Deric Bownds' MindBlog

Stress makes men prefer dissimilar mates.

mdbownds@wisc.edu (Deric Bownds) — Thu, 18 Mar 2010 09:30:00 +0000

Lass-Hennemann et al. make the interesting observation that men, who generally prefer mates that resemble themselves, switch to preferring dissimilar mates after they are subjected to a very simple stress procedure (holding their right hand in ice water for three minutes). This conforms with research in animals showing that individuals under stress are willing to mate with a wider variety of partners. Attraction to the images shown was measured by an interesting technique, noting startle eyeblink responses to a burst of white noise. Those in a more upbeat frame of mind (i.e. feeling attraction) flinch less. Scratching around for a possible evolutionary rationale for this behavior, one suggestion is that when conditions seem favorable men have the option of picking physically similar mates, whom they subconsciously deem dependable partners who will nurture their offspring. But in stressful times, during which human survival is less guaranteed, men would be more willing to risk a physically dissimilar partner in order to father as many children as possible.

Here is a figure describing how the stimulus photographs were morphed:

Image editing procedure: the nude woman's detailed face (1) was morphed with the portrait picture of the participant (2). The morphing software produces two output images, a shape-only morph (3a) and a combined shape-colour morph (3b). In a second step, the shape-colour morph is used as a semi-transparent layer on top of the shape-only morph. All artefacts of the morphing procedure are eliminated. The resulting image (4) was photo-mounted on the woman's body in a last step (5). The resulting image was used as a stimulus (the image was not masked in the experiment).

Streaming: new culture or cultural dissolution?

mdbownds@wisc.edu (Deric Bownds) — Thu, 18 Mar 2010 09:15:00 +0000

Following the thread of Monday's post on the lost art of the R.S.V.P. , I was struck by this Huffington Post bit on the SXSW (South by Southwest) conference in Austin this past weekend - "Life is but a stream" - that from my point of view points to a future of everyone swirling in a present-centered miasma...

...Activity Streams, Social Objects and a little glimpse into how the data that is our lifestream will grow. And soon.

...SXSW, of course, isn't about the techies, it's about musicians and filmmakers, right? Not so different, as it turns out. They're all developers. All techies. Not just because of the digitization of the music and film industries, but because these are all people who make something from nothing. Inventors. Artists. Creatives. What less people saw coming, I think, was how creative the tech crowd is. How well they fit in and belong with the musicians and movie-makers.

Where does good music come from? Where does great movie writing come from? Some kind of emotional center. So, it was interesting to hear ZeFrank, a guy most people probably refer to as a "viral video maker" talking so much about emotional content. And the guy delivers on it, too. Much of what he has on his site not only will make you think, it reaches you at that emotional center. And it all relies on social experiments.

...Social Objects, Mediated Artifacts and Life Streams are simply techie ways of saying that a system is being engineered that will better capture how you live. That's all. Right now, computers put things into folders, but that's going to change real fast. How? That's not how this works.

If you've written a song, you can relate to this. It's a play between your feeling and the notes available to you. Back and forth. What's happening right now online is that new notes are being added to the scale. What is the future? Listen to the artists. They're all here at SXSW.

Lesion mapping of our brain's general intelligence system.

mdbownds@wisc.edu (Deric Bownds) — Wed, 17 Mar 2010 09:30:00 +0000

Adolphs, Damasio, Tranel, and collaborators have published a fascinating open access study in which they report results of having administered standard general intelligence tests to 241 neurologic patients who were being evaluated in connection with their enrollment in the Iowa Cognitive Neuroscience Patient Registry at the University of Iowa, over the course of approximately 2 decades. They found statistically significant associations between g and damage to a remarkably circumscribed, although distributed, network in frontal and parietal cortex, critically including white matter association tracts and frontopolar cortex. They suggest hat general intelligence draws on connections between regions that integrate verbal, visuospatial, working memory, and executive processes. In particular they found a region in the left frontal pole (white circles in Figure 3) that is unique to g and not captured by other subtests. A clip from their discussion:

