" The dissociative response is used when there is inescapable, unavoidable distress or pain. Your mind and body protect you. Because you cannot physically flee, and fighting is futile, you psychologically flee to your inner world. So going back to the infant with the disengaged parent, the infant’s fight or flight response is to cry. But if no one comes-or they come and are angry-the helpless infant will dissociative to survive this inescapable distressing situation. The same if true for children, youth, and adults faced with any inescapable, unavoidable pain and distress-they dissociate. And a whole set of neurophysiological changes helps you do that, including the release of your body’s own opiates. "

― Bruce D. Perry , What Happened To You?: Conversations on Trauma, Resilience, and Healing