Scientific American - Mind Matters

Take two video games and call me in the morning

Tue, 30 Jun 2009 09:00:00 EST

Parents often complain that their children are spending increasing amounts of time playing computer-based video games. Kids get together and just sit in front of a computer or a television with a gaming console, and they do not talk to each. They just watch the screen, which is probably damaging to their eye sight. They don’t get out enough and do not get enough exercise. Etc.

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Can Alzheimer's Be Cured?

Tue, 23 Jun 2009 07:00:00 EST

P. Murali Doraiswamy is the head of biological psychiatry at Duke University and is a Senior Fellow at Duke’s Center for the Study of Aging. He’s also the co-author of The Alzheimer’s Action Plan, a guide for patients and family members struggling with the disease. Mind Matters editor Jonah Lehrer chats with Doraiswamy about recent advances in Alzheimer’s research and what people can do to prevent memory loss. [More]

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The Sound of Passion

Tue, 16 Jun 2009 08:00:00 EST

Imagine a quiet night like any other. Suddenly, your infant’s cries break the silence. Fully loaded with emotion, the sound triggers an urge to stand up and run to your infant’s room. But, considering that your spouse is a musician and you are not, who will be the first to reach the crib?

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Mirroring Behavior

Tue, 09 Jun 2009 09:00:00 EST

Eighteen years ago, in a laboratory at the University of Parma in Italy, a neuroscientist named Giacomo Rizzolatti and his graduate students were recording electrical activity from neurons in the brain of a macaque monkey. It was a typical study in neurophysiology: needle thin electrodes ran into the monkey’s head through a small window cut out of its skull; the tips of the electrodes were placed within individual neurons in a brain region called the premotor cortex. At the time, the premotor cortex was known to be involved in the planning and initiation of movements, and, just as Rizzolatti expected, when the monkey moved its arm to grab an object the electrodes signaled that premotor neurons were firing. And then, neglecting to turn off their equipment, Rizzolatti and his team got lunch. [More]

You Know More than You Think

Tue, 02 Jun 2009 09:00:00 EST

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Meditation on Demand

Tue, 26 May 2009 06:00:00 EST

In the fall of 2005, the Dalai Lama gave the inaugural Dialogues between Neuroscience and Society lecture at the Annual Meeting of the Society for Neuroscience in Washington, DC. There were over 30,000 neuroscientists registered for the meeting, and it seemed as if most of them attended the talk. The Dalai Lama’s address was designed to highlight the areas of convergence between neuroscience and Buddhist thought about the mind, and to many in the audience he clearly achieved his objective. There was some controversy over his being invited to deliver this lecture insofar as he is both a head of state and a religious leader, and for that reason he largely stuck to his prepared text. But he strayed from the text at least once, reminding the audience that not only was he a Buddhist monk but also an enthusiastic proponent of modern technology.

Elaborating, he shared a confidence with the audience, telling the audience of scientists that meditating was hard work for him (even though he meditates for 4 hours every morning), and that if neuroscientists were able to find a way to put electrodes in his brain and provide him with the same outcome as he gets from meditating, he would be an enthusiastic volunteer. It turns out that a recent set of experiments, from researchers at MIT and Stanford, moves us a step closer to making his wish a reality.

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With a wave of the hand

Tue, 19 May 2009 09:00:00 EST

Go into any busy coffee shop and you are likely to see people engrossed in conversation, waving their hands around. A man at the counter describes the coffee he wants to buy – in a mug, not a to-go cup – and his hand takes a familiar shape, as if he were already holding the cozy mug. Nearby, two sisters laugh, as one tells a story about a trip to the barrier reef and all of the fish that she saw, her hands wiggling and darting in an invisible sea in front of her. The drive to gesture when speaking is fundamental to human nature.

If you have thought about why we gesture you probably assumed that we gesture to help others understand what we are saying. Pretending to hold a ceramic mug can help the barista understand exactly which mug you want. Showing how the fish darted to and fro can help your sister get a more vivid picture of what the reef looked like to you.

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When Senses Intersect

Tue, 12 May 2009 00:00:00 EST

Dr. Richard Cytowic is one of the leading researchers of synesthesia, a condition in which two normally separated sensations - such as sight and sound, or touch and taste - occur at the same time. As a result, a synesthetic person might experience the taste of a dish on her fingertips, or be convinced that the letter X is a vibrant turquoise. Mind Matters editor Jonah Lehrer chats with Cytowic about his new book, Wednesday is Indigo Blue, which he co-wrote with David Eagleman.