The largest overlap between WAIS subtests and g was found for Arithmetic, Similarities, Information, and Digit Span; the former two tests also exhibited the greatest conjunction with g. These subtests assess verbal knowledge about the world, verbal reasoning, and abstraction, as well as working memory capacity, and are associated with the left inferior frontal gyrus, the superior longitudinal/arcuate fascicule, and to some degree with parietal cortex (Fig. 3). This suggests that g draws on the combination of conceptual knowledge and working memory, and that the communication between areas associated with these capacities is of crucial importance. Such an interpretation is consistent with the Parieto-Frontal Integration Theory (P-FIT), which postulates roles for cortical regions in the prefrontal (Brodman Area 6, 9–10, 45–47), parietal (BA 7, 39–40), occipital (BA 18–19), and temporal association cortex (BA 21, 37). Our results emphasize the important role of white matter tracts in binding the proposed regions together into a unified system subserving g, in line with a recent study relating white matter integrity to intellectual performance: the study reported significant correlations between integrity of the superior fronto-occipital fasciculus and full-scale intelligence quotient (IQ) (a measure related, but not identical, to g).

One of the caveats they mention:

.... Spearman's g disregards theories of multiple intelligences and does not incorporate specific emotional abilities. Therefore we may have isolated an anatomical network important for processing external stimuli, which might operate in parallel with others that are more critical for stimulus reward processing and interoception.

The decay of sympathy...

mdbownds@wisc.edu (Deric Bownds) — Wed, 17 Mar 2010 09:15:00 +0000

Brooks does a concise piece on how the innate sense of fairness and sympathy that we exhibit towards each other in small groups (as in the U.S. Senate as it used to exist) vanishes when groups are in competition with each other (as in the Senate now). The story of human evolution is the story of competition between groups of humans that are held together internally by more generous and empathetic behaviors than the groups exhibit towards each other. Clips:

In the United States, leaders in the House of Representatives have done an effective job in getting their members to think in group, not person-to-person, terms. Members usually vote as party blocs. Individuals have very little power. That’s why representatives are often subtle and smart as individuals, but crude and partisan as a collective. The social psychology of the House is a clan psychology, not an interpersonal psychology.

The Senate, on the other hand, has historically been home to more person-to-person thinking. This is because the Senate is smaller and because of Senate rules. Until recently, the Senate leaders couldn’t just ram things through on party-line votes. Because a simple majority did not rule, and because one senator had the ability to bring the whole body to a halt, senators had an incentive, every day, to develop alliances and relationships with people in the other party.

But power trumps principle. In nearly every arena of political life, group relationships have replaced person-to-person relationships. The tempo of the Senate is now set by partisan lunches every Tuesday, whereas the body almost never meets for conversation as a whole. The Senate is now in the process of using reconciliation — rule by simple majority — to try to pass health care.

We have a political culture in which the word “reconciliation” has come to mean “bitter division.” With increasing effectiveness, the system bleaches out normal behavior and the normal instincts of human sympathy.

Belief in free will is a belief in vitalism

mdbownds@wisc.edu (Deric Bownds) — Tue, 16 Mar 2010 09:30:00 +0000

Any readers who have checked out my web lectures or podcasts (particularly the "I-Illusion") know how I deal with the topic of free will and determinism. I would recommend that those of you interested in this topic read this excellent open access essay in PNAS by Anthony Cashmore. (Figure 1 is a nice summary of models for the flow of information between unconscious neural activity and conscious thought.) The abstract and a figure:

It is widely believed, at least in scientific circles, that living systems, including mankind, obey the natural physical laws. However, it is also commonly accepted that man has the capacity to make “free” conscious decisions that do not simply reflect the chemical makeup of the individual at the time of decision—this chemical makeup reflecting both the genetic and environmental history and a degree of stochasticism. Whereas philosophers have discussed for centuries the apparent lack of a causal component for free will, many biologists still seem to be remarkably at ease with this notion of free will; and furthermore, our judicial system is based on such a belief. It is the author’s contention that a belief in free will is nothing other than a continuing belief in vitalism—something biologists proudly believe they discarded well over 100 years ago.

Figure (click to enlarge) - Models for the flow of information between unconscious neural activity and conscious thought. In A, the commonly accepted model is shown whereby WILL influences conscious thought and, in turn, unconscious neural activity, to direct behavior. The difficulty with this model is that there is no causal component directing WILL. In B, a causal component for WILL is introduced; however WILL now simply reflects unconscious neural activity and GES (genes, environment, and stochasticism). That is, WILL loses its “freedom.” In C, WILL is dispensed with, and conscious thought is simply a reflection of unconscious neural activity and GES. Conscious thought is now primarily a means of following—more than a means of influencing—the direction of behavior by unconscious neural activity. This subservient role of conscious thought in directing behavior in model C, is indicated by the dotted arrow 2 (contrasting with the solid line for the corresponding arrow in A and B).

