Brain and Nervous System: How Conditions Change Your Brain

When you go through something traumatic, your brain triggers a “flight-or-fight” response. Most people recover on their own, but some get posttraumatic stress disorder. PTSD causes your amygdala — the part of the brain that controls emotions — to be overactive. And it lowers activity in your prefrontal cortex, a decision-making area. It can also shrink your hippocampus, which forms memories.

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