Insensitivity to social reputation in autism.

Further characterization of how social cognition is changed by the autism disorder - evidence for distinctive brain systems that mediate the effects of social reputation:

People act more prosocially when they know they are watched by others, an everyday observation borne out by studies from behavioral economics, social psychology, and cognitive neuroscience. This effect is thought to be mediated by the incentive to improve one's social reputation, a specific and possibly uniquely human motivation that depends on our ability to represent what other people think of us. Here we tested the hypothesis that social reputation effects are selectively impaired in autism, a developmental disorder characterized in part by impairments in reciprocal social interactions but whose underlying cognitive causes remain elusive. When asked to make real charitable donations in the presence or absence of an observer, matched healthy controls donated significantly more in the observer's presence than absence, replicating prior work. By contrast, people with high-functioning autism were not influenced by the presence of an observer at all in this task. However, both groups performed significantly better on a continuous performance task in the presence of an observer, suggesting intact general social facilitation in autism. The results argue that people with autism lack the ability to take into consideration what others think of them and provide further support for specialized neural systems mediating the effects of social reputation.

Our resting brain networks can be formed by multiple architectures.

There has been a lot of interest lately (see Jonah's Lehrer's nice summary) in the resting, default, or 'mind wandering' state of our brains. It recruits functional networks with rich endogenous dynamics which typically distributed over both cerebral cortices. An interdisciplinary collaboration involving Ralph Adolphs, whose experiments were carried out by Michael Tyszka, asked the question of whether these resting states, as one might suppose, require the presence of the corpus callosum, the large bundle of fibers connecting the two hemispheres. What they found is that a normal complement of resting-state networks and intact functional coupling between the hemispheres can emerge in the absence of the corpus callosum, suggesting that resting brain networks can be formed by multiple architectures. Their abstract:

Temporal correlations between different brain regions in the resting-state BOLD signal are thought to reflect intrinsic functional brain connectivity. The functional networks identified are typically bilaterally distributed across the cerebral hemispheres, show similarity to known white matter connections, and are seen even in anesthetized monkeys. Yet it remains unclear how they arise. Here we tested two distinct possibilities: (1) functional networks arise largely from structural connectivity constraints, and generally require direct interactions between functionally coupled regions mediated by white-matter tracts; and (2) functional networks emerge flexibly with the development of normal cognition and behavior and can be realized in multiple structural architectures. We conducted resting-state fMRI in eight adult humans with complete agenesis of the corpus callosum (AgCC) and normal intelligence, and compared their data to those from eight healthy matched controls. We performed three main analyses: anatomical region-of-interest-based correlations to test homotopic functional connectivity, independent component analysis (ICA) to reveal functional networks with a data-driven approach, and ICA-based interhemispheric correlation analysis. Both groups showed equivalently strong homotopic BOLD correlation. Surprisingly, almost all of the group-level independent components identified in controls were observed in AgCC and were predominantly bilaterally symmetric. The results argue that a normal complement of resting-state networks and intact functional coupling between the hemispheres can emerge in the absence of the corpus callosum, favoring the second over the first possibility listed above.

When it's an error to mirror...

Mimicry and imitation can facilitate cultural learning, maintenance of culture, and group cohesion, and individuals must competently select the appropriate models and actions to imitate. Mimicry and imitation also play an important role in dyadic social interactions. People mimic their partners’ mannerisms, which increases rapport and the partners’ liking of the mimickersA collaboration between psychologists and philosophers at the Univ. of California, San Diego asks whether and how mimicry unconsciously influences evaluations made by third-party observers of dyadic interactions. Their results indicate that third-party observers make judgments about individuals’ competence on the basis of their decisions concerning whether and whom to mimic. Contrary to the notion that mimicry is uniformly beneficial to the mimicker, people who mimicked an unfriendly model were rated as less competent than nonmimics. Thus, a positive reputation depends not only on the ability to mimic, but also on the ability to discriminate when not to mimic. Here is their experimental setup (click on figure to enlarge):

