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Nov 302006
 

Daniel Gilbert’s book Stumbling on Happiness is not about happiness so much as it is about why our pursuit of happiness so often has disappointing results. Gilbert (Harvard College Professor of Psychology at Harvard University) presents quite a bit of well-organized information about the foibles of the human psyche and imagination in this witty and enjoyable book.

We think we know what will make us happy, and yet sometimes the things we work so hard for bring only brief contentment, if not disappointment or outright misery, if we finally manage to get them. Gilbert puts this in terms of our future selves, whose cholesterol levels and job satisfaction and financial comfort we spend so much time fretting over and for whom we give up so much present pleasure, yet who so often look back and shake their heads and wonder, “What on earth was I thinking?” The book is about why we so often misjudge what our future selves will find satisfying.

The short answer is that our minds are subject to various failings when we try to imagine our futures, similar to the optical illusions to which our eyes are subject. Gilbert wrote the book to explore the ways that these failures, which are consistent from human to human, illuminate the process of cognition about the future (which is, he says, the thing separating us from all the other animals on the earth).

In the first section of the book, Gilbert goes into some of the problems inherent in the study of something as subjective as feelings of happiness, and illustrates that although the subject is indeed fraught with difficulties, personal descriptions of present feelings are as accurate a report as we’re going to get, and these reports become scientifically useful when we gather large numbers of them for comparison and averaging.

Gilbert then groups human errors of imagination into three types and describes each type, complete with lots of interesting and often amusing evidence from psychological studies of human behavior.

The first type of error is that when we are filling in gaps in reality with something imagined, we do it so quickly and effortlessly that we don’t even realize we’re doing it. Gilbert gives a number of frankly disheartening examples of how flawed our perceptions of reality are, and how prone to interpolations based on suggestion or expectation. For example, the subjects in one experiment who heard the word “eel” preceded by a cough in a variety of sentences thought they heard either the word “heel” or the word “peel” depending on which word fit into the context of the sentence, even if they couldn’t determine which word would fit better until the end of the sentence and the word “eel” occurred near the beginning. Imagination also kicks in and colors our perceptions of what an event will mean—in other words, we interpret generic concepts like parties in a particular way, rather than realizing that there are multiple types of party—and this happens so automatically that we don’t realize that what we’re picturing might not match reality when the reality gets here.

The second type of error is that when our imagination is filling in the gaps for us, it doesn’t go all that far for its material, and so we tend to see the future as more like the present than it really will be. For example, if you’re like many Americans, at some point last Thursday evening you probably thought that you might never eat again after all that Thanksgiving turkey and stuffing and pie. Or at least it would be awhile before you felt like eating. But maybe by the end of the evening, or certainly by the next morning, there you were at the table as usual. Gilbert gives other examples of studies that show how our present experience unrealistically influences our concepts of what we will want to do in the future. We forget that the context will change in a variety of ways and our feelings will change with it.

The third error of imagination involves the ways we adapt to something once it has happened through a variety of rationalizations that we don’t foresee. This was also a fairly disheartening section; it seems that we view not reality but a filtered reality that our brain judges to be positive enough to keep us going but with enough negative feedback to allow us to change course when necessary. Gilbert uses our physiological immune system as an analog for the psychological immune system that balances our view of reality by, for example, finding good in the painful things that we don’t have much choice about. The whole book, but this section in particular, left me feeling a bit discouraged about how well we humans can grasp reality. On the one hand, we do manage to muddle through with what we’ve got, and the mental mechanisms that Gilbert talks about do have some positive consequences. But on the other hand, as with some of our anatomical features, our perceptions of the world sometimes seem to be those of a creature whose software and hardware still contain some bugs.

