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The impact of trauma is located in the survival part of the brain, which does not return to baseline after the threat is over. This part of the brain is by definition unreasonable—you do not stop being hungry by reminding yourself how fat you are, and it’s pretty difficult to talk yourself out of being angry, shut down, or in love.

One of the most devastating effects of trauma is that people’s biology changes into a biology of threat; this is expressed on multiple levels, in stress hormones, immunology and what the brain selects to pay attention to. The intrinsic reward system changes, as do “attractors”—what turns you on or leaves you cold. As a consequence, traumatized... See more

These experiences leave traces on people’s biology and identity and have devastating social consequences–medical illnesses, problems with school and work performance, drug addiction and a variety of psychiatric illness. In fact, the Centers for Disease Control and Prevention calculate that childhood trauma is our single largest public health... See more

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