Figure: Illustration of the experimental paradigm and experimental results. Subjects watched two videos, in each of which an interviewer (model) interacted with an interviewee. After each video, subjects rated the interviewee’s competence, trustworthiness, and likeability. For each subject, one video showed a mimicking interviewee, and the other showed a nonmimicking interviewee. In Experiment 1, video frames were uncropped, so subjects could see the interviewer; in Experiment 2, video frames were cropped, so subjects could not see the interviewer, and mimicry was obscured. The interviewer’s attitude varied between subjects; some subjects saw videos with a cordial interviewer, and other subjects saw videos with a condescending interviewer. The graph shows the difference in average competence ratings between the cordial- and condescending-model conditions as a function of whether or not the interviewee mimicked the interviewer, separately for Experiments 1 and 2. Error bars represent standard errors of the difference between conditions.

Booze and our brains.

This is all I needed!..... yet another reason to chill on my happy hour Martini. I keep reminding myself that, in addition to yielding a pleasant ‘buzz’, a modest amount of alcohol is supposed to have overall health benefits. There is a growing body of evidence that alcohol triggers rapid changes in the immune system in the brain as well as neuronal changes. This immune response lies behind some of the well-known alcohol-related behavioral changes, such as difficulty controlling the muscles involved in walking and talking. Wu et al. find in experiments on mice that a receptor on immune cells (TLR4) that controls expression of genes related to the inflammatory response to pathogens is involved in alcohol-induced sedation and impaired motor activity. If the receptor’s action is blocked either by a drug (naloxone) or by the receptor’s genetic removal, the effects of alcohol are reduced. This suggests that drugs specifically targeting the TLR4 receptor might be useful in treating alcohol dependence and acute overdoses.

Dynamnic views of MindBlog

Some time ago I put a link you can see at the right top of this MindBlog home page to "DYNAMIC VIEWS OF MINDBLOG."  A reminder email from Google's Blogger News prompted me to click on the link for the first time in quite a while.  They have obviously been refining these views.  Give it a try....you can click through some very interesting ways of presenting posts in various arrays, many quite appealing visually.

Economic inequality is linked to biased self-perception

A common view is that westerners are more likely to be individualists who seek personal success and uniqueness, and thus self-enhance - (i.e. emphasize or exaggerate one’s desirable qualities relative to other people’s) - more than do Easterners, who are more likely to be collectivists seeking interpersonal harmony and belonging. An international group of collaborators proposes an alternative explanation that favors socioeconomic differences over cultural dimensions. They suggest that the extent to which people engage in biased self-perception is influenced by the economic structure of their society, specifically its level of economic inequality. They gathered data from 1,625 participants in five continents and 15 nations: Europe (Belgium, Estonia, Germany, Hungary, Italy, Spain), the Americas (Peru, the United States, Venezuela), Asia (China, Japan, Singapore, South Korea), Africa (South Africa), and Oceania (Australia). Participants completed a standard questionnaire assessing self-enhancement. The bottom line is that people in societies with more income inequality tend to view themselves as superior to others, and people in societies with less income inequality tend to see themselves as more similar to their peers.
Their abstract:

People’s self-perception biases often lead them to see themselves as better than the average person (a phenomenon known as self-enhancement). This bias varies across cultures, and variations are typically explained using cultural variables, such as individualism versus collectivism. We propose that socioeconomic differences among societies—specifically, relative levels of economic inequality—play an important but unrecognized role in how people evaluate themselves. Evidence for self-enhancement was found in 15 diverse nations, but the magnitude of the bias varied. Greater self-enhancement was found in societies with more income inequality, and income inequality predicted cross-cultural differences in self-enhancement better than did individualism/collectivism. These results indicate that macrosocial differences in the distribution of economic goods are linked to microsocial processes of perceiving the self.

Figure: Scatter plot (with best-fitting regression line) showing self-enhancement (as indexed by beta weights from a two-level model) as a function of economic inequality (as indexed by the Gini coefficient) across nations. The data points for Australia and Italy are very close and overlap on the graph.