LEHRER: What first got you interested in synesthesia?

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The Look of a Winner

Tue, 05 May 2009 09:00:00 EST

When we walk into a voting booth and cast our vote, we like to think that we are making a considered decision, based on the issues. After all, a properly functioning democratic system, which gives its citizens the power to choose their leaders and shape critical policies, requires that voters are, for the most part, rational and that society can trust them to make sound judgments.

Perhaps partly for this reason, choosing competent leaders is considered too important to be left to minors, which is why most democracies only allow their adult citizens to vote. You wouldn’t think, therefore, that a group of children would be able to predict the outcome of elections in another country, based only on photos of the candidates.

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Brain Games: Do They Really Work?

Tue, 28 Apr 2009 11:00:00 EST

Do you misplace your keys or regularly miss appointments? Do you often forget the names of people you know well? Do you feel like your memory is slowly getting worse? If so, then you may find yourself considering those brain games advertised everywhere. Sales pitches such as “where the sweat is figurative, but results are real” and “your brain will thank you” are amusingly alluring. But you may find yourself wondering whether they are really worth the time and expense. You shell out the money, play a few rounds and your brain will start spitting out names, dates and pin numbers like you’re 18 again--right? [More]

Come Together: Our Need to Cooperate

Tue, 21 Apr 2009 07:00:00 EST

The natural world seems intent on synchronizing. Schools of fish, flocks of birds, herds of wildebeest, and swarms of fireflies all effortlessly coordinate their actions with one another. A recent study published by Scott Wiltermuth and Chip Heath of Stanford University in the journal Psychological Science, suggests that humans are no different. In fact, our ability to synchronize might be one of the most important developments in our evolution as a social species, a skill we need to successfully choreograph our dance moves at parties--and also, perhaps, to live together in stable, cooperative societies.

Examples of the power of human synchrony abound--from the awe-inspiring opening ceremony of the 2008 Summer Olympics to the fear-inspiring Nazi military march, to the ridiculous communal dances in which we find ourselves at weddings. Who hasn’t bad-mouthed the chicken dance in the buffet line and then been drawn in by that insufferable staccato? Like a Siren, the allure of synchrony pulls you into the group.

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The Mind-Body Problem

Tue, 14 Apr 2009 17:00:00 EST

If people told you that they wanted to have a perfectly good leg amputated, or that they have three arms, when they clearly do not, you would probably think that they are mentally disturbed. Psychiatrists, too, long considered such conditions to be psychological in origin. Voluntary amputation, for example, was regarded as a fetish, perhaps arising because an amputee's stump resembles a phallus, whereas imaginary extra limbs were likely to be dismissed as the products of delusions or hallucinations.

These bizarre conditions--named body integrity and identity disorder (BIID) and supernumerary phantom limb, respectively--are now believed to have a neurological basis, and a growing body of literature suggests that such body awareness disorders occur as a result of abnormal activity in the right superior parietal lobule (SPL). This brain region integrates different types of sensory information and processes it further to generate an internal model of the body. Two forthcoming studies provide strong evidence that the gross distortions of body image experienced in both conditions do indeed occur as a result of SPL dysfunction.

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Do Parents Matter?

Thu, 09 Apr 2009 07:00:00 EST

In 1998 Judith Rich Harris, an independent researcher and textbook author, published The Nurture Assumption: Why Children Turn Out The Way They Do. The book provocatively argued that parents matter much less, at least when it comes to determining the behavior of their children, than is typically assumed. Instead, Harris argued that a child’s peer group is far more important. The Nurture Assumption has recently been reissued in an expanded and revised form. Mind Matters editor Jonah Lehrer chats with Harris about her critics, the evolution of her ideas and why teachers can be more important than parents.

LEHRER: Freud famously blamed the problems of the child on the parents. (He was especially hard on mothers.) In The Nurture Assumption, an influential work that was published 10 years ago, you argued that parents are mostly innocent and that peers play a much more influential role. What led you to write the book?

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The Neuroscience of Yoricks's Ghost and Other Afterimages

Tue, 07 Apr 2009 11:00:00 EST

Alas! Poor Yorick. I knew him well. A fellow of infinite jest, of most excellent fancy; he hath borne me on his back a thousand times; and now, how abhorred in my afterimage he is!

