Echopraxia

Involuntary imitation of another person's actions

Echopraxia is the involuntary repetition or imitation of another person's actions. Similar to echolalia, the involuntary repetition of sounds and language, it is one of the echophenomena. It has long been recognized as a core feature of Tourette syndrome, and is considered a complex tic, but it also occurs in autism spectrum disorders, schizophrenia and catatonia, aphasia, and disorders involving the startle reflex such as latah. Echopraxia has also been observed in individuals with epilepsy, dementia and autoimmune disorders; the causes of and the link between echopraxia and these disorders is undetermined.

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