The lost art of the R.S.V.P.

mdbownds@wisc.edu (Deric Bownds) — Tue, 16 Mar 2010 09:15:00 +0000

Cooper does a NYTimes op-ed piece that perfectly describes my own experience (and frustration) when I have sent out invitations to a music afternoon at my Madison WI. home. It is worth passing on here:

HERE’S an etiquette experiment for you: E-mail an invitation for a party, one month out, to 45 friends. Request an R.S.V.P. Provide a follow-up e-mail message, two weeks later, politely reminding them to get back to you....How many will?...My experiment arose from plans for an evening of food, drink and literature, with readings by myself and two other writers, at a restaurant. Not exactly a drop-in-if-you’re-around kind of thing, so I asked friends to R.S.V.P. My initial message brought in a dozen responses, and the follow-up a few more, but days before the event I had a paltry 23. Not 23 who planned to come, but 23 who had bothered to respond. Half my invitees had blown me off. Why? I wasn’t peddling life insurance, after all.

Asking around, I discovered that the phenomenon is widespread. One friend of mine e-mailed invitations to a baby shower, and a third of the recipients failed to respond. Another announced a happy hour at her house and received a dozen yeses — only to find her party besieged by 35 people....What’s preventing us from executing this basic social task? Is it the medium? Do Evites somehow not feel like “real” invitations? Is it our busy lives, so overbooked and overwhelmed we’ve drawn up the castle gates? Don’t invite me out this month, I’m ensconced! Or is it simple rudeness? Try as I might to understand, I kept feeling dissed.

What’s clear is how hard the R.S.V.P. rubs against the grain of contemporary life. In requesting people to anchor a plan in the distant future of a month hence, you are demanding a kind of navigation that Americans increasingly do not practice. We prefer to remain flexy, solidifying our plans incrementally as the date approaches. Let’s talk tomorrow. I’ll call you when I’m on the road. Cellphones in hand, we microadjust our schedules as they unfold around us. We’re like the air traffic controllers of our own lives.

It wasn’t always so. A while ago I made a lunch date with an elderly couple. As the day approached with no subsequent corroboration, I felt a strange excitement. Would all three of us just show up? We did, and I realized that what I felt was a small nostalgic thrill over social arrangements that seemed straight out of Jane Austen.

But back to my party. The day before the big event, I sent a final e-mail message, thanking “the half of you who responded for helping keep the dying art of the R.S.V.P. alive.” This irked missive flushed out a final 10 hangdog respondents. But there remained a gang of 12 — the dirty dozen, the truly hardcore, fanatical nonresponders — who couldn’t even be shamed into R.S.V.P.ing...In the end, perhaps they were merely following the French literally: Respond, if you please. Left over from a time when graciousness couched demands as requests, the R.S.V.P. no longer functions. I therefore propose an update, something still French but a bit more ... frank — the R.V.O.M.: Répondez Vite — ou Mourir! (Respond Quickly, or Die!)

Brain regions and the DC metro

mdbownds@wisc.edu (Deric Bownds) — Mon, 15 Mar 2010 09:15:00 +0000

A reader's comment on last Wednesday's post points to a graphic (see below, click on it to enlarge) showing an amazingly credible mapping of brain regions onto the Washington, DC metro system.

New nerve cell growth in stress-induced social avoidance.

mdbownds@wisc.edu (Deric Bownds) — Mon, 15 Mar 2010 09:00:00 +0000

Lagace et al. look at changes in the dentate gyrus region of the hippocampus to probe why some people are resilient to long-term chronic stress while others develop maladaptive functioning. They examined chronic social defeat stress in a mouse model, finding that synthesis of new nerve cells is increased after social defeat stress selectively in mice that display persistent social avoidance. Irradiation that halts formation of these new nerve cells inhibits appearance of social avoidance, suggesting a functional role for adult-generated dentate gyrus neurons. The data show that the time window after cessation of stress is a critical period for the establishment of persistent cellular and behavioral responses to stress and that a compensatory enhancement in neurogenesis is related to the long-term individual differences in maladaptive responses to stress.

