Speech-like vocalized lip-smacking in geladas

social imitation in autism [7], but further testing of the circumstances that drive children with autism to imitate would be valuable. Overall, our study leads to two important conclusions. First, studies of social interaction can examine the social component of imitation behaviour independent of the objectlearning component, and this can best be done using familiar objects. Second, children with autism do not show overimitation of actions on familiar objects. This specific difference in a behaviour linked to social affiliation and norm conformity is compatible with claims of abnormal social motivation in autism.