By Renée Grinnell

Unusual immobility of posture and decreased sensitivity to pain. Causes include nervous disorders, Parkinson’s disease, epilepsy, and extreme shock, among others.

Example: A patient is observed standing immobile in a busy corridor for over an hour without regard to surroundings or passers by.

    Last reviewed: By John M. Grohol, Psy.D. on 6 Oct 2008