Are we born with a moral grammar?

By now I've probably read at least 5 mixed (mainly positive) reviews of Mark Hauser's new book "Moral Minds," and the commentary on the book by Nicholas Wade in the 10/31/06 New York Times stirs me to mention it in a post.

Hauser suggests that we have a universal and innate capacity for developing moral rules analogous to our capacity to develop language in the presence of other humans. A more reserved review in an earlier New York Times Book Review Magazine by Richard Rorty raises some concerns: "The exuberant triumphalism of the prologue to “Moral Minds” leads the reader to expect that Hauser will lay out criteria for distinguishing parochial moral codes from universal principles, and will offer at least a tentative list of those principles. These expectations are not fulfilled......the reader is left guessing about how he proposes to distinguish morality not just from etiquette, but also from prudential calculation, mindless conformity to peer pressure and various other things. This makes it hard to figure out what exactly his moral module is supposed to do. It also makes it difficult to envisage experiments that would help us decide between his hypothesis and the view that all we need to internalize a moral code is general-purpose learning-from-experience circuitry — the same circuitry that lets us internalize, say, the rules of baseball."

A review by Bloom and Jarudi in Nature makes some further points: "Certain deep parallels between language and morality make Hauser's proposal worth taking seriously. ....In other regards, however, language seems very different from morality. For one thing, linguistic knowledge is distinct from emotion. You might be disgusted or outraged by what somebody says, but the principles that make sense of sentences are themselves entirely cold-blooded. Your eyes do not well with tears as you unconsciously determine the structural geometry of a verb phrase. By contrast — and Hauser wrestles with this throughout Moral Minds — even those who accept that some moral capacity is innate often see it as inextricably linked to emotion. Perhaps the universal core of morality is a set of emotional responses — disgust, shame, sympathy, guilt and so on — that are triggered by certain situations. This hypothesis is supported by clear demonstrations that, at least in some circumstances, emotion precedes intuition. ...A different concern is that languages are combinatorial symbolic systems. An English speaker, for example, knows perhaps hundreds of thousands of words, and also knows principles of syntax that dictate how these words combine with one another to form sentences. There are other combinatorial systems in human cognition, such as number and music, but it's not clear that morality is one of them. Even if it is distinct from emotion, moral knowledge might be better characterized as a small list of evolved rules, perhaps simple (such as a default prohibition against intentional harm), perhaps complex (such as some version of the doctrine of double effect), but still very different in character from linguistic knowledge."

Countering these reservations, from Wade's article: "Much of the present evidence for the moral grammar is indirect. Some of it comes from psychological tests of children, showing that they have an innate sense of fairness that starts to unfold at age 4. Some comes from ingenious dilemmas devised to show a subconscious moral judgment generator at work. These are known by the moral philosophers who developed them as “trolley problems." ...Suppose you are standing by a railroad track. Ahead, in a deep cutting from which no escape is possible, five people are walking on the track. You hear a train approaching. Beside you is a lever with which you can switch the train to a sidetrack. One person is walking on the sidetrack. Is it O.K. to pull the lever and save the five people, though one will die?...Most people say it is....Assume now you are on a bridge overlooking the track. Ahead, five people on the track are at risk. You can save them by throwing down a heavy object into the path of the approaching train. One is available beside you, in the form of a fat man. Is it O.K. to push him to save the five? Most people say no, although lives saved and lost are the same as in the first problem." (Note: Brain imagining experiments show the second scenario activates emotional areas of the brain that counter the more frontal rational areas engaged by the first scenario.).. "Why does the moral grammar generate such different judgments in apparently similar situations? It makes a distinction, Dr. Hauser writes, between a foreseen harm (the train killing the person on the track) and an intended harm (throwing the person in front of the train), despite the fact that the consequences are the same in either case. It also rates killing an animal as more acceptable than killing a person... Many people cannot articulate the foreseen/intended distinction, Dr. Hauser says, a sign that it is being made at inaccessible levels of the mind. This inability challenges the general belief that moral behavior is learned. For if people cannot articulate the foreseen/intended distinction, how can they teach it?"

This last point seems weak, all kinds of teaching occurs without articulation. Even given that some moral judgements can be more rapid than conscious thought, or are carried out by unconscious background processes, how do we design experiments to distinguish whether they are innate or learned? We need a paradigm as powerful that provided by the Nicaraguan school for deaf children, where the children invented among themselves a unique sign language following Chomsky's rules for a universal grammar. Would a group of children isolated from outside moral influence develop universal moral codes (an experiement that can't be done) or would we have the scenario of Golding's "The Lord of the Flies?"

