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June 4, 2015
The brain’s foundation, frame, and walls are built in the womb. As an embryo grows into a fetus, some of its dividing cells turn into neurons, arranging themselves into layers and forming the first synapses, the organ’s electrical wiring. Four or five months into gestation, the brain’s outermost layer, the cerebral cortex, begins to develop its characteristic wrinkles, which deepen further after birth. It isn’t until a child’s infant and toddler years that the structures underlying higher-level cognition—will power, emotional self-control, decision-making—begin to flourish; some of them continue to be fine-tuned throughout adolescence and into the first decade of adulthood.
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