At the beginning of the book, Gilbert promises that later he will give us a solution to our problems of faulty forecasting, but that we almost certainly won’t make use of it. At the end of the book he suggests that the best way to determine whether a particular situation or course of action will make us happy is to look at people who are presently in that situation and see what they say about how happy they are. He closes with some discussion of why most people will reject this suggestion: basically, we think we’re more distinctive and individual and our situations are more peculiar than they are. It’s interesting that in the book he quotes Tim Wilson, who wrote an excellent book (Strangers to ourselves) about the many ways that our brains process information outside of conscious awareness, and how this subconscious processing influences our behavior without our being aware of it. Wilson makes a similar suggestion in his book, namely, that we can understand ourselves better not by trusting our own feelings and perceptions about who we are or what would be best for us, but by listening to what close and trusted family and friends say about us (he also predicted that people would not act on his suggestion).

Whether you take Gilbert’s advice or not, you’ll probably enjoy reading the book and learn some fascinating things about how your mind works.

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Nov 292006
 

Convergent evolution is what happens when two genetically distinct species independently evolve the same feature. The vivarium in the lobby of Jordan Hall at Indiana University illustrates convergent evolution (or used to, anyway; I haven’t looked at it in awhile); it contains Old World reptile species on one side and New World species on the other, often strikingly morphologically similar but genetically not related. A recent news story from New Scientist reports on a really nifty case of convergent evolution that involves primates and cetaceans. Whales have recently been found to possess spindle neurons, a particular type of brain cell involved in processing complex social and emotional information. Previously these cells were believed to occur only in us humans and our great ape cousins; it turns out that whales not only have them, but have had them for much longer than we have, and may have them in greater abundance than we do (even after you correct for the greater size of their brains). This is the latest in a string of discoveries about animals that are forcing us to rethink our ideas of our own uniqueness. The social behaviors of whales were a clue that maybe they had social and emotional lives of which we know little, and the discovery that they have spindle neurons indicates that they have some of the same equipment that we use to manage our connections to others. I wish I could believe that this would make it harder for people to hunt them.

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Nov 282006
 

Twenty-five years ago, back when I still went to church, I fell in with a group of Catholic charismatics. I hadn’t even known there was such a thing; I was raised in a strictly traditional Catholic family and the idea of Wednesday night prayer meeting was itself faintly exotic to me. So you can imagine how I felt when I encountered the phenomenon of speaking in tongues, which people in this prayer meeting did regularly. (Oddly, though, the charismatics and my parents shared a strong social conservatism, despite their liturgical differences.) I never knew what to make of glossolalia. I can picture my now ex-husband and I sitting beside each other on folding chairs in the church hall, exchanging furtive glances of astonishment and mild dismay the first time people burst into tuneful and lilting nonsense syllables. (What is the etiquette in such a situation, we wondered to each other later.) Most of the emotions people claimed to be feeling in the prayer group (a sense of divine love, a feeling of peace) frequently eluded me and in the end I think I figured that the whole thing was a mystery that I was never going to penetrate.

But that was before I gained my scientific sense of curiosity about what it was all about. Today it’s different, so I was interested in a recent story about glossolalia. Neuroscientists at the University of Pennsylvania have scanned the brains of people who were speaking in tongues to see which areas of the brain show increases or decreases in blood flow. Activity in the frontal lobes dropped compared to when the subjects were singing gospel songs, which indicates that the subjects had relinquished conscious control in some way, just as they felt they had. (I’m really curious, however, about how they were able to speak in tongues when they needed to.) A materialist like me would say that control has been passed to a different part of the brain, rather than to God. This press release talks about future work that will follow up on this research in an attempt to “demystify this fascinating religious phenomenon”. Which all makes perfect sense to me.