A bit from their discussion:

It is unlikely that economic inequality directly leads to biased self-perception. It seems more likely that there are intervening factors that result from socioeconomic differences. One possibility ... is perceived competition. When benefits and costs are polarized by inequality, people may compete for social superiority. One manifestation of this drive may be the presentation of the self as superior through self-enhancement. Thus, it may be the competitiveness triggered by economic inequality that drives biased self-perception. It is interesting to note that competitiveness may be related to differences in individualism as well, with more individualistic societies also fostering greater competition. Both individualism and economic inequality may work in concert to foster a perception of competition that results in cultural differences in levels of self-enhancement.1 Likewise, both individualism and economic inequality may undermine the norm of modesty. Modesty norms play an important role in reducing self-enhancement, and when they are compromised, self-enhancement increases. In societies with more income equality, people may not only have more-equal incomes, but they may also feel a pressure to seem more similar to others. This may manifest as a modesty norm, whereby people are discouraged from voicing both real and perceived superiority. Understanding the relationship between socioeconomic structure and individual psychology can help bridge the gulf between large-scale sociological studies of societies and individual social and psychological functioning.

An important limitation of the study was that, except for the United States, participants were drawn from university populations, and university students might often find themselves in situations in which their social standing is actually better than the average person’s, an effect which would be more pronounced in societies with more income inequality.

Climate change and human crisis

In case you need anything further to depress you about our impending climate changes, Zhang et al. do a more fine-grained analysis of the effect of past episodes of climate catastrophe by bringing more quantitative scrutiny to try to confirm what scholars have qualitatively noted: that massive social disturbance, societal collapse, and population collapse often coincided with great climate change in America, the Middle East, China, and many other countries in preindustrial times.

Recent studies have shown strong temporal correlations between past climate changes and societal crises. However, the specific causal mechanisms underlying this relation have not been addressed. We explored quantitative responses of 14 fine-grained agro-ecological, socioeconomic, and demographic variables to climate fluctuations from A.D. 1500–1800 in Europe (a period that contained both periods of harmony and times of crisis). Results show that cooling from A.D. 1560–1660 caused successive agro-ecological, socioeconomic, and demographic catastrophes, leading to the General Crisis of the Seventeenth Century. We identified a set of causal linkages between climate change and human crisis. Using temperature data and climate-driven economic variables, we simulated the alternation of defined “golden” and “dark” ages in Europe and the Northern Hemisphere during the past millennium. Our findings indicate that climate change was the ultimate cause, and climate-driven economic downturn was the direct cause, of large-scale human crises in preindustrial Europe and the Northern Hemisphere.

Their data support the causal links shown in this figure:

Figure - Set of causal linkages from climate change to large-scale human crisis in preindustrial Europe. The terms in bold black type are sectors, and terms in red type within parentheses are variables that represent the sector. The thickness of the arrow indicates the degree of average correlation

Narcissistic Leaders and Group Performance

Nevica et al. point to yet another case where reality is at odds with perceptions:

Although narcissistic individuals are generally perceived as arrogant and overly dominant, they are particularly skilled at radiating an image of a prototypically effective leader. As a result, they tend to emerge as leaders in group settings. Despite people’s positive perceptions of narcissists as leaders, it was previously unknown if and how leaders’ narcissism is related to the performance of the people they lead. In this study, we used a hidden-profile paradigm to investigate this question and found evidence for discordance between the positive image of narcissists as leaders and the reality of group performance. We hypothesized and found that although narcissistic leaders are perceived as effective because of their displays of authority, a leader’s narcissism actually inhibits information exchange between group members and thereby negatively affects group performance. Our findings thus indicate that perceptions and reality can be at odds and have important practical and theoretical implications.

