The very last part of the brain to get myelinated is the prefrontal cortex—the part of the brain responsible for reason, planning, and deliberation. So while teenage emotions have gone into hyperdrive, reason and logic are still obeying the speed limit. The result is that while teenagers can make decisions that are just as mature, reasoned, and rational as adults’ decisions in normal circumstances, their judgment can be fairly awful when they are feeling intense emotions or stress, conditions that psychologists call hot cognition. In those situations, teens are more likely to make decisions
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