The individual suffers from diminution or absence of voluntary movement and normal responsiveness to external stimuli such as light, noise, and touch.
The person lies or sits largely motionless for long periods of time.
Speech and spontaneous and purposeful movement are completely absent.
Muscle tone, posture, breathing, and sometimes eye-opening and coordinated eye movements are such that it is clear that the individual is neither asleep nor unconscious.
Positive evidence of psychogenic causation in the form of either recent stressful events or prominent interpersonal or social problems.