The evolution of cognition

It is now commonly recognized that high-level cognitive function is not limited to primate lineages and like many other traits, is shaped by selection imposed by ecological and environmental demands. MacClean et al. (PDF here) propose that a merger of the fields of comparative psychology and phylogenetics would greatly improve our ability to understand the forces that drive cognitive evolution:

Now more than ever animal studies have the potential to test hypotheses regarding how cognition evolves. Comparative psychologists have developed new techniques to probe the cognitive mechanisms underlying animal behavior, and they have become increasingly skillful at adapting methodologies to test multiple species. Meanwhile, evolutionary biologists have generated quantitative approaches to investigate the phylogenetic distribution and function of phenotypic traits, including cognition. In particular, phylogenetic methods can quantitatively (1) test whether specific cognitive abilities are correlated with life history (e.g., lifespan), morphology (e.g., brain size), or socio-ecological variables (e.g., social system), (2) measure how strongly phylogenetic relatedness predicts the distribution of cognitive skills across species, and (3) estimate the ancestral state of a given cognitive trait using measures of cognitive performance from extant species. Phylogenetic methods can also be used to guide the selection of species comparisons that offer the strongest tests of a priori predictions of cognitive evolutionary hypotheses (i.e., phylogenetic targeting). Here, we explain how an integration of comparative psychology and evolutionary biology will answer a host of questions regarding the phylogenetic distribution and history of cognitive traits, as well as the evolutionary processes that drove their evolution.

Very brief meditation training produces brain changes associated with positive emotions.

It is known that the ratio of left frontal to right frontal lobe activation is relatively higher in individuals with higher positive affect - this effect can be monitored by e.e.g. electrodes placed on the head. (In light of Gilbert's recent observation that "A wandering mind is an unhappy mind," I wonder if resting frontal asymmetry correlates with mind wandering....) Davidson and colleagues have shown that a fairly rigorous 8-week meditation training program can cause a significant increase the left-sided anterior activation associated with positive affect. Now Moyer et al. at the Univ. of Wisconsin, Stout, claim that a much briefer intervention can be effective. Participants..

...who did not differ in frontal EEG asymmetry before training, were randomly assigned to the meditation training (MT; n = 11) or waiting-list (WL; n = 10) group. MT participants were told that nine 30-min sessions of meditation instruction were available to them and were encouraged to attend as many sessions as possible. A standard protocol was used to measure positive and negative affect before and after 15 min of attempted focused-attention meditation according to provided instructions (“relax with your eyes closed, and focus on the flow of your breath at the tip of your nose; if a random thought arises, acknowledge the thought and then simply let it go by gently bringing your attention back to the flow of your breath”).

Some results from the paper:

MT and WL participants did not differ in frontal EEG asymmetry before training, paired t(13) = 0.16, r = −.01, p = .88, d = 0.06 (see Figure, click to enlarge). During training, MT participants attended an average of 6.73 (SD = 1.35, range = 4−8) instruction sessions and reported engaging in independent 15-min intervals of meditation an average of 2.24 (SD = 1.01, range = 1−5) times per week. MT participants averaged 6 hr 13 min of training (SD = 1 hr 35 min, range = 3 hr 15 min to 9 hr 8 min) across the 5 weeks. After training, MT participants had significantly greater leftward shift in frontal EEG asymmetry than WL participants did across all time points, paired t(13) = 10.80, r = .40, p less than .001, d = 3.18 (see Figure).

Comparison with the control group (WL) seems somewhat shakey. They were doing nothing except knowing they would be offered training after the first group? What about being given an amount for some other kind of 'instruction' (religious, philosophical, whatever) for the same intervals?

