Saturday, November 26, 2011

Gender: Why Boys Keep Trucking

Getty Images
Innate fascination with propulsive motion may explain why boys gravitate to toys that move, like trucks.
After watching videos of adults cradling and striking balloons, male but not female 6-to-9-month-olds began to hit balloons more often. This suggests that males have an innate fascination with "propulsive movement," researchers say.
After getting acquainted with a toy balloon, 45 children—too young to label themselves by gender—watched split-screen video clips: On one side, a man or woman cradled a balloon; on the other, the same man or woman hit the balloon.
Boys tended to watch the people striking balloons more than girls did. After watching, they batted their own balloons more than before, while girls didn't change behavior.
There were no sex differences in how children handled the balloons before the videos started and no evidence that the parents of boys had promoted this play style.
If an innate fascination with propulsive motion exists, it may explain why boys gravitate to toys that move, such as trucks, without parental encouragement, researchers said.
"Male More Than Female Infants Imitate Propulsive Motion," Joyce F. Benenson, Robert Tennyson and Richard W. Wrangham, Cognition (November)

Tuesday, October 25, 2011

Friday, October 07, 2011

Evil: Neuroscientists suggest there is no such thing. Are they right?


By |Posted Friday, Sept. 30, 2011, at 4:24 PM ET

Anders Behring Breivik, suspect in the Oslo killings
Photo by Jon-Are Berg-Jacobsen/AFP/Getty Images.
Is evil over? Has science finally driven a stake through its dark heart? Or at least emptied the word of useful meaning, reduced the notion of a numinous nonmaterial malevolent force to a glitch in a tangled cluster of neurons, the brain?
Yes, according to many neuroscientists, who are emerging as the new high priests of the secrets of the psyche, explainers of human behavior in general. A phenomenon attested to by a recent torrent of pop-sci brain books with titles like Incognito: The Secret Lives of the Brain. Not secret in most of these works is the disdain for metaphysical evil, which is regarded as an antiquated concept that's done more harm than good. They argue that the time has come to replace such metaphysical terms with physical explanations—malfunctions or malformations in the brain.
Of course, people still commit innumerable bad actions, but the idea that people make conscious decisions to hurt or harm is no longer sustainable, say the new brain scientists. For one thing, there is no such thing as "free will" with which to decide to commit evil. (Like evil, free will is an antiquated concept for most.) Autonomous, conscious decision-making itself may well be an illusion. And thus intentional evil is impossible.
Have the new neuroscientists brandishing their fMRIs, the ghostly illuminated etchings of the interior structures of the skull, succeeded where their forebears from disciplines ranging from phrenology to psychoanalysis have failed? Have they pinpointed the hidden anomalies in the amygdala, the dysfunctions in the prefrontal lobes, the electrochemical source of impulses that lead a Jared Loughner, or an Anders Breivik, to commit their murderous acts?
And in reducing evil to a purely neurological glitch or malformation in the wiring of the physical brain, in eliminating the element of freely willed conscious choice, have neuroscientists eliminated as well "moral agency," personal responsibility? Does this "neuromitigation" excuse—"my brain made me do it," as critics of the tendency have called it—mean that no human being really wants to do ill to another? That we are all innocent, Rousseauian beings, some afflicted with defects—"brain bugs" as one new pop-neuroscience book calls them—that cause the behavior formerly known as evil?
Are those who commit acts of cruelty, murder, and torture just victims themselves—of a faulty part in the head that might fall under factory warranty if the brain were a car?

Wednesday, August 10, 2011

Fish oil to combat criminal behavior

Criminal Minds Are Different From Yours, Brain Scans Reveal

Tuesday, August 09, 2011

The biology of criminality

June 12, 2011

Criminal Minds

Adrian Raine thinks brain scans can identify children who may become killers

Can This Man Predict Whether Your Child Will Become a Criminal? 1
Jonathan Barkat for The Chronicle Review
A child in Adrian Raine's lab at the U. of Pennsylvania, wearing a cap with electrodes to measure brain activity.