Tony Auth and Tom Tooles on the resveratrol story

Self recognition - humans, apes, dolphins...and now elephants

Plotnik, de Waal, and Reiss report in PNAS that mirror self recognition (MSR), considered an indicator of self awareness, can be observed in Asian elephants. Slightly edited from their abstract: "MSR is thought to correlate with higher forms of empathy and altruistic behavior. Apart from humans and apes, dolphins and elephants are also known for such capacities. After the recent discovery of MSR in dolphins (Tursiops truncatus), elephants thus were the next logical candidate species. The authors exposed three Asian elephants (Elephas maximus) to a large mirror to investigate their responses. Animals that possess MSR typically progress through four stages of behavior when facing a mirror: (i) social responses, (ii) physical inspection (e.g., looking behind the mirror), (iii) repetitive mirror-testing behavior, and (iv) realization of seeing themselves. Visible marks and invisible sham-marks were applied to the elephants' heads to test whether they would pass the litmus "mark test" for MSR in which an individual spontaneously uses a mirror to touch an otherwise imperceptible mark on its own body. Here, we report a successful MSR elephant study and report striking parallels in the progression of responses to mirrors among apes, dolphins, and elephants. These parallels suggest convergent cognitive evolution most likely related to complex sociality and cooperation.


Above video (click the rectangle to play) was taken from the Elmo lipstick camera embedded in the mirror on Happy's first day of marking. Happy repetitively touches the mark or the area immediately around the mark with her trunk while in full view of the mirror. She never touches the sham-mark during this session.

Followup: take resveratrol and continue to pig out...

In my 10/31/06 post on caloric restriction I elected not to get into the resveratrol story, but followup articles in the NY Times and Nature now force me to do that (....added note: after writing this post I see the resveratrol story on the NBC Evening News with Brian Williams!) Experiments showing that resveratrol extends lifespan in lower animals have been extended now to mice. Several Biotec companies are testing improved versions of the compound.

Here's the abstract from the Nature article:

Resveratrol (3,5,4'-trihydroxystilbene) extends the lifespan of diverse species including Saccharomyces cerevisiae, Caenorhabditis elegans and Drosophila melanogaster. In these organisms, lifespan extension is dependent on Sir2, a conserved deacetylase proposed to underlie the beneficial effects of caloric restriction. Here we show that resveratrol shifts the physiology of middle-aged mice on a high-calorie diet towards that of mice on a standard diet and significantly increases their survival. Resveratrol produces changes associated with longer lifespan, including increased insulin sensitivity, reduced insulin-like growth factor-1 (IGF-I) levels, increased AMP-activated protein kinase (AMPK) and peroxisome proliferator-activated receptor- coactivator 1 (PGC-1) activity, increased mitochondrial number, and improved motor function. Parametric analysis of gene set enrichment revealed that resveratrol opposed the effects of the high-calorie diet in 144 out of 153 significantly altered pathways. These data show that improving general health in mammals using small molecules is an attainable goal, and point to new approaches for treating obesity-related disorders and diseases of ageing.

How emotions modulate memory through the amygdala

Transmission of sensory information through the rhinal cortices is essential for hippocampus-dependent learning. In Nature Neuroscience Quirk & Vidal-Gonzalez provide a nice summary of work by Paz. et. al. showing that amygdala activity elicited by an unexpected reward facilitates communication from perirhinal to entorhinal cortex, providing a physiological mechanism for emotional modulation of memory.


Figure: The amygdala enhances transfer of sensory information.
Sensory input flows from the neocortex to the hippocampus via the rhinal cortices (descending arrows). The hippocampus in turn assists in consolidating and storing this information through projections back to neocortex (ascending arrows). (a) During spontaneous activity, with low amygdala firing rates (blue traces on left), transfer of information from perirhinal cortex (Prh) to entorhinal cortex (Ent) is minimal (thin red arrows). (b) Following reward, the amygdala increases its firing rate and synchrony. This enables the transfer of sensory information through the rhinal cortices into the hippocampus (large red arrow).