The Blues Broaden, but the Nasty Narrows

mdbownds@wisc.edu (Deric Bownds) — Fri, 12 Mar 2010 10:30:00 +0000

A great article title from Gable and Harmon-Jones, and yet another study involving students in an introductory psychology course: observations that highly motivated positive and negative emotions go with narrowing of our attentional focus, but either positive or negative low-motivation feelings broaden attention. Their slightly edited abstract:

Positive and negative affects high in motivational intensity cause a narrowing of attentional focus. In contrast, positive affects low in motivational intensity cause a broadening of attentional focus. The attentional consequences of negative affects low in motivational intensity have not been experimentally investigated. A first experiment (using color photographs, selected from the International Affective Picture System) compared the attentional consequences of negative affect low in motivational intensity (sadness) relative to a neutral affective state. Results indicated that low-motivation negative affect caused attentional broadening. A second experiment found that disgust, a high-motivation negative affect not previously investigated in attentional studies, narrowed attentional focus. These experiments support the conceptual model linking high-motivation affective states to narrowed attention and low-motivation affective states to broadened attention.

Thoughts of randomness enhance supernatural beliefs.

mdbownds@wisc.edu (Deric Bownds) — Thu, 11 Mar 2010 10:30:00 +0000

Kay et al. do some interesting experiments in which thoughts of randomness are primed in subject by a set of manipulations. They:

...supraliminally primed half the participants with randomness-related words; the other half were primed with words matched in negative valence. To assess the role of arousal, we employed a misattribution paradigm, which involved requiring all participants to swallow a pill ostensibly containing an herbal supplement. Half the participants were told that the pill sometimes induces arousal as a side effect, and half were told that the pill has no side effects. Previous work has shown that the side-effect condition leads participants to attribute the cause of any experienced arousal to this salient source. Hypothesizing that beliefs in supernatural control function, at least in part, to down-regulate the aversive arousal associated with randomness, we expected the randomness primes to increase beliefs in God, but only for those participants not given the opportunity to attribute the cause of their arousal to the ingested pill.

Their observations were that:

...participants primed with randomness-related words exhibited heightened beliefs in spiritual control compared with participants primed with negatively valenced control words. This effect disappeared when participants were given the opportunity to attribute the cause of any arousal they experienced to a pill ingested earlier in the session.

They take their data to suggest:

...that belief in supernatural sources of control, such as God and karma, may function, in part, to defend against distress associated with randomness, even when the perception of randomness is not related to traumatic events.

Demasculinization of frogs (and men?) by pesticides

mdbownds@wisc.edu (Deric Bownds) — Thu, 11 Mar 2010 10:20:00 +0000

Male sperm count has dropped dramatically over the past 50 years (~50% in some areas) and one of the prime suspects is estrogen like compounds, such as the pesticide atrazine, that have been introduced into the environment. Atrazine is one of the most commonly applied agricultural pesticides in the world (and, curiously, male sperm count has dropped more in agricultural than in metropolitan areas). Hays et al now show that at levels of only 2.5 parts per billion it can completely feminize amphibian males.

Strange Maps

mdbownds@wisc.edu (Deric Bownds) — Wed, 10 Mar 2010 10:40:00 +0000

Having spent a fair amount of time on the London underground this past summer, I thought this graphic of an imagined world-wide system, shown in the Sunday NYTimes Book Review section, was intriguing.

An imagined train route from Oslo to Pyongyang, from STRANGE MAPS: An Atlas of Cartographic Curiosities (Viking Studio, paper, $30).

Men's testosterone increases with female ovulation cues

mdbownds@wisc.edu (Deric Bownds) — Wed, 10 Mar 2010 10:30:00 +0000

Observations from Miller and Manor:

Adaptationist models of human mating provide a useful framework for identifying subtle, biologically based mechanisms influencing cross-gender social interaction. In line with this framework, the current studies examined the extent to which olfactory cues to female ovulation—scents of women at the peak of their reproductive fertility—influence endocrinological responses in men. Men in the current studies smelled T-shirts worn by women near ovulation or far from ovulation (Studies 1 and 2) or control T-shirts not worn by anyone (Study 2). Men exposed to the scent of an ovulating woman subsequently displayed higher levels of testosterone than did men exposed to the scent of a nonovulating woman or a control scent. Hence, olfactory cues signaling women’s levels of reproductive fertility were associated with specific endocrinological responses in men—responses that have been linked to sexual behavior and the initiation of romantic courtship.