Some clips from the discussion:

With training, focused-attention meditation shifts frontal EEG asymmetry toward a pattern associated with positive, approach-oriented emotions. Further, this shift does not require hundreds or even dozens of hours of practice. Individual MT participants in this study averaged only 5 to 16 min of active training (i.e., instruction, independent practice) per day across 5 weeks, but still exhibited a strong change in EEG asymmetry compared with the WL group. Our results suggest that the benefits of meditation may be more accessible than was previously believed. However, this study does not indicate if such asymmetry is pervasive or is limited to the time of meditation and the brief intervals that immediately surround it...We suggest two explanations for the increase in EEG asymmetry that emerged after so little training. First, our MT participants were able to decide when to practice, and for how long; this flexibility allowed them to determine for themselves when they would be most receptive to meditation, and choosing advantageous times may have heightened the efficacy of the meditation. Second, the small amount of active practice participants reported may have enabled a larger amount of passive practice to occur spontaneously, without a conscious decision to meditate; such passive practice may have strengthened the effects of meditation. This latter explanation is consistent with reports from some MT participants that they occasionally found themselves focusing their attention in the way they had been taught, even without having set out to do so.

Adolescent brain changes while viewing media violence

Strenziok et al. (open access) note a habituation and desensitization of adolescent emotional network brain responses to TV violence, which raises the obvious concern that diminishing the linking of the consequences of aggression with an emotional response might promote aggressive attitudes and behavior.

Adolescents spend a significant part of their leisure time watching TV programs and movies that portray violence. It is unknown, however, how the extent of violent media use and the severity of aggression displayed affect adolescents’ brain function. We investigated skin conductance responses, brain activation and functional brain connectivity to media violence in healthy adolescents. In an event-related functional magnetic resonance imaging experiment, subjects repeatedly viewed normed videos that displayed different degrees of aggressive behavior. We found a downward linear adaptation in skin conductance responses with increasing aggression and desensitization towards more aggressive videos. Our results further revealed adaptation in a fronto-parietal network including the left lateral orbitofrontal cortex (lOFC), right precuneus and bilateral inferior parietal lobules, again showing downward linear adaptations and desensitization towards more aggressive videos. Granger causality mapping analyses revealed attenuation in the left lOFC, indicating that activation during viewing aggressive media is driven by input from parietal regions that decreased over time, for more aggressive videos. We conclude that aggressive media activates an emotion–attention network that has the capability to blunt emotional responses through reduced attention with repeated viewing of aggressive media contents, which may restrict the linking of the consequences of aggression with an emotional response, and therefore potentially promotes aggressive attitudes and behavior.

A Fauré Nocturne - new born chicks would like it....

I'm finding some of the Gabriel Fauré Noctures very pleasant. Here is Nocturne no. 3, op. 33. And, the abstract following the video is relevant to the debate over whether our preference of consonant music of this sort is rooted in acoustic properties important to the auditory system or is acquired through enculturation. Italian researchers find newly hatched domestic chicks show a spontaneous preference for a visual imprinting object associated with consonant sound intervals over an identical object associated with dissonant sound intervals. This suggests that preference for harmonic relationships between frequency components may be related to the prominence of harmonic spectra in biological sounds in natural environments.



Here is the abstract from Chiandetti and
Vallortigara1:

The question of whether preference for consonance is rooted in acoustic properties important to the auditory system or is acquired through enculturation has not yet been resolved. Two-month-old infants prefer consonant over dissonant intervals, but it is possible that this preference is rapidly acquired through exposure to music soon after birth or in utero. Controlled-rearing studies with animals can help shed light on this question because such studies allow researchers to distinguish between biological predispositions and learned preferences. In the research reported here, we found that newly hatched domestic chicks show a spontaneous preference for a visual imprinting object associated with consonant sound intervals over an identical object associated with dissonant sound intervals. We propose that preference for harmonic relationships between frequency components may be related to the prominence of harmonic spectra in biological sounds in natural environments.

Our "divided brain" - an animated tutorial.

A loyal mindblog reader has pointed me to an animated lecture, by psychiatrist and writer Iain McGilchrist, that is quite fun to watch. It starts by briefly describing and debunking the pop-psychology about our split brains that reached a peak in the 1970s (for imagination and reason you in fact need BOTH hemispheres), and then proceeds through a lucid explanation of the evolution and function of our brain's hemispheric asymmetry, and the advanced functions made possible by the inhibitory functions of our frontal lobes. McGilchrist cites and illustrates Pascal's point that "The end point of rationality is to demonstrate the limits of rationality." The last few minutes of the 11 minute video are notably informative and hysterically funny. At the conclusion McGilchrist cites Einstein's comment that "The intuitive mind is a sacred gift and the rational mind is a faithful servant," noting that we have created a society that honors the servant. (You should check out the RSA organization's website, which points to a number of lectures in this style.)