Eat less, live longer, now shown for monkeys as well as mice and worms

Mason writes an interesting review in the New York Times 10/31/06 science section focusing on experiments at the University of Wisconsin Primate research center which have closely monitored rhesus monkeys on restricted and normal-calorie diets. Fifty animals survive from the original group of 76, the differences are just now becoming apparent in the older animals. Here are some edited clips from that article:

In a laboratory at the Wisconsin National Primate Research Center, Matthias, the monkey on the right, is learning about time’s caprice the hard way. At 28, getting on for a rhesus monkey, Matthias is losing his hair, lugging a paunch and getting a face full of wrinkles. Yet in the cage next to his, gleefully hooting at strangers, one of Matthias’s lab mates, Rudy, is the picture of monkey vitality, although he is slightly older. Thin and feisty, Rudy stops grooming his smooth coat just long enough to pirouette toward a proffered piece of fruit.

Those on normal diets, like Matthias, are beginning to show signs of advancing age similar to those seen in humans. Three of them, for instance, have developed diabetes, and a fourth has died of the disease. Five have died of cancer.

But Rudy and his colleagues on low-calorie meal plans are faring better. None have diabetes, and only three have died of cancer. It is too early to know if they will outlive their lab mates, but the dieters here and at the other labs also have lower blood pressure and lower blood levels of certain dangerous fats, glucose and insulin.

The suggestion from studies on mice and nematode worms is that animals stressted by caloric restriction activate numerous biochemical pathways that repair cell damage and suppress inflammatory reactions. In mice, calorie restriction doesn’t just extend life span, it also mitigates many diseases of aging: cancer, cardiovascular disease, neurodegenerative disease.

Researchers at Washington University in St. Louis have been tracking the health of small groups of calorie-restricted dieters. Earlier this year, they reported that the dieters had better-functioning hearts and fewer signs of inflammation, which is a precursor to clogged arteries, than similar subjects on regular diets.

In previous studies, people in calorie-restricted groups were shown to have lower levels of LDL, the so-called bad cholesterol, and triglycerides. They also showed higher levels of HDL, the so-called good cholesterol, virtually no arterial blockage, and remarkably low blood pressandure.

Some doubt that calorie restriction can ever work effectively in humans,and that it will make people miserable in the process of attempting it. A mathematical model published last year predicted that the maximum life span gain from calorie restriction for humans would be just 7 percent. A more likely figure, the authors said, was 2 percent.

Relationship between genetic variations in serotonin transporter, brain activity, and depression.

The effect of life stress on depression is moderated by a repeat length variation in the transcriptional control region of the serotonin transporter gene, which renders carriers of the short variant vulnerable for depression. Canli et al. have investigated the underlying neural mechanisms of these epigenetic processes in individuals with no history of psychopathology by using multimodal magnetic resonance-based imaging, genotyping, and self-reported life stress and rumination. Based on functional MRI and perfusion data, They found support for a model in which life stress interacts with the effect of serotonin transporter genotype on amygdala and hippocampal resting activation, two regions involved in depression and stress. Life stress also differentially affected, as a function of serotonin transporter genotype, functional connectivity of the amygdala and hippocampus with a wide network of other regions, as well as gray matter structural features, and affected individuals' level of rumination. They suggest that these interactions may constitute a neural mechanism for vulnerability toward, or protection against, depression.

How Google can nudge the keywords of political debate

There's a great piece "Own your own words" in the Oct. 30 Sunday New York Times Book Review Magazine written by Steven Johnson... on how Google is shifting the landscape of how word meanings are controlled in the political and social landscape. (The same Google I'm swearing at as I write this post, because its Blogger.com is making changes that that have blocked my ability to do posts for the last two days). Commenting and abstracting from Johnson:

Think of the battles that have erupted around terms like “liberal,” “torture,” “pro-life” or “intelligent design.” Now we are more likely to type these key words into Google and instantly get an entire field guide to their present usage: in op-ed columns, advertising blurbs, blog posts, MySpace pages, diaries, scholarly publications, wherever. Does “liberal,” for instance, evoke a big-government, tax-and-spend worldview that never met a bureaucrat it didn’t like? Or is it a tradition of egalitarian open-mindedness? Is “intelligent design” a legitimate scientific discipline, or a Trojan horse for anti-science religious values?