More on the virtues of red wine...

mdbownds@wisc.edu (Deric Bownds) — Tue, 09 Mar 2010 14:10:00 +0000

A further rationale for my sipping red wine during and after dinner - O'Connor notes work showing that red wine does indeed aid the digestion, particularly of dark meats, because it both stimulates digestion and inhibits the formation of harmful oxidized fats.

Fundamental changes in public discourse.

mdbownds@wisc.edu (Deric Bownds) — Tue, 09 Mar 2010 10:30:00 +0000

Three recent New York Times pieces have provided a summary of the disintegration of public discourse since the era of Lyndon Johnson. David Carr notes the demise of a short-lived column in The Washington Post on Washington's social life which is symbolic of the passing of the old paradigm, in which

...people with different points of view would assemble in various salons of Georgetown and set aside their differences over an Old Fashioned before the coq au vin was even served...Now the butter knife has been replaced by a machete. People with opposing political points of view are less likely to eat with the loyal opposition at night than to try to dine on them in a quick hit on MSNBC or Fox News... “The dinner party at Ben and Sally’s or Mrs. Graham’s circa 1975 was The Note or Mike Allen blast e-mail of its day,” said David Von Drehle, editor at large for Time and a former editor of The Post’s Style section..."You would go there to see people, try out ideas, figure out what was the interesting next take on the day’s news and where the hot story was headed. But now, you find all that out just by opening up your laptop in the morning.”

Articles by both John Harwood and Paul Krugman chronicle the almost perfect polarization that now characterizes the political scene. Harwood:

...when President Lyndon B. Johnson won passage of Medicare, most of the Democratic majority in Congress and half of the Republicans backed him...Those Democratic and Republican parties no longer exist. The kinds of Southern Democrats who resisted Johnson’s agenda and Northern Republicans who supported it have switched parties; longstanding differences between liberals and conservatives are now reinforced by party affiliation, not blurred by it...What democrats and republicans share is a dedication to party unity as an overriding imperative — and a relentlessly improving track record of achieving it.

And Krugman focuses on:

...the incredible gap that has opened up between the parties. Today, Democrats and Republicans live in different universes, both intellectually and morally...Democrats believe .. what textbook economics says: that when the economy is deeply depressed, extending unemployment benefits not only helps those in need, it also reduces unemployment...the Congressional Budget Office says that aid to the unemployed is one of the most effective forms of economic stimulus, as measured by jobs created per dollar of outlay. [The view of the second ranking senate Republican, in contrast is that:]... unemployment relief “doesn’t create new jobs. In fact, if anything, continuing to pay people unemployment compensation is a disincentive for them to seek new work.”

...the difference between the two universes isn’t just intellectual, it’s also moral...How can the parties agree on policy when they have utterly different visions of how the economy works, when one party feels for the unemployed, while the other weeps over affluent victims of the “death tax”?..bipartisanship is now a foolish dream...Someday, somehow, we as a nation will once again find ourselves living on the same planet. But for now, we aren’t. And that’s just the way it is.

Looking at motor imagery underlying complex skill learning.

mdbownds@wisc.edu (Deric Bownds) — Mon, 08 Mar 2010 10:25:00 +0000

During a recent period of rehearsing for the four hands piano recital that I participated in yesterday,* I found myself observing (mentally imaging) the detailed execution of the pieces when I woke during the night or early morning. Such imaging is known to be a central part of learning skilled sequences in athletic and musical performance. In a bit of fortuitous timing, the most recent issue of PNAS has an article by Miller et al. describing direct observation of this kind of motor imagery:

Imagery of motor movement plays an important role in learning of complex motor skills, from learning to serve in tennis to perfecting a pirouette in ballet. What and where are the neural substrates that underlie motor imagery-based learning? We measured electrocorticographic cortical surface potentials in eight human subjects during overt action and kinesthetic imagery of the same movement, focusing on power in “high frequency” (76–100 Hz) and “low frequency” (8–32 Hz) ranges. We quantitatively establish that the spatial distribution of local neuronal population activity during motor imagery mimics the spatial distribution of activity during actual motor movement. By comparing responses to electrocortical stimulation with imagery-induced cortical surface activity, we demonstrate the role of primary motor areas in movement imagery. The magnitude of imagery-induced cortical activity change was ∼25% of that associated with actual movement. However, when subjects learned to use this imagery to control a computer cursor in a simple feedback task, the imagery-induced activity change was significantly augmented, even exceeding that of overt movement.

