Atypical prosody is a characteristic feature of the communication deficit in autism spectrum disorders (ASD). Investigating disorders of prosody in autism is clinically important because disordered expressive prosody is an obstacle to social integration and communication for individuals with ASD and can be a life-long problem even when other areas of language improve. The goal of this project is to identify biomarkers for early detection of prosody disorders is autism. Using electroglottography (EGG), we will characterize voice quality in 2- to 3-year-old children with ASD, children with developmental delays and typically developing children. Subsequently, we will examine the relation of voice quality measures to clinical outcome measures for speech motor deficits and impairments in social interaction in ASD. This project will provide novel insights into the etiology of prosody disorders in ASD by investigating the role of physiological motor deficits and impaired social interaction in the production of disordered prosody. The results of this will project will be of benefit in developing objective measures that are successful and easy to administer for early screening and diagnosis of prosody deficits in ASD so as to expand the potential for early interventions in young children on the autism spectrum.