 million a year is going to the Defense and Veterans Brain Injury Center (DVBIC), a DOD-funded agency headquartered in Washington, D.C., for research and outreach on TBI.

This flurry of interest has focused a spotlight on Cernak’s research. There is growing consensus that blasts can produce subtle injuries in the brain as suggested by Cernak several years ago. In fact, the Department of Veterans Affairs (VA) proposed a new rule this month acknowledging blast-related TBI as a special neurological condition whose symptoms may have gone undetected in the past. The proposed rule, published in the Federal Register on 3 January, would allow for greater disability compensation to victims than is granted currently.

But many researchers are skeptical of Cernak’s ideas about how these injuries might occur. Cernak postulates that blast waves ripple through the victim’s torso up into the brain through the major blood vessels, leading to neurological effects that can be slow to appear. Although she has evidence from animal experiments to back up that hypothesis, she admits that more research is needed. If the mechanism is confirmed by future studies, Cernak says, it would mean that helmets do not protect the brain against blast injury.

Besides raising questions about the protection of troops currently in combat, Cernak’s suggestion that simply being exposed to an explosion might lead to long-lasting brain damage has opened a Pandora’s box, particularly for veterans. It implies that some could be suffering from neurological deficits that went undiagnosed or were mistakenly attributed to posttraumatic stress disorder (PTSD). Indeed, since the government began putting out information about blast-related TBI, veterans have been trickling in to seek treatment for mental problems that some have lived with for decades. “It may well be that blast injuries follow the pattern of Agent Orange and Gulf War syndrome,” says former VA psychiatrist David Trudeau, referring to ill-defined health problems that have lingered for years after battle.

Hidden trauma

If Cernak had been a doctor during World War I, she says, she might well have recognized mild TBI among the thousands of soldiers who suffered from what was simply called “shell shock.” But during World War I, many doctors and military commanders viewed shell shock as a transient psychological phenomenon that affected soldiers who, in their opinion, were mentally weak.

Cernak discovered something very different: that soldiers’ mental problems seemed to be driven by enduring physical changes in the brain. To test her hypothesis, she conducted a study of 1300 patients who had suffered penetrating wounds to the lower body but not the head. More than half had suffered injuries in a blast; the rest had been wounded by projectiles. Many of the blast victims complained of symptoms such as insomnia, vertigo, and memory deficits, and more than 36% in this group showed irregular patterns of electrical activity in the brain–as measured by electroencephalograms taken within 3 days of the injury– compared to only 12% in the other group. A year later, 30% of blast- injured patients still showed abnormal brain activity compared to 4% of the rest. Cernak says the findings, published in the Journal of Trauma in 1999, suggested that the mental problems of blast victims had a biological basis.

Her study wasn’t the first to make that point. A year earlier, VA researchers had found that among veterans with PTSD, individuals with a history of blast exposure were much more likely than others to have abnormal brain activity as well as cognitive and behavioral problems.

“Our evidence pointed to the possibility that blast injury was a long- lasting injury in combat veterans,” says Trudeau, who retired in 2000. He says he was disappointed by the lack of follow-up to the study, published in the August 1998 Journal of Neuropsychiatry. “The reception we got was pretty lukewarm,” he says.

For decades, Army researchers had been studying the effects of blast waves but with a different focus. They concentrated on how to protect the lungs and bowel because the pressure from an explosion is most likely to shear at the interface of these tissues, where densities differ. DOD was so confident that advanced body armor was protecting troops against lung and bowel injuries that it closed down this research program in 2003. “We thought, why spend more money on this when we’ve fixed the problem?” says Geoffrey Ling, a neurologist and a program manager at DARPA.

Then the bad news arrived. As blast survivors from Iraq were air-lifted to hospitals, U.S. Army doctors, including Ling, who was deployed in Iraq in late 2004, began to see patients whose brains had swelled markedly within hours of being close to a blast. Some had clear head injuries but many did not. Even in cases involving visible wounds, the extent of swelling was often much greater than expected, leading neurosurgeons to wonder whether blast waves had played a role in addition to penetrating shrapnel. Ling says the patterns of vascular enlargement seen across a range of patients showed a continuum of brain injury, suggesting that there could be milder versions that were less obvious.