By Josh Fischman

Along with several other researchers, he has pioneered the science of neurodevelopmental criminology. In adult offenders, juvenile delinquents, and even younger children, dozens of studies have pointed to brain features that seem to reduce fear, impair decision making, and blunt emotional reactions to others' distress. The studies have also highlighted body reactions that are signs of this pattern and are tied to criminality.

"So if I could tell you, as a parent, that your child has a 75-percent chance of becoming a criminal, wouldn't you want to know and maybe have the chance to do something about it?" asks Raine....

Society has always wondered about "bad seeds," people who seem to be possessed by devils. But what is emerging from this research is a cluster of biological markers that plant the bad seed in the brain. More striking, they appear to predict antisocial behavior even before it happens. Early warnings could avoid a world of hurt, because some of these people are terribly dangerous. . .

When they further divided murderers into those who came from "good" homes and those who came from "bad" homes—those filled with neglect, abuse, and poverty—the first group again showed lower activity in the prefrontal cortex, in particular an area called the orbitofrontal cortex. Raine's interpretation: Genetics and anatomy were more influential on their development than was the way they grew up; the murderers from good homes seemed to be terribly affected by this low-functioning brain region. 

And it wasn't just function. Brain form was also impaired, Raine and his coworkers found. A series of studies using magnetic resonance imaging, which reveals structures and shapes, showed that criminals and people who scored high on tests of antisocial disorders had different-looking brains. Both the orbitofrontal region and the amygdala were smaller than normal. And the corpus callosum, the bridge between the brain's two hemispheres that helps them communicate, was abnormally large....

In his current study of Philadelphia children with the slow physical reactivity that has been linked to trouble, some are getting a diet rich in omega-3 fatty acids and calcium to see if those protect brain cells, some are getting cognitive-behavioral therapy, and some are getting both to see if trouble can be staved off.
Still, the time is coming, Raine believes, when putting numbers on children will be tempting. If a 75-percent chance of a bad seed isn't high enough, he wonders, what about 80 percent? Or 95? "Look, I have two children, 9-year-old, nonidentical twin boys," he says. "And I'd definitely want to know, especially if there was a treatment that has a chance of success. But I realize not every parent will. We have to start having this conversation now, though, so we understand the risks and the benefits. It's easy to get on your moral high horse about stigma and civil liberties, but are you going to have blood on your hands in the future because you've blocked an approach that could lead to lives being saved?"
"One swallow does not a summer make. But together, this is a message in the sky."

Wednesday, June 22, 2011

Genetic Basis for Crime: A New Look

It was less than 20 years ago that the National Institutes of Health abruptly withdrew funds for a conference on genetics and crime after outraged complaints that the idea smacked of eugenics. The president of the Association of Black Psychologists at the time declared that such research was in itself  “a blatant form of stereotyping and racism.”

The tainted history of using biology to explain criminal behavior has pushed criminologists to reject or ignore genetics and concentrate on social causes: miserable poverty, corrosive addictions, guns. Now that the human genome has been sequenced, and scientists are studying the genetics of areas as varied as alcoholism and party affiliation, criminologists are cautiously returning to the subject. A small cadre of experts is exploring how genes might heighten the risk of committing a crime and whether such a trait can be inherited.    Readers' Comments

