Echophenomenon

Echophenomenon (also known as echo phenomenon; from Ancient Greek ἠχώ (ēkhṓ) "echo, reflected sound") is "automatic imitative actions without explicit awareness"^[1] or pathological repetitions of external stimuli or activities, actions, sounds, or phrases, indicative of an underlying disorder.^[2][3]

The echophenomena include repetition:^[1]

• echolalia (syn. echophrasia) – of vocalizations (the most common of the echophenomena)^[1]
  • echopalilalia – of words^[4]
  • echothanatologia - of words centered on death, described in a review of grief in the context of neurodevelopmental disorders^[5]
• echopraxia (syn. echokinesis, echomatism^[4]) – of actions, movements
  • echothanatopraxia - of actions related to the cause of death ^[5]
• echopathy – of actions or speech^[4]
• echoplasia – physically or mentally, tracing contours of objects^[1][3]
• echolalioplasia – involving sign language, described in one individual with Tourette syndrome (as of 2012^[update]).^[1][6]