THE NEUROBIOLOGY OF SEXUAL ASSAULT
"Now, I've been talking so far about fight-or-flight. It's actually fight, flight, or freeze — that for some victims, they don't fight back. They don't flee the situation. Their body freezes on them because of this hormonal activation by the HPA axis. And it can trigger essentially an entire shutdown in the body. And the technical name for this is tonic immobility. Tonic immobility is often referred to as 'rape-induced paralysis.'
It is an autonomic response, meaning that it's uncontrollable. This is not something a victim decides to do. It is a mammalian response. It is evolutionarily wired into us to protect the survival of the organism. Because sometimes the safest thing to do to protect the safety is to fight back. Sometimes the safest thing to do is to flee. Sometimes the stupidest thing to do is to flee because it will incite chase. Therefore, our bodies have been wired for a freeze response too — to play dead, to look dead, because that may be the safest thing for the survival of the organism. So it is a mammalian response that is in all of us — we can't control it. And it happens in extremely fearful situations."