The turnabout will be evident on Monday at the annualNational Institute of Justice conference in Arlington, Va. On the opening day criminologists from around the country can attend a panel on creating databases for information about DNA and “new genetic markers” that forensic scientists are discovering.
“Throughout the past 30 or 40 years most criminologists couldn’t say the word ‘genetics’ without spitting,” Terrie E. Moffitt, a behavioral scientist at Duke University, said. “Today the most compelling modern theories of crime and violence weave social and biological themes together.”  
Researchers estimate that at least 100 studies have shown that genes play a role in crimes. “Very good methodological advances have meant that a wide range of genetic work is being done,” said John H. Laub, the director of the justice institute, who won the Stockholm Prize in Criminology last week. He and others take pains to emphasize, however, that genes are ruled by the environment, which can either mute or aggravate violent impulses. Many people with the same genetic tendency for aggressiveness will never throw a punch, while others without it could be career criminals.
The subject still raises thorny ethical and policy questions. Should a genetic predisposition influence sentencing? Could genetic tests be used to tailor rehabilitation programs to individual criminals? Should adults or children with a biological marker for violence be identified?
Everyone in the field agrees there is no “crime gene.” What most researchers are looking for are inherited traits that are linked to aggression and antisocial behaviors, which may in turn lead to violent crime. Don’t expect anyone to discover how someone’s DNA might identify the next Bernard L. Madoff.  ...
One gene that has been linked to violence regulates the production of the monoamine oxidase A enzyme, which controls the amount of serotonin in the brain. People with a version of the gene that produces less of the enzyme tend to be significantly more impulsive and aggressive, but, as Ms. Moffitt and her colleague (and husband) Avshalom Caspi discovered, the effect of the gene is triggered by stressful experiences. 
Steven Pinker, a professor of psychology at Harvard whose forthcoming book, “The Better Angels of Our Nature,” argues that humans have become less violent over the millenniums, suggests that the way to think about genetics and crime is to start with human nature and then look at what causes the switch for a particular trait to be flipped on or off.
“It is not a claim about how John and Bill differ, but about how every male is the same,” he said. Understanding the genetics of violence can “tell you what aspect of the environment you should look at.” 
He mentioned one of the biggest risk factors leading to crime: remaining single instead of getting married, a link uncovered by Mr. Laub and Robert J. Sampson, a Harvard sociologist who was a co-winner of the Stockholm Prize. Marriage may serve as a switch that directs male energies toward investing in a family rather than competing with other males, Mr. Pinker said.
Kevin Beaver, an associate professor at Florida State University’s College of Criminology and Criminal Justice, said genetics may account for, say, half of a person’s aggressive behavior, but that 50 percent comprises hundreds or thousands of genes that express themselves differently depending on the environment.
He has tried to measure which circumstances — having delinquent friends, living in a disadvantaged neighborhood — influence whether a predisposition to violence surfaces. After studying twins and siblings, he came up with an astonishing result: In boys not exposed to the risk factors, genetics played no role in any of their violent behavior. The positive environment had prevented the genetic switches — to use Mr. Pinker’s word — that affect aggression from being turned on. In boys with eight or more risk factors, however, genes explained 80 percent of their violence. Their switches had been flipped.
A rash of new research has focused on self-control as well as callousness and a lack of empathy, traits regularly implicated in the decision to commit a crime. Like other personality traits, these are believed to have environmental and genetic components, although the degree of heritability is debated. 
In findings from a long-term study of 1,000 babies born in 1972 in a New Zealand town, Ms. Moffitt and her colleagues recently reported that the less self-control a child displayed at 3 years of age, the more likely he or she was to commit a crime more than 30 years later. Forty-three percent of the children who scored in the lowest fifth on self-control were later convicted of a crime, she said, versus 13 percent of those who scored in the highest fifth.  
But a predisposition is not destiny. “Knowing something is inherited does not IN ANY WAY tell us anything about whether changing the environment will improve it,” Ms. Moffitt wrote in an e-mail. “For example, self-control is a lot like height, it varies widely in the human population, and it is highly heritable, but if an effective intervention such as better nutrition is applied to the whole population, then everyone gets taller than the last generation.”
Criminologists and sociologists have been much more skittish about genetic causes of crime than psychologists.  In 2008 a survey conducted by John Paul Wright, who heads graduate programs at the University of Cincinnati’s School of Criminal Justice, discovered that “not a single study on the biology-crime link has been published in dissertation form in the last 20 years” from a criminal justice Ph.D. program, aside from two dissertations he had personally overseen (one of which was Mr. Beaver’s). He also noted that the top four journals in the field had scarcely published any biological research in the past two decades.
Mr. Wright said he now thinks “in criminology the tide is turning, especially among younger scholars.”
But recent work has tended to air outside the main criminology forums. Mr. Beaver, for example, published a paper in Biological Psychiatry in February that concluded that adoptees whose biological parents had broken the law “were significantly more likely to be arrested, sentenced to probation, incarcerated, and arrested multiple times when compared with adoptees whose biological parents had not been arrested.”
At the American Association for the Advancement of Science’s meeting in February,Adrian Raine, chairman of the criminology department at the University of Pennsylvania and a pioneer in the field, presented a paper showing how variations in the parts of a toddler’s brain that regulate emotions — believed to be a product of genes and environment — turned out to be a good predictor of criminal behavior later in life.
Mr. Sampson, who planned to attend the opening day of the justice institute conference, said that “sociology has nothing to fear from genetic research,” but he maintained that the most interesting questions about crime, like why some communities have a higher crime rate than others, are not traceable at all to genetics. “The more sophisticated the genetic research, the more it will show the importance of social context,” he said.

