Speech repetition is the saying by one individual of the spoken vocalizations made by another individual. This requires the ability in the person making the copy to map the sensory input they hear from the other person's vocal pronunciation into a similar motor output with their own vocal tract. Such speech input output imitation often occurs independently of speech comprehension such as in speech shadowing when a person automatically says words heard in earphones, and the pathological condition of echolalia in which people reflexively repeat overheard words...