An experiment was designed to demonstrate that infants as young as 3 months of age would show face/voice coordination in matched and mismatched conditions if exposure trials were extended to 1 minute in duration. A total of 16 infants participated in each of four experimental conditions. Conditions were (1) mother present with mother's voice broadcast; (2) stranger present with stranger's voice broadcast; (3) mother present with stranger's voice broadcast; and (4) stranger present with mother's voice broadcast. In all conditions, the "speaker" moved her lips in synchrony with the taped message but did not speak aloud. Each condition was tested twice, and the eight trials were counterbalanced. Data were reduced from videotapes by two independent judges. Attention, vocalization, and subjective measures were analyzed by a repeated measures analysis of variance. Findings showed that, overall, infants appeared significantly more upset during mismatched conditions and significantly more happy during matched conditions. In contrast to previous findings, it was concluded that, given an adequate length of exposure, infants younger than 8 months of age will react with differential attention and distress to mother/stranger face/voice mismatches. (RH)