That suspicion has grown stronger with hundreds of soldiers returning from the war zone complaining of a common cluster of cognitive and behavioral problems. Army doctors say they have encountered many patients who are unable to perform simple addition and subtraction, read more than one sentence at a stretch, or recall simple things like what they had for lunch. “The majority are individuals who lost consciousness or were dazed after a blast but did not sustain overt head injuries,” says Ronald Riechers, a neurologist at Walter Reed Army Medical Center in Washington, D.C. “Within a short time frame, they develop headaches and notice that their reaction time and concentration are not the same as before.” Based on these evaluations, DVBIC estimates that 10% to 20% of all soldiers on duty in Iraq and Afghanistan have suffered some type of TBI.

Ling says the TBI numbers prompted DOD to restart its research on blast injury, this time with a focus on the brain. DARPA is funding two main projects as part of the first basic science effort on the topic. One will study the mechanical and cellular effects of blast waves in an animal model. Another will look at the consequences of repeated exposures to low-intensity explosions among military breachers, whose job is to blast holes into buildings using shoulder-launched weapons. “Once you know for certain what in a blast is really hurting the brain and how, you can use that to develop therapies and prevention strategies,” says Ling.

A tsunami in the brain

Although it is becoming accepted that blast waves can cause TBI, Cernak’s theory about how the damage occurs is controversial, and it has implications for how best to protect troops. She hypothesizes that when blast waves strike the body, they transfer kinetic energy and cause pressure in the main blood vessels to oscillate rapidly. A pulse travels up through the neck into the brain, damaging axonal fibers and neurons in the hippocampus, brainstem, and other structures close to cerebral vessels. The shock can also injure cells farther out in the cortical regions.

That mechanism is entirely different from the more widely studied effects of acceleration or deceleration in a car crash. Researchers know that a crash impact can shake the brain so violently that axonal fibers are torn. Some say victims of explosions could be experiencing a similar whiplashing, in contrast to Cernak’s view–which would mean that helmets designed to dampen that effect could help. “I am very skeptical that kinetic energy could be transferred through the vascular system,” says J. Clay Goodman, a neuropathologist at Baylor College of Medicine in Houston, Texas. “It is much more reasonable to consider the blast effects directly on the cranial vault and the brain.”

Cernak says her findings show the vascular route to be more plausible. In experiments that exposed rats and rabbits to a simulated blast wave in a shock tube–a cylinder through which an air pulse is transmitted at high velocity–Cernak and her colleagues found that immobilizing the animal’s head with steel plates to prevent whiplash effects did not protect against hippocampal cell damage, as they reported in the Journal of Trauma in 2001. Cernak says the vascular-transmission theory could explain the unique combination of symptoms in blast-induced TBI, as well as why neurological symptoms are seen in soldiers wearing helmets. For example, memory deficits hint at damage to the hippocampus, whereas problems in orientation reflect injuries to the cerebellum. “What’s happening in blast injury is that these inner structures are being affected,” Cernak says, in contrast to TBIs in traffic accidents and contact sports, where the cortex bears most of the brunt.

Cernak presented unpublished results last month at the Blast Injury Conference in Tampa, Florida, showing that exposure to blast waves can trigger neurodegeneration in rat brains, fragmenting the walls of neurons in the hippocampus and other regions. Similar findings have been published by Annette Saljo, a researcher at the University of Goteborg in Sweden and a collaborator of Cernak’s. Saljo and her colleagues reported in the Journal of Neurotrauma in August 2000 that rats exposed to blasts showed a buildup of neurofilament proteins in the cortex and the hippocampus during the week following the injury. This suggests that the damage can worsen over time, like a “slow cooking under the surface,” says Cernak: “One could think of it as a horribly accelerated aging of the brain.”

If blast waves indeed cause injury by vascular transmission, new types of body armor may be needed. “We would need to develop materials that completely absorb or reflect the full range of blast-wave frequencies generated by an explosion,” says Cernak, adding that current body armor only shields against some of a blast’s kinetic energy.

Cernak has done pioneering work, says John Povlishock, a neuroanatomist at Virginia Commonwealth University in Richmond, adding that she may be right that a “rapid rise and fall in venous pressure” is what stamps the blast’s signature on the brain. But more studies are needed to validate her ideas and translate the animal results into humans: “This is a topic with great economic, military, and social implications,” he says, “and as of now, the literature is extremely limited.”