It is precisely this kind of real-world usage that Google lets you see in a single click, which creates a fascinating opportunity for anyone with a vested interest in shaping the popular meaning of words. Johnson suggests a simply strategy for increasing the prominence of your views. Because Google considers links to be a kind of vote endorsing the content of a given page, if you created a specific page, for example, called “affirmative action” — where your various articles and thoughts were collected — and encouraged others to link to that page, you could very quickly “own” affirmative action in Google. Johnson tries this approach with a proper name, by making the title of one of his blog posts the name of the British cultural critic "Raymond Williams." He deliberately titled the page “Raymond Williams” to persuade Google to rank the page highly for people searching using the key words “Raymond Williams.” After it went online, a few other bloggers linked to the page. Within two weeks, if you searched Google using the key word “Raymond Williams,” his little riff showed up as the No. 6 result, behind a Wikipedia entry, a museum bio and a few scholarly papers.

What’s powerful about this strategy is not the sheer number of readers, but the kind of readers he is attracting. By writing a little blog post and seeding it in such a way that it attracts Google searches, he attracts thousands of people who by definition are interested in the question of what Raymond Williams means. By positioning his work so that it will align itself with Google’s vast “database of intentions” — to borrow the memorable phrase coined by the technology writer John Battelle — He gets his meaning in front of the very people who are actively seeking it out.

This strategy happens to be old news to the bottom-feeders of the digital world: the spam artists who have long hacked the Google database to ensure that their sites rank highly when people search for “sex” and “blackjack” and “cheap Canadian meds.” But just because the spammers got there first doesn’t mean that Google-centric positioning cheapens the work of intellectuals. Johnson suggests that it’s inevitable that intellectuals who are interested in speaking to a wider audience will orient their work around Google’s rising influence. That doesn’t mean scholarly publications are irrelevant in this new world: the physicists don’t stop talking to one another simply because most people have a watered down version ofrelativity in their heads. It just means that for the mainstream understanding of complex issues, Google (and Wikipedia, whose entries often rank near the top of Google searches) are quickly becoming central authorities. So the question is whether intellectuals are going to mope about this shift — or whether they’ll see it as an opportunity to shape popular opinion.And if they make that shift, they’ll take their cues from the spammers and charlatans, the drug pushers and the pornographers. They’ll realize that it’s not just the marketplace of ideas they should be worried about. It’s also the database.

Hereditary family signature of facial expression

Facial expressions of emotions are universal, but individual differences create a facial expression "signature" for each person. Pelig et al have examined whether there might be a unique family facial expression signature. Using two types of analyses, they show a correlation between movements of congenitally blind subjects with those of their relatives in think-concentrate, sadness, anger, disgust, joy, and surprise and provide evidence for a unique family facial expression signature. In the analysis "in-out family test," a particular movement was compared each time across subjects. Results show that the frequency of occurrence of a movement of a congenitally blind subject in his family is significantly higher than that outside of his family in think-concentrate, sadness, and anger. In the analysis "the classification test," in which congenitally blind subjects were classified to their families according to the gestalt of movements, results show 80% correct classification over the entire interview and 75% in anger. Analysis of the movements' frequencies in anger revealed a correlation between the movements' frequencies of congenitally blind individuals and those of their relatives. Pelig suggest that their study anticipates discovering genes that influence facial expressions, understanding their evolutionary significance, and elucidating repair mechanisms for syndromes lacking facial expression, such as autism.


Figure: Similar movements, described in detail in Table 2 of the paper, in born-blind participants (Left) and their sighted relatives (Right). Rows 1 and 2 show typical movements of the lips while the lips touch each other (as if chewing). Row 3 shows raising the right eyebrow only. Row 4 shows biting the lower lip while the mouth shows left asymmetry. Row 5 shows rolling the upper lip inside. In row 6 a "U" shape is created in the area between the lower lip and the chin. The chin is stretched and goes forward. The edges of the mouth are embedded and the lower lip is stretched. In row 7 the tongue protrudes and touches both lips.

Mirroring Minds (A talk I gave at Univ. Wisc. on 10/24)

An eclectic group of people gathers on Tuesday noon every week at the "Chaos and Complexity" seminar organized by Clint Sprott of the University of Wisconsin Madison Physics Department and Robin Chapman, a developmental psychologist and poet. They asked me to give a talk for that group and this is a link to a minimally edited version: Mirroring Minds: Are Mirror Neuron Systems the DNA of Psychology or a Red Herring? The web essays on my wesite "The I Illusion" and "The Beast Within" are previous talks I have given to this group. I had hoped to get as satisfying a bottom line on the "social brain" as I felt was obtained in those earlier talks, but it didn't really happen. Still, people were very positive about the talk and the discussion was excellent, so I decided to give you the above link to it.

