Meaningless repetition of another person’s vocalizations. Typically occurs in patients with autism, schizophrenia, Tourette syndrome, and other disorders.
Example: You greet a new patient by asking, “How are you feeling today?” He replies, “Today? Feeling today? How are YOU feeling today?”
This website focuses on autism and echolalia: http://www.autism-help.org/communication-echolalia-autism.htm