Deficits involving phonology, the sound system of language, are seen in a large subset of individuals with autism. There is also behavioral evidence for phonological processing deficits in the unaffected first-degree relatives of individuals with autism. Using magnetoencephalography (MEG) and magnetic resonance imaging (MRI), the study will investigate the temporal dynamics and spatial localization of phonological processing in parents of children with autism and in adults with autism. In addition, several behavioral measures of phonological processing will be collected. By examining the brain mechanisms underlying phonological processing in parents of children with autism and in adults with autism, this research aims to identify a neurophysiological biomarker of the language deficits seen in autism. A biomarker of structural language deficits could be used to guide and strengthen future genetic studies of autism. It would also allow for subgroup identification to aid clinical interventions.