However, this excellent article in Slate quotes a New York Times article as saying that people who speak in tongues now have neuroscientific evidence for their claim that God is speaking through them. Seems like a huge leap to me. The Slate article talks about what it means when we find that our brain activity matches our first-person reports of what is happening to us—for example, when we feel we’re not in full intentional control and our brain activity reveals that indeed we are not, or when we report that we enjoy the taste of ice cream and brain scans reveal that by George, the pleasure centers are lighting up. I’m interested in the neural correlates of emotional states because I want to know how the brain works and how it got to be that way. I don’t think we’re going to find evidence for God in there. Or rather, I think we’re going to find the mechanisms that produce our thoughts and feelings about God and reveal that we’re creating the whole thing inside our heads. This article is interesting because the author (who says he used to scan brains for a living) says that what would be compelling from a religious point of view is if our brains didn’t reflect the experiences we say we’re having (so we would have to wonder where our feelings of religious rapture came from). Until that happens (and I would be very surprised if it did), there’s really no particular surprise that what’s happening on the inside matches what we report on the outside. It’s just cool to figure out how it all works.

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Nov 272006
 

Recently a couple of news stories came out about dendritic spines, a crucial part of the synaptical connections between neurons. A dendritic spine is a tiny, tiny projection on a dendrite, one of the many filaments that link a neuron to other neurons. In the synapses, the gaps between neurons, neurotransmitters are exchanged and much of the interesting business of the brain takes place. Dendritic spines cover most neurons like thick grass, and extend the surface area available for the receptors that bind neurotransmitters. Three recent papers by a group of researchers describe the functioning of dendritic spines. The group used some innovative imaging techniques to investigate the electrical activity of these infinitesimal but vital structures, and came to the conclusion that they act as electrical filters that give neurons the ability to sum up inputs linearly. These findings could help lay the groundwork for an understanding of how the brain performs its computations, including what role the spines play in learning and why human brains have a greater ability to learn. This press release from the Howard Hughes Medical Institute describes the work and the results.

The second news story describes some work that looked at how the synapses can be stable enough to hold our memories when they are in such chemical flux. The strength of our memories (and of our identities, to some degree, since who we think we are is based at least partly on our memories of ourselves and our lives) depends on the strength of the connections between neurons. Two researchers at the University of Utah found that the proteins that are essential for strengthening synaptical connections remain in place because of the presence of anchoring proteins that hold them there. You can read about it in this press release.

Thanks to Mark for passing along these two news stories.

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Nov 272006
 

I’ve been away for the Thanksgiving holiday, and a lot of Thinking Meat-type news has piled up while I was gone. To start the catch-up process, here’s a story from news@nature.com about how the human genome varies more from person to person than originally thought. Instead of focusing on SNPs (single nucleotide polymorphisms), in which a single “letter” of genetic code varies, a group of researchers has looked at something called copy-number variants, or CNVs, in which a piece of DNA that contains tens of thousands of letters appears a different number of times in different individuals—one copy in one person, two or three in another, none at all in a third, for example. An examination of the DNA of 270 people revealed a surprisingly large number of CNVs; it appears that the similarity between one person’s DNA and another’s is less than it was thought to be (maybe 99.5% similar rather than 99.9%). These CNVs are believed to be important in making us physically different (e.g., in our susceptibility to disease), although it sounds like we’re nowhere near being able to say what effect each one of them has.

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Nov 172006
 

David Barash, a University of Washington psychology professor, has written an essay for the Chronicle of Higher Education addressing the question of whether the young should be taught about evolutionary psychology despite the fact that learning about the evolutionary bases for non-altruistic behavior could have a demoralizing effect. After all, if nature rewards the selfish and competitive and greedy, why not be selfish, competitive, and greedy? It’s an interesting essay, although the point that he came to towards the end is where I might have started: We’re not at the mercy of our evolutionary history but have considerable choice in how we behave. It seems to me that evolutionary psychology is an attempt to describe how we got to be the way we are, but it certainly doesn’t prescribe the way we have to be. And what we are is a complicated mix of traits, good and bad. As Frans de Waal said at the end of Our inner ape, we’re a deeply conflicted species of primate, capable of both callous destruction and deep love and empathy. I don’t know if evolutionary psychology is routinely taught in such a way as to emphasize the former, but if it is it shouldn’t be. And in fact studying the full story of who we are is one way people can learn that even though we often fall short of our ideals for ourselves, we also rise far above our worst impulses.