The God Delusion

This is the title of a new book by Richard Dawkins, reviewed by Jim Holt in the Oct 22 New York Times. Abstracting from that review:

"Dawkins’s case against religion follows an outline that goes back to Bertrand Russell’s classic 1927 essay “Why I Am Not a Christian.” First, discredit the traditional reasons for supposing that God exists. (“God” is here taken to denote the Judeo-Christian deity, presumed to be eternal, all-powerful, all-good and the creator of the world.) Second, produce an argument or two supporting the contrary hypothesis, that God does not exist. Third, cast doubt on the transcendent origins of religion by showing that it has a purely natural explanation. Finally, show that we can have happy and meaningful lives without worshiping a deity, and that religion, far from being a necessary prop for morality, actually produces more evil than good. The first three steps are meant to undermine the truth of religion; the last goes to its pragmatic value."



"If God is indeed more complex and improbable than his creation, does that rule him out as a valid explanation for the universe? The beauty of Darwinian evolution, as Dawkins never tires of observing, is that it shows how the simple can give rise to the complex. But not all scientific explanation follows this model. In physics, for example, the law of entropy implies that, for the universe as a whole, order always gives way to disorder; thus, if you want to explain the present state of the universe in terms of the past, you are pretty much stuck with explaining the probable (messy) in terms of the improbable (neat). It is far from clear which explanatory model makes sense for the deepest question, the one that, Dawkins complains, his theologian friends keep harping on: why does the universe exist at all? Darwinian processes can take you from simple to complex, but they can’t take you from Nothing to Something. If there is an ultimate explanation for our contingent and perishable world, it would seemingly have to appeal to something that is both necessary and imperishable, which one might label “God.” Of course, it can’t be known for sure that there is such an explanation. Perhaps, as Russell thought, “the universe is just there, and that’s all.”

"This sort of coolly speculative thinking could not be more remote from the rococo rituals of religion as it is actually practiced across the world. Why is it that all human cultures have religion if, as Dawkins believes he has proved, it rests on a delusion? Many thinkers — Marx, Freud, Durkheim — have produced natural histories of religion, arguing that it arose to serve some social or psychological function, such as, in Freud’s account, the fulfillment of repressed wishes toward a father-figure.

"Dawkins’s own attempt at a natural history is Darwinian, but not in the way you might expect. He is skeptical that religion has any survival value, contending that its cost in blood and guilt outweighs any conceivable benefits. Instead, he attributes religion to a “misfiring” of something else that is adaptively useful; namely, a child’s evolved tendency to believe its parents. Religious ideas, he thinks, are viruslike “memes” that multiply by infecting the gullible brains of children. (Dawkins coined the term “meme” three decades ago to refer to bits of culture that, he holds, reproduce and compete the way genes do.) Each religion, as he sees it, is a complex of mutually compatible memes that has managed to survive a process of natural selection. (“Perhaps,” he writes in his usual provocative vein, “Islam is analogous to a carnivorous gene complex, Buddhism to a herbivorous one.”) Religious beliefs, on this view, benefit neither us nor our genes; they benefit themselves. "

"But the objectivity of ethics is undermined by Dawkins’s logic just as surely as religion is. The evolutionary biologist E. O. Wilson, in a 1985 paper written with the philosopher Michael Ruse, put the point starkly: ethics “is an illusion fobbed off on us by our genes to get us to cooperate,” and “the way our biology enforces its ends is by making us think that there is an objective higher code to which we are all subject.” In reducing ideas to “memes” that propagate by various kinds of “misfiring,” Dawkins is, willy-nilly, courting what some have called Darwinian nihilism."

