Echophenomenon (also known as echo phenomenon; from Ancient Greek ἠχώ (ēkhṓ) "echo, reflected sound") is "automatic imitative actions without explicit awareness" or pathological repetitions of external stimuli or activities, actions, sounds, or phrases, indicative of an underlying disorder.
The echophenomena include repetition:
echolalia (syn. echophrasia) – of vocalizations (the most common of the echophenomena)
echoplasia – physically or mentally, tracing contours of objects
echolalioplasia – involving sign language, described in one individual with Tourette syndrome (as of 2012[update]).
References
12345Ganos C, Ogrzal T, Schnitzler A, Münchau A (September 2012). "The pathophysiology of echopraxia/echolalia: relevance to Gilles de la Tourette syndrome". Mov. Disord. 27 (10): 1222–9. doi:10.1002/mds.25103. PMID22807284.
↑Lang AE, Consky E, Sandor P (1993). ""Signing tics"--insights into the pathophysiology of symptoms in Tourette's syndrome". Ann Neurol. 33 (2): 212–5. doi:10.1002/ana.410330212. PMID8434883.