Etymology: Greek "echo (repetition)" and "praxia (action)". Etymology is the study of the origins of words. ...

Echopraxia is the involuntary repetition or imitation of the observed movements of another. Even though it is considered a tic, it is a behaviour characteristic of some people with autism, Tourette syndrome, schizophrenia (especially catatonic schizophrenia), some forms of clinical depression and some other neurological disorders. A tic is a repeated, impulsive action, almost reflexive in nature, which the actor feels powerless to control or avoid. ... It has been suggested that Autism mercury be merged into this article or section. ... Tourette syndrome (also called Tourettes syndrome, Tourettes disorder, Gilles de la Tourette syndrome, GTS or TS) is an inherited neurological disorder with onset in childhood, characterized by the presence of multiple motor tics and at least one phonic tic, which characteristically wax and wane. ... This is a page about catatonic state. ... Clinical depression is a state of sadness, melancholia or despair that has advanced to the point of being disruptive to an individuals social functioning and/or activities of daily living. ...