Echo phenomenon is automatic imitative actions wihtout explicit awareness, or pathological repetitions of external stimuli or activities, actions, sounds, or phrases, indicative of an underlying disorder.

• Echolalia, of vocalizations, the most common
• Echopraxia, of actions
• Echomimia, of facial expressions
• Echographia, in writing
• Echoplasia, physically or mentally, tracing contours of objects
• Echolalioplasia, involving sign language, described in 1 individual with Tourette syndrome