catatonia

The state of a person with a mental disorder who seems detached from reality and oblivious to environmental stimuli. Typically, catatonic people move very slowly and rigidly or may be stiff and statuelike. On some occasions and with no apparent provocation, their movements may become active and uncontrolled, and their moods may become excited. This is usually followed by a return to the more-characteristic state of stupor. See also waxy flexibility.