Autism is a childhood disorder diagnosed primarily in the presence of severe social unresponsiveness in the first 3 years of life (Volkmar, 1987). Since speech exerts a prepotent attraction on the attention of normally developing infants, hence facilitating social engagement, we designed a technique to examine whether this inborn reaction could be at fault in young autistic children. They were given a choice between their mothers' speech and the noise of superimposed voices (a sound effect obtained in a busy canteen). Data were obtained utilizing a specially designed automated and computerized device which recorded the children's responses in their own homes. In contrast to comparison groups of mentally retarded and normally developing children who showed the expected strong preference for their mothers' speech, the autistic children actively preferred the alternative sound or showed a lack of preference for either audio segment. These results suggest that such abnormal reactions to speech are a feature of these children's overall disregard to people.