Women's memory enhanced by lower male voice pitch.

Women are attracted to low male voices, and a prevailing idea is that this is relevant to mate selection. Kevin Allen and colleagues now show that they are also more likely to remember what those low voices say to them. (It makes sense that memory should be sensitive towards content of adaptive value and thus help us to act in ways that enhance our reproductive fitness):

From a functionalist perspective, human memory should be attuned to information of adaptive value for one’s survival and reproductive fitness. While evidence of sensitivity to survival-related information is growing, specific links between memory and information that could impact upon reproductive fitness have remained elusive. Here, in two experiments, we showed that memory in women is sensitive to male voice pitch, a sexually dimorphic cue important for mate choice because it not only serves as an indicator of genetic quality, but may also signal behavioural traits undesirable in a long-term partner. In a first experiment, we found that women’s visual object memory is significantly enhanced when an object’s name is spoken during encoding in a masculinised (i.e., lower-pitch) versus feminised (i.e., higher-pitch) male voice, but that no analogous effect occurs when women listen to other women’s voices. A second experiment replicated this pattern of results, additionally showing that lowering and raising male voice pitch enhanced and impaired women’s memory, respectively, relative to a baseline (i.e., unmanipulated) voice condition. The modulatory effect of sexual dimorphism cues in the male voice may reveal a mate-choice adaptation within women’s memory, sculpted by evolution in response to the dilemma posed by the double-edged qualities of male masculinity.

Human genes still evolve rapidly

A Harvard group has found evolution in response to natural selection in a contemporary human population, showing a dramatic decrease in age of reproduction in a defined population since 1720. Context on the location of their study:

Ile aux Coudres is a 34-km2 island located ∼80 km to the northeast of Québec City along the St. Lawrence River (Canada). Thirty families settled on the island between 1720 and 1773 and the population reached 1,585 people by the 1950s. This population is ideal to study the genetic basis of life-history traits (LHTs). First, church registers provide exceptionally detailed records of dates of births, marriages, and deaths. Second, the long-term data and endogamy (marriages within the population) provide a deep and intricate pedigree to facilitate the separation of genetic and environmental influences on LHTs. Third, the population was very homogeneous among families, particularly in traits known to correlate with the timing of reproduction (social class, education, and religion). In addition, the split of resources among families was quite even due to the type of land distribution, and the number of professions was limited. This relative homogeneity should minimize confounding socioeconomic or shared environmental influences within quantitative genetic analyses.

Here is their abstract:

It is often claimed that modern humans have stopped evolving because cultural and technological advancements have annihilated natural selection. In contrast, recent studies show that selection can be strong in contemporary populations. However, detecting a response to selection is particularly challenging; previous evidence from wild animals has been criticized for both applying anticonservative statistical tests and failing to consider random genetic drift. Here we study life-history variation in an insular preindustrial French-Canadian population and apply a recently proposed conservative approach to testing microevolutionary responses to selection. As reported for other such societies, natural selection favored an earlier age at first reproduction (AFR) among women. AFR was also highly heritable and genetically correlated to fitness, predicting a microevolutionary change toward earlier reproduction. In agreement with this prediction, AFR declined from about 26–22 y over a 140-y period. Crucially, we uncovered a substantial change in the breeding values for this trait, indicating that the change in AFR largely occurred at the genetic level. Moreover, the genetic trend was higher than expected under the effect of random genetic drift alone. Our results show that microevolution can be detectable over relatively few generations in humans and underscore the need for studies of human demography and reproductive ecology to consider the role of evolutionary processes.

