The pathological, involuntary imitation of another person’s behavior. This condition may be present in people with autism or Tourette’s syndrome, but not always.
Example: You scratch your ear and observe the patient doing the same; no matter what you do, he mechanically continues to copy your actions.
Here is a great resource about the distinction between voluntarily imitating and compulsively having to imitate: http://www.wisegeek.com/what-is-echopraxia.htm
Fournier, G. (2010). Echopraxia. Psych Central. Retrieved on November 25, 2015, from http://psychcentral.com/encyclopedia/2008/echopraxia/