Needed: A gold standard

As blast casualties from Iraq have mounted, the U.S. military has stepped up efforts to detect TBI among troops. In July 2006, the Army Surgeon General asked all unit commanders in Iraq to request TBI screening for soldiers displaying “poor marksmanship, delayed reaction times, decreased ability to concentrate, and inappropriate behavior.”
Troops who have been in a blast are evaluated by field medics using a short questionnaire that asks, among other things, if the person lost consciousness and had trouble remembering things from just before the explosion. Depending on the severity of the symptoms, they are asked to take a day off or see a neuropsychologist.

Some veterans groups believe a more aggressive screening policy is needed, especially because the symptoms of blast injury might not show up until later and because subtle injuries might not show up in standard brain scans. The ideal option, some say, would be to use a biomarker:

“We’d like to be able to do a blood test to determine the injury,” says Colonel Robert Labutta, a neurologist at the health affairs office at DOD. But until the science of blast injury is established, officials say, it does not make sense to bring home every soldier who has been in the vicinity of an explosion.

The costs of treating TBI victims from Iraq and Afghanistan could be astronomical. At last count, nearly 25,000 soldiers had been diagnosed with TBI. One estimate of the financial burden, calculated by Harvard researchers, puts the number at $14 billion over the next 20 years. But officials seem determined not to miss any cases among troops coming
home: In April, VA mandated TBI screening for all Iraq and Afghanistan veterans who come to VA hospitals for any services, even if it’s a dental exam.

The spotlight on mild TBI has drawn the attention of older combat veterans who were exposed to blasts but were never treated for neurological symptoms. Many were diagnosed with PTSD; some of the symptoms–such as depression, irritability, and attention deficit– overlap with those of mild TBI. These cases, some reaching back to the Vietnam War, could have significant legal and financial implications, says Edward Kim, a psychiatrist with Bristol-Myers Squibb in Plainsboro, New Jersey, and author of a recent report from the American Neuropsychiatric Association on the mental health effects of TBI. “I question whether DOD and the VA really want to open this can of worms,”
he says. For example, a veteran with Alzheimer’s disease could make a claim pointing to research showing that TBI increases the risk of developing Alzheimer’s disease.

Cernak says she has been receiving e-mails and phone calls from veterans thanking her for her research and seeking more information. Last month, she got a call from a 47-year-old woman who had served in the first Gulf War. The woman had been a teacher before she went to the combat zone, where she was exposed to repeated blasts. After she returned home, she had to stop teaching because she could not remember any facts. The story reminded Cernak why she had begun studying this obscure field 2 decades ago. “Soldiers anywhere are one of the most vulnerable populations in the world,” she says. “It is a moral obligation to help them.”

2 comments January 25th, 2008

Study finds liberal-conservative difference in brain functioning

The Los Angeles Times reports on a new study finding differences in brain function between liberals and conservatives. Using a classic experimental paradigm, they found that liberals were more open to new information, whereas conservatives were more likely to block potentially distracting information:

Study finds left-wing brain, right-wing brain

Even in humdrum nonpolitical decisions, liberals and conservatives literally think differently, researchers show.

By Denise Gellene, Los Angeles Times Staff Writer

Exploring the neurobiology of politics, scientists have found that liberals tolerate ambiguity and conflict better than conservatives because of how their brains work.

In a simple experiment reported today in the journal Nature Neuroscience, scientists at New York University and UCLA show that political orientation is related to differences in how the brain processes information.

Previous psychological studies have found that conservatives tend to be more structured and persistent in their judgments whereas liberals are more open to new experiences. The latest study found those traits are not confined to political situations but also influence everyday decisions.

The results show “there are two cognitive styles — a liberal style and a conservative style,” said UCLA neurologist Dr. Marco Iacoboni, who was not connected to the latest research.

Participants were college students whose politics ranged from “very liberal” to “very conservative.” They were instructed to tap a keyboard when an M appeared on a computer monitor and to refrain from tapping when they saw a W.

M appeared four times more frequently than W, conditioning participants to press a key in knee-jerk fashion whenever they saw a letter.