The brain's fountain of youth

Williams points to an article that suggests that Dracula may have gotten it right. Young blood can restore an aging body. Giving young blood to older mice is know to boost their immune system and muscle function, and now it turns out that it also causes the synthesis of new nerve cells, boosting the number of cells in the hippocampus involved in memory formation. Conversely, serum from older mice decreases the number of these memory cells in younger mice. Wyss-Coray and collaborators find a blood borne protein (cytokine CCL11) that increases with aging and inhibits synthesis of new nerve cells. Factors stimulating neurogenesis are being sought. Here is their abstract:

In the central nervous system, ageing results in a precipitous decline in adult neural stem/progenitor cells and neurogenesis, with concomitant impairments in cognitive functions. Interestingly, such impairments can be ameliorated through systemic perturbations such as exercise1. Here, using heterochronic parabiosis we show that blood-borne factors present in the systemic milieu can inhibit or promote adult neurogenesis in an age-dependent fashion in mice. Accordingly, exposing a young mouse to an old systemic environment or to plasma from old mice decreased synaptic plasticity, and impaired contextual fear conditioning and spatial learning and memory. We identify chemokines—including CCL11 (also known as eotaxin)—the plasma levels of which correlate with reduced neurogenesis in heterochronic parabionts and aged mice, and the levels of which are increased in the plasma and cerebrospinal fluid of healthy ageing humans. Lastly, increasing peripheral CCL11 chemokine levels in vivo in young mice decreased adult neurogenesis and impaired learning and memory. Together our data indicate that the decline in neurogenesis and cognitive impairments observed during ageing can be in part attributed to changes in blood-borne factors.

"Neurotrash"

In The Chronicle of Higher Education Marc Parry notes the crusade of Raymond Tallis to throw out the "Neurotrash." This is the goal of his new book "Aping Mankind: Neuromania, Darwinitis, and the Misrepresentation of Humanity" (McGill-Queen's University Press). Parry describes a Tallis lecture that seeks to demolish

…two "pillars of unwisdom." The first, "neuromania," is the notion that to understand people you must peer into the "intracranial darkness" of their skulls with brain-scanning technology. The second, "Darwinitis," is the idea that Charles Darwin's evolutionary theory can explain not just the origin of the human species—a claim Tallis enthusiastically accepts—but also the nature of human behavior and institutions….Those trends, as Tallis sees them, are like "intellectual illnesses" metastasizing from academic labs into popular culture. He sees the symptoms in neuro-economic thinkers who explain our susceptibility to subprime mortgages by describing how our brains evolved to favor short-term rewards. He sees them in philosophers who claim that our primate minds admire paintings of landscapes that would have supported hunting and gathering. He sees it in neurotheologians who preach that "God is a tingle in the 'God spot' in the brain."

The points Tallis makes are good, much of the press description of 'love spots in the brain' , etc. is nonsense…but Tallis does seem to throw out the baby with the bathwater. How could we make sense of the irrational social behaviors described in the previous two mindblog posts this week outside of an evolutionary framework, and how do we explain that activities of certain brain areas, when perturbed by strokes, electrical stimulation, or drugs do alter fairly discrete classes of behaviors?

Brief neuroscience video-tutorials

I recently received an email from Aki Nikolaidis, a neuroscience graduate student at the University of Illinois, asking me to have a look some brief instructional videos he had been making over the past several years. I took a look, and found them quite engaging. Here they are:

Fluid Intelligence

Consciousness and Free Will

Non-conscious Information Processing

Electroencephalogram (EEG)

Working Memory Training

The science of irrationality.

As a followup to yesterday's post on how common sense, ideology and intuition lead us astray in our attempts to fix social problems - while social intervention programs that have been validated by true randomized experiments are ignored - I point to Jonah Lehrer's brief review of Daniel Kahneman's new book "Thinking, Fast and Slow.", which describes his work on evolved blind spots in our rational processes which appear to be virtually impossible to fix, even though we understand that they are there.

