Infants' use of auditory information in guiding their search behavior is examined in this study. The subjects were two groups of 9-month-old crawling infants. Group 1 consisted of 24 infants and Group 2 of 16 infants. The auditory stimuli was the mother's voice. Infants in both groups were initially positioned by their mothers behind a screen in a room with two doorways. Once the mothers had surreptitiously left the room, the infants were lured out from behind the screen by two toys placed in the center of the room. Thirty seconds after the infants reached the toys, their mothers called out to them. In Group 1, the mothers called every 30 seconds until the infants began to crawl to one of the two doorways. In Group 2, the mothers called only once. Results from the first trial indicate that infants are capable of using maternal sound cues in guiding their search behavior. There was, however, a significant decline in successful search behavior in the second trial in which the mothers departed through the doorway not used in trial one. The infants' visual behavior--amount of time spent looking at the two open onset of crawling--was also briefly studied. (Author/JA)