These alterations of consciousness are at the heart of constriction or numbing, the third cardinal symptom of post-traumatic stress disorder. Sometimes situations of inescapable danger may evoke not only terror and rage but also, paradoxically, a state of detached calm, in which terror, rage, and pain dissolve.
Herman establishes numbing/constriction as a definitive feature of PTSD, arising from dissociative alterations of consciousness that disconnect perception from meaning under conditions of inescapable threat.
, Trauma and Recovery: The Aftermath of Violence—From Domestic Abuse to Political Terror, 1992thesis