*(I have put some rehearsal videos made before the recital here and here, but the final recordings turned out to have technical recording problems and so can't be posted.)

Funny or die

mdbownds@wisc.edu (Deric Bownds) — Mon, 08 Mar 2010 10:20:00 +0000

Under the "random curious stuff" category mentioned in MindBlog's title line, I couldn't resist passing on this satirical gem from funnyordie.com

Funny or Die's Presidential Reunion from Will Ferrell

Measuring consciousness -how an anesthetic puts us to sleep.

mdbownds@wisc.edu (Deric Bownds) — Fri, 05 Mar 2010 10:30:00 +0000

Ferrarelli et al. show what is happening when we are zonked out by an anesthetic like the benzodiazepine midazolam. They use an array of EEG electrodes on the head to measure how much the activities of different areas of the cortex are coordinated with each other when a magnetic pulse is applied to stir things up (transcranial magnetic stimulation, or TMS). When we are awake TMS triggers responses in multiple cortical areas lasting for more than 300 ms, during midazolam-induced loss of consciousness, TMS-evoked activity is shorter and more local, i.e. areas of the cortex stop talking to each other. Here is their abstract:

By employing transcranial magnetic stimulation (TMS) in combination with high-density electroencephalography (EEG), we recently reported that cortical effective connectivity is disrupted during early non-rapid eye movement (NREM) sleep. This is a time when subjects, if awakened, may report little or no conscious content. We hypothesized that a similar breakdown of cortical effective connectivity may underlie loss of consciousness (LOC) induced by pharmacologic agents. Here, we tested this hypothesis by comparing EEG responses to TMS during wakefulness and LOC induced by the benzodiazepine midazolam. Unlike spontaneous sleep states, a subject’s level of vigilance can be monitored repeatedly during pharmacological LOC. We found that, unlike during wakefulness, wherein TMS triggered responses in multiple cortical areas lasting for >300 ms, during midazolam-induced LOC, TMS-evoked activity was local and of shorter duration. Furthermore, a measure of the propagation of evoked cortical currents (significant current scattering, SCS) could reliably discriminate between consciousness and LOC. These results resemble those observed in early NREM sleep and suggest that a breakdown of cortical effective connectivity may be a common feature of conditions characterized by LOC. Moreover, these results suggest that it might be possible to use TMS-EEG to assess consciousness during anesthesia and in pathological conditions, such as coma, vegetative state, and minimally conscious state.

Are kids overmedicated?

mdbownds@wisc.edu (Deric Bownds) — Fri, 05 Mar 2010 10:20:00 +0000

Zuger reviews a book by Judith Warner on a topic that I and many others have had a knee jerk reflex type opinion on: "Yes, of course kids are overmedicated by lazy parents and pill popping psychologists." Warner began her study with that attitude, intending to prove her point, and found quite the opposite. She:

...sallied forth to interview all the pushy parents, irresponsible doctors and overmedicated children she could find — and lo, she could barely find any. After several years of dead ends, missed deadlines and worried soul-searching, she was forced to reconsider her premise and start all over again.

“A couple of simple truths have become clear,” she writes with the passion of a new convert. “That the suffering of children with mental health issues (and their parents) is very real. That almost no parent takes the issue of psychiatric diagnosis lightly or rushes to ‘drug’ his or her child; and that responsible child psychiatrists don’t, either. And that many children’s lives are essentially saved by medication, particularly when it’s combined with evidence-based forms of therapy.”

The power of touch.

mdbownds@wisc.edu (Deric Bownds) — Thu, 04 Mar 2010 10:35:00 +0000

I've been meaning to point to an interesting article by Benedict Carey on our voluntary momentary touches that can - whether an exuberant high five, a warm hand on the shoulder, or a creepy touch to the arm — communicate an even wider range of emotion than gestures or expressions, and sometimes do so more quickly and accurately than words. He focuses on work of Dacher Keltner, Hertenstein, and collaborators, the subject of previous posts (PDF here, also, enter Keltner in the search box in the left column). In their experiments volunteers tried to communicate a list of emotions by touching a blindfolded stranger. The participants were able to communicate eight distinct emotions, from gratitude to disgust to love, some with about 70 percent accuracy. Here is their abstract:

The study of emotional communication has focused predominantly on the facial and vocal channels but has ignored the tactile channel. Participants in the current study were allowed to touch an unacquainted partner on the whole body to communicate distinct emotions. Of interest was how accurately the person being touched decoded the intended emotions without seeing the tactile stimulation. The data indicated that anger, fear, disgust, love, gratitude, and sympathy were decoded at greater than chance levels, as well as happiness and sadness, 2 emotions that have not been shown to be communicated by touch to date. Moreover, fine-grained coding documented specific touch behaviors associated with different emotions.

A forthcoming publication from Kraus, Huang, and Keltner finds that, with a few exceptions, good basketball teams tended to be touchier than bad ones. Another slightly edited clip:

If a high five or an equivalent can in fact enhance performance, on the field or in the office, that may be because it reduces stress. A warm touch seems to set off the release of oxytocin, a hormone that helps create a sensation of trust, and to reduce levels of the stress hormone cortisol...In the brain, prefrontal areas, which help regulate emotion, can relax, freeing them for another of their primary purposes: problem solving. In effect, the body interprets a supportive touch as “I’ll share the load.”...“We think that humans build relationships precisely for this reason, to distribute problem solving across brains,” said James A. Coan, a a psychologist at the University of Virginia. “We are wired to literally share the processing load, and this is the signal we’re getting when we receive support through touch.”

The same is certainly true of partnerships, and especially the romantic kind, psychologists say. In a recent experiment, researchers led by Christopher Oveis of Harvard conducted five-minute interviews with 69 couples, prompting each pair to discuss difficult periods in their relationship...The investigators scored the frequency and length of touching that each couple, seated side by side, engaged in... "it looks so far like the couples who touch more are reporting more satisfaction in the relationship,” he said. Again, it’s not clear which came first, the touching or the satisfaction. But in romantic relationships, one has been known to lead to the other. Or at least, so the anecdotal evidence suggests.

Food and Flying

mdbownds@wisc.edu (Deric Bownds) — Thu, 04 Mar 2010 10:30:00 +0000

An interesting tidbit from the Random Samples section of the 19 Feb. issue of Science Magazine:

German scientists have figured out why tomato juice tastes better aboard an airplane than on the ground (and coffee tastes worse). Low atmospheric pressure dampens the experience of sweet and salty tastes whereas sour comes through unchanged and bitter is slightly intensified, says flavor chemist Andrea Burdack-Freitag of the Frauenhofer Institute for Building Physics in Holzkirchen.

She and her colleagues asked 30 taste testers to rate their perceptions of different foods and wine while sitting in a partial Airbus A310 in a chamber with adjustable pressure. At ground pressures, tasters perceived tomato juice as musty, but at a low pressure typical in flight they found it fruitier, with cool notes. The complex aromas picked up by the nose that give coffee its flavor were barely perceived at low pressure, unmasking caffeine's bitterness, Burdack-Freitag says. Lufthansa's catering arm, which sponsored the study, wants to use the data to improve its menus.

Damage to our amygdala can eliminate monetary loss aversion

mdbownds@wisc.edu (Deric Bownds) — Wed, 03 Mar 2010 10:30:00 +0000

Here is an interesting open access article from Ralph Adolphs and his colleagues:

Losses are a possibility in many risky decisions, and organisms have evolved mechanisms to evaluate and avoid them. Laboratory and field evidence suggests that people often avoid risks with losses even when they might earn a substantially larger gain, a behavioral preference termed “loss aversion.” The cautionary brake on behavior known to rely on the amygdala is a plausible candidate mechanism for loss aversion, yet evidence for this idea has so far not been found. We studied two rare individuals with focal bilateral amygdala lesions using a series of experimental economics tasks. To measure individual sensitivity to financial losses we asked participants to play a variety of monetary gambles with possible gains and losses. Although both participants retained a normal ability to respond to changes in the gambles’ expected value and risk, they showed a dramatic reduction in loss aversion compared to matched controls. The findings suggest that the amygdala plays a key role in generating loss aversion by inhibiting actions with potentially deleterious outcomes.

