What ethologists call tonic immobility—the paralysis and physical/emotional shutdown that characterize the universal experience of helplessness in the face of mortal danger—comes to dominate the person’s life and functioning.
Levine establishes tonic immobility as the biological core of traumatic paralysis, arguing that in humans, unlike animals, this temporary defensive state becomes a chronic, life-dominating condition.
, In an Unspoken Voice: How the Body Releases Trauma and Restores Goodness, 2010thesis