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Dendrite branching11/6/2022 ![]() ![]() Not only is it full-grown in size, Giedd explains, but “in a lot of psychological literature, traced back to Piaget, the highest rung in the ladder of cognitive development was about age 12 - formal operations.” In the past, children entered initiation rites and started learning trades at about the onset of puberty. “And the adolescent studies have been the most surprising of all.”īefore the imaging studies by Giedd and his collaborators at UCLA, Harvard, the Montreal Neurological Institute and a dozen other institutions, most scientists believed the brain was largely a finished product by the time a child reached the age of 12. “It turned out that normal brains were so interesting in themselves,” he marvels. In a way, the vast project that has become his life’s work is nothing more than an attempt to establish a gigantic control group. Giedd started out investigating the developmental origins of attention-deficit/hyperactivity disorder (ADHD) and autism (“I was going alphabetically,” he jokes) but soon discovered that so little was known about how the brain is supposed to develop that it was impossible to figure out where things might be going wrong. For each volunteer, he creates a unique photo album, taking MRI snapshots every two years and building a record as the brain morphs and grows. Giedd, 43, has devoted the past 13 years to peering inside the heads of 1,800 kids and teenagers using high-powered magnetic resonance imaging (MRI). ![]() Jay Giedd (pronounced Geed), chief of brain imaging in the child psychiatry branch at the National Institute of Mental Health. ![]()
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