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Infants' Use of Synchronized Visual Information to Separate Streams of Speech


concerning this article should be addressed to George Hollich, Department of Psychological Sciences, 703 Third St, Purdue University, West Lafayette, IN 47907-2004. Electronic mail may be sent to


In 4 studies, 7.5-month-olds used synchronized visual–auditory correlations to separate a target speech stream when a distractor passage was presented at equal loudness. Infants succeeded in a segmentation task (using the head-turn preference procedure with video familiarization) when a video of the talker's face was synchronized with the target passage (Experiment 1, N=30). Infants did not succeed in this task when an unsynchronized (Experiment 2, N=30) or static (Experiment 3, N=30) face was presented during familiarization. Infants also succeeded when viewing a synchronized oscilloscope pattern (Experiment 4, N=26), suggesting that their ability to use visual information is related to domain-general sensitivities to any synchronized auditory–visual correspondence.