Rule Breaker

When it comes to morality, the philosopher Patricia Churchland refuses to stand on principle

Excerpt:    Oxytocin's primary purpose appears to be in solidifying the bond between

 mother and infant, but Churchland argues—drawing on the work of biologists—that

 there are significant spillover effects: Bonds of empathy lubricated by oxytocin 

expand to include, first, more distant kin and then other members of one's in-group.

 (Another neurochemical, aregenine vasopressin, plays a related role, as do 

endogenous opiates, which reinforce the appeal of cooperation by making it feel good.)

From there, culture and society begin to make their presence felt, shaping larger moral systems: tit-for-tat retaliation helps keep freeloaders and abusers of empathic understanding in line. Adults pass along the rules for acceptable behavior—which is not to say "just" behavior, in any transcendent sense—to their children. Institutional structures arise to enforce norms among strangers within a culture, who can't be expected to automatically trust each other.

Sandy Huffaker for The Chronicle Review

The Biology of Ethics 1

These rules and institutions, crucially, will vary from place to place, and over time. "Some cultures accept infanticide for the disabled or unwanted," she writes, without judgment. "Others consider it morally abhorrent; some consider a mouthful of the killed enemy's flesh a requirement for a courageous warrior, others consider it barbaric."

Hers is a bottom-up, biological story, but, in her telling, it also has implications for ethical theory. Morality turns out to be not a quest for overarching principles but rather a process and practice not very different from negotiating our way through day-to-day social life. Brain scans, she points out, show little to no difference between how the brain works when solving social problems and how it works when solving ethical dilemmas....

Recognizing our continuity with a specific species of animal was a turning point in her thinking about morality, in recognizing that it could be tied to the hard and fast. "It all changed when I learned about the prairie voles," she says—surely not a phrase John Rawls ever uttered.

She told the story at the natural-history museum, in late March. Montane voles and prairie voles are so similar "that naifs like me can't tell them apart," she told a standing-room-only audience (younger and hipper than the museum's usual patrons—the word "neuroscience" these days is like catnip). But prairie voles mate for life, and montane voles do not. Among prairie voles, the males not only share parenting duties, they will even lick and nurture pups that aren't their own. By contrast, male montane voles do not actively parent even their own offspring. What accounts for the difference? Researchers have found that the prairie voles, the sociable ones, have greater numbers of oxytocin receptors in certain regions of the brain. (And prairie voles that have had their oxytocin receptors blocked will not pair-bond.)...

The biologist Sue Carter, now at the University of Illinois at Chicago, did some of the seminal work on voles, but oxytocin research on humans is now extensive as well. In a study of subjects playing a lab-based cooperative game in which the greatest benefits to two players would come if the first (the "investor") gave a significant amount of money to the second (the "trustee"), subjects who had oxytocin sprayed into their noses donated more than twice as often as a control group, giving nearly one-fifth percent more each time....