Word: cortexes
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Dates: during 2000-2009
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...studies showing that when blacks and whites are flashed pictures of faces from the other race so quickly that the subjects weren't consciously aware of seeing them, their amygdalae reacted predictably. When the images were flashed more slowly so that subjects could process them consciously, the anterior cingulate cortex and the dorsolateral prefrontal cortex--regions that temper automatic responses--kicked...
...part of the brain that helps you know where the light switch is in your bathroom even if you can't see it in the middle of the night. The very last part of the brain to be pruned and shaped to its adult dimensions is the prefrontal cortex, home of the so-called executive functions - planning, setting priorities, organizing thoughts, suppressing impulses, weighing the consequences of one's actions. In other words, the final part of the brain to grow up is the part capable of deciding, I'll finish my homework and take out the garbage, and then...
...hard to get a teenager off the couch and working on that all important college essay? You might blame it on their immature nucleus accumbens, a region in the frontal cortex that directs motivation to seek rewards. James Bjork at the National Institute on Alcohol Abuse and Alcoholism has been using fMRI to study motivation in a challenging gambling game. He found that teenagers have less activity in this region than adults do. "If adolescents have a motivational deficit, it may mean that they are prone to engaging in behaviors that have either a really high excitement factor...
Schizophrenia, on the other hand, makes its appearance at about the time the prefrontal cortex is getting pruned. "Many people have speculated that schizophrenia may be due to an abnormality in the pruning process," says Teicher. "Another hypothesis is that schizophrenia has a much earlier, prenatal origin, but as the brain prunes, it gets unmasked." MRI studies have shown that while the average teenager loses about 15% of his cortical gray matter, those who develop schizophrenia lose as much...
...creates within brain circuitry the ability to pay attention. When you look at kids playing, adults see it as a waste of time. They have no clue what play does. Vigorous social play stimulates the growth of brain cells in the executive portion of the brain in the frontal cortex, and that lays the foundation for the circuitry of self-regulation, which is what you need to pay attention when you're at school. I'll just give you a very, very clear little example. We're talking about free play, not play that's monitored by adults. Because...