AbstractImitative reactions in 11 infants, 14–21 days old, were observed. Stimuli were presented by the infant's mother, who protruded her tongue, opened her mouth, or interacted spontaneously. No conclusive overall group effects of the modeled action were found. However, when the responses of the infants were matched with the mothers' judgments concerning whether imitation had occurred, 6 infants showed imitative responses. It is concluded that observations on early imitation are influenced by individual differences between infants and that there may exist two different subgroups: High and low imitator