Each participant was wired to an electroencephalograph that recorded activity in the anterior cingulate cortex, the part of the brain that detects conflicts between a habitual tendency (pressing a key) and a more appropriate response (not pressing the key). Liberals had more brain activity and made fewer mistakes than conservatives when they saw a W, researchers said. Liberals and conservatives were equally accurate in recognizing M.

Researchers got the same results when they repeated the experiment in reverse, asking another set of participants to tap when a W appeared.

Frank J. Sulloway, a researcher at UC Berkeley’s Institute of Personality and Social Research who was not connected to the study, said the results “provided an elegant demonstration that individual differences on a conservative-liberal dimension are strongly related to brain activity.”

Analyzing the data, Sulloway said liberals were 4.9 times as likely as conservatives to show activity in the brain circuits that deal with conflicts, and 2.2 times as likely to score in the top half of the distribution for accuracy.

Sulloway said the results could explain why President Bush demonstrated a single-minded commitment to the Iraq war and why some people perceived Sen. John F. Kerry, the liberal Massachusetts Democrat who opposed Bush in the 2004 presidential race, as a “flip-flopper” for changing his mind about the conflict.

Based on the results, he said, liberals could be expected to more readily accept new social, scientific or religious ideas.

“There is ample data from the history of science showing that social and political liberals indeed do tend to support major revolutions in science,” said Sulloway, who has written about the history of science and has studied behavioral differences between conservatives and liberals.

Lead author David Amodio, an assistant professor of psychology at New York University, cautioned that the study looked at a narrow range of human behavior and that it would be a mistake to conclude that one political orientation was better. The tendency of conservatives to block distracting information could be a good thing depending on the situation, he said.

Political orientation, he noted, occurs along a spectrum, and positions on specific issues, such as taxes, are influenced by many factors, including education and wealth. Some liberals oppose higher taxes and some conservatives favor abortion rights.

Still, he acknowledged that a meeting of the minds between conservatives and liberals looked difficult given the study results.

“Does this mean liberals and conservatives are never going to agree?” Amodio asked. “Maybe it suggests one reason why they tend not to get along.”

Of course, this study does not, by itself, provide evidence on causality. It is possible that experience in considering alternative explanations may develop the brain regions dealing with new information.

4 comments September 10th, 2007

Air Force psychological operations interested in neurobiology of dread (anticipation of pain)

A study last year on the neurobiology of dread gives an idea of what our military Psychological Operations folks are paying attention to. A link on this Air Force Psychological Operations web site is to this article on a recent study on the neurobiology of dread: The Real Pain of Dread with this intrguing subtitle: According to brain-imaging studies, the anticipation of pain can be just as agonizing as the experience of it.

While this research appears to be benign in intention, having been funded by the National Institute on Drug Abuse, it sure is interesting that it is one of a very few research papers cited by the Air Force PSYOPS folks. After all, creating an anticipation of pain is a central element in the United States” psychological torture paradigm.

It also makes one wonder what the calls for increased neurobiological research into interrogation strategies may actually be about.

1 comment May 14th, 2007

Vertebrates and earthworm nervous systems share common origin

A new study examining the microstructure of the central nervous system (CNS) of earthworms suggests that they share the same evolutionary origin as do th CNS of vertebrates, in contrast to received wisdom:

Vertebrates have a spinal cord running along their backs, but insects and annelid worms such as earthworms, which have simple organs that barely resemble a brain, have clusters of nerves organized in a chain along their bellies. So biologists have long assumed these systems—key to ultimately putting a brain to use—arose independently, only after the split.

In the new study, researchers at the European Molecular Biology Laboratory [EMBL] in Heidelberg examined they embryos of a marine annelid worm called Platynereis dumerilii, which has a nervous system unchanged for eons. They documented the molecular fingerprints of the developing nerve cells.

“Our findings were overwhelming,” says study team member Alexandru Denes. “The molecular anatomy of the developing CNS [central nervous system ] turned out to be virtually the same in vertebrates and Platynereis. Corresponding regions give rise to neuron types with similar molecular fingerprints and these neurons also go on to form the same neural structures in annelid worm and vertebrates.”

“Such a complex arrangement could not have been invented twice throughout evolution , it must be the same system,” said Gáspár Jékely, another team member. “It looks like Platynereis and vertebrates have inherited the organization of their CNS from their remote common ancestors.”

Add comment April 22nd, 2007


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