When people face an uncertain situation, they don't carefully evaluate the information or look up relevant statistics. Instead, their decisions depend on mental short cuts, which often lead them to make foolish decisions. The short cuts aren't a faster way of doing the math; they're a way of skipping the math altogether...The biases and blind-spots identified by Messrs. Kahneman and Tversky aren't symptoms of stupidity. They're an essential part of our humanity, the inescapable byproducts of a brain that evolution engineered over millions of years.

Consider the overconfidence bias, which drives many of our mistakes in decision-making. The best demonstration of the bias comes from the world of investing. Although many fund managers charge high fees to oversee stock portfolios, they routinely fail a basic test of skill: persistent achievement. As Mr. Kahneman notes, the year-to-year correlation between the performance of the vast majority of funds is barely above zero, which suggests that most successful managers are banking on luck, not talent...This shouldn't be too surprising. The stock market is a case study in randomness, a system so complex that it's impossible to predict. Nevertheless, professional investors routinely believe that they can see what others can't. The end result is that they make far too many trades, with costly consequences.

We like to see ourselves as a Promethean species, uniquely endowed with the gift of reason. But Mr. Kahneman's simple experiments reveal a very different mind, stuffed full of habits that, in most situations, lead us astray. Though overconfidence may encourage us to take necessary risks—Mr. Kahneman calls it the "engine of capitalism"—it's generally a dangerous (and expensive) illusion.

What's even more upsetting is that these habits are virtually impossible to fix. As Mr. Kahneman himself admits, "My intuitive thinking is just as prone to overconfidence, extreme predictions and the planning fallacy as it was before I made a study of these issues."...Even when we know why we stumble, we still find a way to fall.

The science of psychological change

In the Oct 14 issue of Science Magazine
Geoffrey L. Cohen reviews Timothy Wilson's new book "Redirect: The Surprising New Science of Psychological Change." The book reviews success stories in social psychology, and I thought it would be worthwhile to pass on a few clips from that review:

There are interventions that harness the power of expressive writing and volunteerism to improve happiness and health and to lessen rates of teen pregnancy. There are interventions that reduce student failure and close gaps between minority and nonminority students by inculcating in them core positive beliefs that sustain them through hardship, such as the belief that intelligence is not a fixed entity but rather like a muscle that grows with effort. There are interventions that improve intertribal trust in Rwanda by modeling cooperative intergroup relations through radio soap operas. In the United States, interventions that defuse blacks' and whites' fear of interracial rejection increase their likelihood of becoming friends. And...there are studies that cleverly manipulate social norms to reduce teen alcohol use and encourage energy conservation.

And notes:

What these interventions share is that they are grounded in science, found effective in randomized experiments, have surprisingly large and durable effects—and, by and large, aren't used. Over and over, Wilson writes, schools, government agencies, and workplaces opt for interventions that not only have never been subjected to experimental test but also, when they finally are, often yield null and even negative effects. These interventions are usually based on a combination of intuition, ideology, and good intentions. Wilson critiques several popular but unwise interventions: Drug Abuse Resistance Education (D.A.R.E., implemented in 75% of the school districts in the United States), “scared straight,” certain forms of posttraumatic grief counseling, many commonplace diversity training programs, and the self-help and positive thinking industry in general ["The Secret" book receives sustained criticism]. These are analogous, Wilson writes, to the practices of leeching and blood-letting before the scientific method took hold in medicine.

Wilson uses the thought-provoking metaphor of “story editing” to describe the ingredient common to many of the successful interventions he reviews. They alter the narratives people tell themselves about their world and their place in it: Is it safe or threatening? Do I belong or not? Am I capable or not? During sensitive periods, people's storytelling can be redirected and the change can build on itself over time. Amend the opening sentence of the story of your transition to college, or to a new job, and the arc of your story may be entirely different from what it would have been otherwise. This helps explain why seemingly simple interventions, such as writing about a traumatic experience, or volunteering for a humanitarian cause, improve health and well-being. They give people an organizing narrative that puts their lives in an optimistic context.