"He is also hasty in dismissing the practical benefits of religion. Surveys have shown that religious people live longer (probably because they have healthier lifestyles) and feel happier (perhaps owing to the social support they get from church). Judging from birthrate patterns in the United States and Europe, they also seem to be outbreeding secular types, a definite Darwinian advantage. On the other hand, Dawkins is probably right when he says that believers are no better than atheists when it comes to behaving ethically. One classic study showed that “Jesus people” were just as likely to cheat on tests as atheists and no more likely to do altruistic volunteer work. "

"Special K" not just a party drug

The club drug K may be useful for something besides the psychedelic high of going "down the K-hole." A brief review by Check in Nature summarizes evidence that Ketamine, which works on NMDA glutamate receptors, may find a legitimate use as an antidepressant. A recent article by Zarate et al. shows that robust and rapid antidepressant effects result from a single intravenous dose of ketamine (0.5 mg/kg); onset occurrs within 2 hours postinfusion and continues to remain significant for 1 week.

Plasticity of gender difference in math performance

My Sept. 11 post mentioned studies of how construals can influence performance. Another example comes now from Dar-Nimrod and Heine, who manipulated participants' beliefs regarding the source of gender differences in math and measured their subsequent math performance (see figure). In study 1 (7), women undertook a Graduate Record Exam–like test in which they completed two math sections separated by a verbal section. The verbal section contained the manipulation in the form of reading comprehension essays. Each test condition used a different essay. Two of the essays argued that math-related sex differences were due to either genetic (G) or experiential causes (E). Both essays claimed that there are sex differences in math performance of the same magnitude. Two additional essays served as a traditional test of stereotype threat. One essay, designed to eliminate underperformance, argued that there are no math-related gender differences (ND). The other essay, designed as a standard stereotype-threat manipulation (S), primed sex without addressing the math stereotype. Controlling for performance on the first math section, they used analyses of covariance to demonstrate that women in the G and the S conditions exhibited similar performances on the second math test. Women in the E and the ND conditions, although not different from each other, significantly outperformed women in G and S conditions).



Click to enlarge figure. Legend: (Left) Study 1 results (133 women). Scores on second math test (controlling for scores on first test) after reading essays. (Right) Study 2 results (92 women), used a slightly different protocol (see methods)

These studies demonstrate that stereotype threat in women's math performance can be reduced, if not eliminated, when women are presented with experiential accounts of the origins of stereotypes. People appear to habitually think of some sex differences in genetic terms unless they are explicitly provided with alternative experiential arguments.

Imaging the brain during the motivated reasoning of political bias

Westen et al. report studies using functional neuroimaging to study the neural responses of 30 committed partisans during the U.S. Presidential election of 2004. They presented subjects with reasoning tasks involving judgments about information threatening to their own candidate, the opposing candidate, or neutral control targets. Motivated reasoning was associated with activations of the ventromedial prefrontal cortex, anterior cingulate cortex, posterior cingulate cortex, insular cortex, and lateral orbital cortex. As predicted, motivated reasoning was not associated with neural activity in regions previously linked to cold reasoning tasks and conscious (explicit) emotion regulation. The findings provide the neuroimaging evidence for phenomena variously described as motivated reasoning, implicit emotion regulation, and psychological defense. They suggest that motivated reasoning is qualitatively distinct from reasoning when people do not have a strong emotional stake in the conclusions reached.


Figure legend - Subjects' ratings of perceived contradictions in statements by Bush, Kerry, and neutral figures (higher ratings indicate greater perceived contradictions). Democrats and Republicans reasoned to distinctly different conclusions about their preferred candidates, with mirror-image responses: Democrats readily identified the contradictions in Bush's statements but not Kerry's, whereas Republicans readily identified the contradictions in Kerry's statements but not Bush's. In contrast, Democrats and Republicans reasoned similarly about the contradictions of politically neutral figures.


One of several figures showing imaging data - Three orthogonal views (axial, sagittal, coronal) of the areas of activation that differed when subjects were confronted with contradictory (threatening) information regarding their own party's candidate versus a neutral target person. ACC = anterior cingulate; mPFC = medial prefrontal cortex; pCING = posterior cingulate; PCU = precuneus; vmPFC = ventromedial prefrontal cortex.

Human fronto–mesolimbic networks guide decisions about charitable donation

Humans often sacrifice material benefits to endorse or to oppose societal causes based on moral beliefs. Charitable donation behavior, which has been the target of recent experimental economics studies, is an outstanding contemporary manifestation of this ability. Yet the neural bases of this unique aspect of human altruism, which extends beyond interpersonal interactions, remain obscure. Moll et al. have used functional magnetic resonance imaging while participants anonymously donated to or opposed real charitable organizations related to major societal causes. They show that the mesolimbic reward system is engaged by donations in the same way as when monetary rewards are obtained.
Furthermore, medial orbitofrontal–subgenual and lateral orbitofrontal areas, which also play key roles in more primitive mechanisms of social attachment and aversion, specificalculy mediate decisions to donate or to oppose societal causes. More anterior sectors of the prefrontal cortex are distinctively recruited when altruistic choices prevail over selfish material interests.