Well… that’s what Hamlet would have said, had he been holding the vintage Pear’s Soap advertisement bearing Yorick’s skull in the accompanying slide, rather than a dug up and rotting Danish cranium. In this antique illusion, you can stare at the X in Yorick’s left eye socket for about 10 to 30 seconds, then look away at a flat surface such as a piece of paper, wall, ceiling or sky, and you will see Yorick’s afterimage as a ghostly apparition.

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What Can Magicians Teach Us about the Brain?

Tue, 24 Mar 2009 07:00:00 EST

A magician tosses a ball into the air once, twice, three times. Suddenly, the ball vanishes in mid-flight. What happened?

Don’t worry, the laws of physics haven’t been broken. Magicians do not have supernatural powers; rather, they are masters of exploiting nuances of human perception, attention, and awareness. In light of this, a recent Nature Reviews Neuroscience paper, coauthored by a combination of neuroscientists (Stephen L. Macknik, Susana Martinez-Conde, both at the Barrows Neurological Institute) and magicians (Mac King, James Randi, Apollo Robbins, Teller, John Thompson), describes various ways magicians manipulate our perceptions, and proposes that these methods should inform and aid the neuroscientific study of attention and awareness. [More]

Building the 21st-Century Mind

Tue, 17 Mar 2009 07:00:00 EST

Howard Gardner is a professor of cognition and education at the Harvard Graduate School of Education. He’s also the author of over 20 books and several hundred scholarly articles. Gardner is probably best known in educational circles for his theory of multiple intelligences, which is a critique of the notion that there exists but a single human intelligence that can be assessed by standard psychometric instruments. His most recent book, Five Minds for the Future, offers some advice for policy-makers on how to do a better job of preparing students for the 21st century. Mind Matters editor Jonah Lehrer chats with Gardner about his new book, the possibility of teaching ethics and how his concept of multiple intelligences has changed over time. [More]

Clean and Virtuous: When Physical Purity Becomes Moral Purity

Tue, 10 Mar 2009 10:00:00 EST

When people are asked to list their favorite metaphor, they typically cite great works of poetry, literature or oratory. Indeed, many metaphors are born from creative insight--Romeo likening Juliet to the rising sun or poet Robert Burns comparing his love to a red rose. [More]

Does Eating Fewer Calories Improve the Brain?

Tue, 03 Mar 2009 07:00:00 EST

Hara hatchi bu, the Okinawan people’s habit of eating only till they are 80 percent full, is thought to be one of the secrets of their extraordinary health and longevity. In addition to one of the highest percentages of people in the world who live past 100, Okinawans appear to be less prone to heart disease, diabetes and obesity.

Indeed, ever since it was discovered in the 1930s that laboratory rats fed a caloric-restricted (CR) diet lived almost twice as long as their well fed counterparts, scientists have pursued caloric restriction research in the hopes of finding novel strategies for extending human life and preventing disease. Given the growing older population at risk for memory problems and the rising rates of obesity, the role of diet in maintaining peak brain performance has taken on added importance.

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Forget Survival of the Fittest: It Is Kindness That Counts

Thu, 26 Feb 2009 07:00:00 EST

Why do people do good things? Is kindness hard-wired into the brain, or does this tendency arise via experience? Or is goodness some combination of nature and nurture? [More]

Could Living in a Mentally Enriching Environment Change Your Genes?

Tue, 24 Feb 2009 10:00:00 EST

Giraffes’ long necks are perfectly suited to harvesting tender leaves beyond the reach of other herbivores. Pondering the genesis of this phenomenon, two giants of modern biology, Jean-Baptiste Lamarck and Charles Darwin, arrived at remarkably different hypotheses. Lamarck believed that constant stretching of the neck somehow stimulated its growth. The giraffe would then pass along this new trait to its offspring. In effect, this newer, longer neck was a direct result of a giraffe’s interaction with its environment. By contrast, Darwin’s theory posited that traits evolve as part of a random, gradual process. The giraffes that happened to have been born with longer necks thanks to a random genetic mutation were better fed and thus healthier than their shorter-necked counterparts, making them more likely to live long enough to breed and pass on this trait. Because this mutation conferred a specific advantage to long-necked giraffes that aided their survival, the trait was preserved in future generations. [More]