Oxytocin may improve autism

mdbownds@wisc.edu (Deric Bownds) — Wed, 03 Mar 2010 10:25:00 +0000

I have done a large number of posts on behavioral effects of oxytocin, the 'trust hormone', notably in human studies that use an oxytocin inhaler (enter oxytocin in the blog search box in the left column to display them). Recent studies are now suggesting that when some autistic people (who have difficulty interacting with others) inhale oxytocin, they began looking at people in the eye and recognizing social concepts like fairness in a computer game.

Behavioral Addictions in the proposed DSM-V

mdbownds@wisc.edu (Deric Bownds) — Tue, 02 Mar 2010 10:35:00 +0000

I am increasingly amazed at the creeping "pathologicalization" of behaviors that vary a bit from the 'normal'. Almost any repetitive activity or habit could be construed as a behavioral addition (Tiger Wood's golf and sex?). I might well be considered an alcoholic sociopathic sex addict by some, given my one a day knockout happy hour drink, my extremely active libido, and my ability to observe the generation of my emotional and social behaviors and halt or detach from them when necessary. I though this article by Constance Holden had some interesting chunks, which I pass on here (see also the related previous post yesterday on the Bonkers institute):

"...proposed revisions for the American Psychiatric Association's (APA's) Diagnostic and Statistical Manual of Mental Disorders (DSM) include for the first time "behavioral addictions"—a change some say is long overdue and others say is still premature...

"Sex addiction" has received a lot of press lately, but O'Brien [University of Pennsylvania, chair of the addictions work group for DSM-V] says his work group found "no scientific evidence" that sex qualifies. APA psychiatrist Darrel Regier, co-chair of the DSM task force, says "it's not clear that reward circuitry is operative in the same way as in addictive areas." Nonetheless, a near equivalent may make it into the sexual disorders section of DSM: That work group is proposing a controversial new diagnosis of "hypersexual disorder."

The DSM teams have also tussled with the often-blurry line between addictions and compulsions. "I used to think [addictions] overlapped with OCD [obsessive-compulsive disorder]," says O'Brien. But new data from both brain-imaging and treatment studies suggest "more dissimilarities than similarities."

In another major change, O'Brien's group recommends dropping categories of "abuse" and "dependence" and labeling all problems major and minor as substance "use disorders" (or "disordered gambling"). Since the late 1980s, says O'Brien, "numerous large population studies" have shown there's no "breakpoint" where "abuse" becomes something more serious. He also says the term "dependence" only implies physiological dependence, which is not the same as the psychological obsession of addiction.

Some longtime addiction researchers, such as psychiatrist Victor Hesselbrock of the University of Connecticut, Farmington, have qualms about the direction DSM is moving. Hesselbrock believes behavioral addictions are dicey territory and prefers to limit the term "addiction" to substances, which are "pathogens we can identify." He also objects to fusing all drinking problems into "alcohol use disorder." Hesselbrock says he and others think there are proven subcategories of alcoholism that would aid both in treatment and discovering causes. "When you do a one-size-fits-all type of classification system," he says, "that will fit a lot of people but not so well."

Our thalamus goes to sleep before our cerebral cortex

mdbownds@wisc.edu (Deric Bownds) — Tue, 02 Mar 2010 10:33:00 +0000

Magnin et al. have recorded thalamic and cortical activities simultaneously in epileptic patients chronically implanted with intracerebral electrodes to address the issue of when these two regions of the brain go to sleep. (The thalamus is the main gateway through which information from our bodies flows to the cortex.) They find, contrary to the common view, that the thalamus deactivates well before the cortex during sleep onset, leaving the cortex to spin its stories without input from the world during a hypnagogic or half-awake state during which illusions or inspirations sometimes occur, giving us the impression that it is taking us longer to get to sleep than is actually the case. Here is their abstract:

Thalamic and cortical activities are assumed to be time-locked throughout all vigilance states. Using simultaneous intracortical and intrathalamic recordings, we demonstrate here that the thalamic deactivation occurring at sleep onset most often precedes that of the cortex by several minutes, whereas reactivation of both structures during awakening is synchronized. Delays between thalamus and cortex deactivations can vary from one subject to another when a similar cortical region is considered. In addition, heterogeneity in activity levels throughout the cortical mantle is larger than previously thought during the descent into sleep. Thus, asynchronous thalamo-cortical deactivation while falling asleep probably explains the production of hypnagogic hallucinations by a still-activated cortex and the common self-overestimation of the time needed to fall asleep.