Figure - Brain responses for monetary reward and donation. (a) Mesolimbic–striatal reward system, including the VTA and the dorsal and ventral sectors of the striatum (STR), activation for both pure monetary reward and noncostly donation (conjunction of pure reward vs. baseline and noncostly donation vs. baseline). (b) Subgenual area (SG) activation for decisions to donate (conjunction of costly and noncostly conditions) as compared with pure monetary reward.


Figure - Brain responses for opposition and costly decisions. (a) lOFC responses to decisions to oppose causes as compared with decisions involving pure monetary reward (conjunction of costly and noncostly conditions). (b) Comparison of costly decisions (sacrificing money either to donate or to oppose causes) to pure monetary rewards. Effects were observed in the anterior prefrontal cortex (aPFC), including the frontopolar cortex and the medial frontal gyrus (BA 10/11/32), and in the dorsal anterior cingulate cortex (dACC).

Early exposure to novelty enhances social, cognitive, and neuroendocrine development

An interesting article in the latest PNAS from the University of New Mexico and McEwen's laboratory at Rockefeller.... I can't say it any better than the (slightly edited) abstract does:

Mildly stressful early life experiences can potentially impact a broad range of social, cognitive, and physiological functions in humans, nonhuman primates, and rodents. Recent rodent studies favor a maternal-mediation hypothesis that considers maternal-care differences induced by neonatal stimulation as the cause of individual differences in offspring development. Using neonatal novelty exposure, a neonatal stimulation paradigm that dissociates maternal individual differences from a direct stimulation effect on the offspring, Tang et al. investigated the effect of early exposures to novelty on a diverse range of psychological functions using several assessment paradigms. Pups that received brief neonatal novelty exposures away from the home environment showed enhancement in spatial working memory, social competition, and corticosterone response to surprise during adulthood compared with their home-staying siblings. These functional enhancements in novelty-exposed rats occurred despite evidence that maternal care was directed preferentially toward home-staying instead of novelty-exposed pups, indicating that greater maternal care is neither necessary nor sufficient for these early stimulation-induced functional enhancements. The authors suggest a unifying maternal-modulation hypothesis, which distinguishes itself from the maternal-mediation hypothesis in that (i) neonatal stimulation can have direct effects on pups, cumulatively leading to long-term improvement in adult offspring; and (ii) maternal behavior can attenuate or potentiate these effects, thereby decreasing or increasing this long-term functional improvement.

Your Brain on Humor...an fMRI study

A popular psychological model suggests that humor involves detection and resolution of incongruity. Incongruity is generated when a prediction is not confirmed in the final part of a story. To comprehend humor, it is necessary to revisit the story, transforming an incongruous situation into a funny, congruous one. Bartolo et al. used cartoon pairs to elicit humor without language processing because previous studies involving verbal humor had been difficult to interpret.

Here is the cartoon pair:



They found activation of both the left and the right hemispheres when comparing funny versus nonfunny cartoons. In particular, as shown in Part A of the figure below, they found activation of the right inferior frontal gyrus (Brodman area 47, BA 47), the left superior temporal gyrus (BA 38), the left middle temporal gyrus (BA 21), and the left cerebellum. These areas had previously been implicated in a nonverbal task exploring attribution of intention. They suggest that the resolution of incongruity might occur through a process of intention attribution. Bartolo et al. also asked subjects to rate the funniness of each cartoon pair. A parametric analysis of Brain areas activated during humor appreciation (Part B of figure below)showed that the left amygdala (the small dot in center of the top two pictures in part B) was activated in relation to subjective amusement, suggesting a key role for the amygdala in giving humor an emotional dimension.

A genetic change in brain growth factor alters anxiety behavior in mice (and humans?)

Brain derived neurotrophic factor (BDNF) regulates neuronal survival, differentiation, and synaptic plasticity. There has been speculation that its genetic alteration might contribute to affective and anxiety disorders. A report by Chen et al. in the Oct. 6 issue of Science now shows that a genetic mutation in humans that changes a single amino acid (valine to methionine) in BDNT can be reproduced in transgenic mice. Transgenic mice heterozygous for the Met allele, like humans, have smaller hippocampal volumes and perform poorly on hippocampal-dependent memory tasks.