I was also reminded of something E.O. Wilson said in On human nature about altruism. Wilson talks about hard-core and soft-core altruism. Hard-core altruism he defines as pure selfless giving, where you don’t get anything back. Soft-core altruism is the self-interested you-scratch-my-back-I’ll-scratch-yours behavior that is not altruistic in the strictest sense but that does help the world to get along. Because Wilson estimates that hard-core altruism is likely to have developed through selection working on family or tribal units, he would expect hard-core altruistic behavior to extend mostly toward those who are related or otherwise close to the altruist, and drop off sharply outside of the altruist’s circle of friends and family. Soft-core altruism, on the other hand, can in theory foster interactions between any two individuals who each possess something the other needs. I was struck by Wilson’s statement that the distinction between these two forms of altruism is important because “pure, hard-core altruism based on kin selection is the enemy of civilization.” This is because the demands of “blood and territory” will sooner or later disrupt efforts at cooperation on a large scale. He goes on to say that he is optimistic for the human race because “Human beings appear to be sufficiently selfish and calculating to be capable of indefinitely greater harmony and social homeostasis.” Maybe the character G’Kar in Babylon 5 was right when he described the universe as a complicated interaction between matter, energy, and enlightened self-interest.

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Nov 152006
 

While you sleep, your brain settles your memories more firmly; see this summary from Memory Key for some information about what we know about memory consolidation during sleep. The basic idea is that there is an exchange of information between your hippocampus, an evolutionarily older part of the brain that’s involved in storing short-term memory, and the neocortex, a newer brain structure that’s crucial for long-term memory storage. (I get an image of uploading a day’s work from the flash drive to the big backup hard drive.) Scientists at Brown University have come up with the best evidence yet that this information transfer takes place, and have learned some of the details about how it works (e.g., that the neocortex seems to be the initiator in the exchange). Here’s the press release from Brown. Thanks to Mark for passing this one along.

This press release from the University of California at Irvine describes some research into how the brain ties together all the details of a memory. Researchers used fMRI to watch brain activity when volunteers viewed words on a computer screen, and then looked at how the brain activity correlated to how well the volunteers were later able to recall the words, their color, and where they appeared on the screen. When people could remember only some of the details, e.g., just the color of a word or just the placement, only the part of the brain involved in processing that type of information was active. But when they remembered the word, its color, and its location, another part of the brain was active as well, the interparietal sulcus, which appears to pull together the details of a sensory experience into a unified whole.

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Nov 132006
 

I thought this press release about adolescent risk-taking had some interesting things to say. It’s a truism that young people seem to think they’re immune to the kind of harm that their elders more willingly avoid. However, research has shown that adolescents actually overestimate the degree to which they are at risk from hazards like STDs and car wrecks. Some recent work on decision making points to another possible reason that young people take risks that older adults do not: the younger adults might be taking the time to calculate the odds and then deciding to go ahead, whereas older people might be identifying a situation as risky, and thus best avoided, without making rational calculations about it. This idea is based on a study of the time it took younger people and older people to decide on the correct answer to some no-brainer questions about whether or not certain activities are unsafe. The adolescents came up with the right answer (no, it’s not a good idea to set your hair on fire) but took longer to do so (about 170 milliseconds longer). If it’s correct, the idea that rational processing can lead to worse decisions would jibe with other research that suggests that more intuitive, gestalt-type decision-making can be more successful than a rational weighing of the pros and cons.

Along the same lines, this press release from last week describes some research into whether people make good purchasing choices when they base their decisions on their emotional reaction to a product. In a series of experiments that examined both people’s behavior in lab simulations and their reports on real-life experiences, researchers determined that even with expensive things like houses and cars, acting on your gut feelings can result in a purchase that you’re happier with down the road.

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