Subsequent analyses of these mice elucidated a phenotype that had not been established in human carriers: increased anxiety. When placed in conflict settings, transgenic mice homozygous for the Met allele displayed increased anxiety-related behaviors in three separate tests, suggesting a genetic link between BDNF and anxiety. Some genetic association studies in humans have found that the Met allele has been associated with increased trait anxiety, but other studies have not replicated these findings. The anxiety-related phenotype may have been easier to observe in mice for two reasons: First, mice were subjected to conflict tests to elicit the increased anxiety-related behavior, whereas human studies relied on questionnaires. Second, the anxiety-related phenotype was only present in mice homozygous for the Met allele, which suggested that association studies that focused primarily on humans heterozygous for the Met allele may not detect an association. In this context, another human genetic polymorphism in the serotonin transporter (5HTLPR) is associated with depression only in homozygote subjects with past trauma histories.

A neural network that shares a common genetic origin with human intelligence.

Pol et al. have explored the genetic influence on focal gray matter (GM, nerve cell bodies) and white matter (WM, myelin covered axon tracts) densities in magnetic resonance brain images of 54 monozygotic and 58 dizygotic twin pairs and 34 of their siblings. To explore the common genetic origin of focal GM and WM areas with intelligence, they obtained cross-trait/cross-twin correlations in which the focal GM and WM densities of each twin are correlated with the psychometric intelligence quotient of his/her cotwin. They found genes to significantly influence WM density of the superior occipitofrontal fascicle, corpus callosum, optic radiation, and corticospinal tract, as well as GM density of the medial frontal, superior frontal, superior temporal, occipital, postcentral, posterior cingulate, and parahippocampal cortices. Moreover, their results showed that verbal (VIQ) and nonverbal (performance) (PIQ) intelligence quotient share a common genetic origin with an anatomical neural network involving the frontal, occipital, and parahippocampal GM and connecting GM of the superior occipitofrontal fascicle, and corpus callosum.



Figure legend: Cross-trait/cross-twin correlations for GM and WM density and VIQ/PIQ in MZ and DZ twin pairs ranging from 0 to 0.5. The cross-trait/cross-twin correlations were significant for GM density with VIQ in the right parahippocampal gyrus and for WM density with PIQ in the right superior occipitofrontal fascicle. A significant cross-trait/cross-twin correlation indicates that the genes influencing GM and WM density partly overlap with the genes that influence VIQ/PIQ. Note that, for illustration purposes, positive cross-correlations as shown here were not thresholded for significance. By definition, the cross-correlations in voxels that were not significantly determined by genetic factors could not become significant (because both factors, i.e., GM and WM density and VIQ and PIQ measures, have to be determined by genes to allow for inferences that possible mutual genes determine that association). Negative cross-correlations (data not shown) were present, but none of these reached significance.

An Elephant "Speaks"......

I wanted to pass on this curious bit from the Oct. 6 issue of Science Magazine:

A couple of years ago, an elephant trainer at South Korea's zoo in Everland Resort outside Seoul thought he heard a human voice coming out of an elephant stall. The sounds turned out to be coming from one of his charges, Kosik.

Putting the end of his trunk into his mouth, the 15-year-old Indian elephant can say short words such as bal (foot), joa (good), and anja (sit). Elephants normally make sounds through their trunks, without using their mouths. Scientists believe that Kosik blows air out of his trunk, modifying its flow by aiming at different places in his mouth and thereby generating sounds through friction with molars, inner tusks, and tongue.

Zoo veterinarians and engineers from Soongsil University in Seoul have conducted tests with Kosik. The acoustical properties of the sounds he makes are similar to those of sounds made by his trainer, Jong Gap Kim. In effect, the scientists say, Kosik is acting like a parrot. Scientists plan to conduct further studies to find out how Kosik came to mimic his trainer. Veterinarian Yang Bum Kim says elephants, who are about as smart as human toddlers, are very group-oriented and tend to copy those closest to them, suggesting that Kosik has a strong bond with trainer Kim. Kosik's parroting is not the first case of elephant mimicry. Last year, Nature published a paper on an African elephant that made "rumbling" sounds like a truck.