Among the most commonly reported symptoms of autism is heightened sensitivity to sensory stimuli. Children and adults with autism spectrum disorders often react with aversion to various sounds (e.g., by covering their ears and screaming) especially at an early age. The investigators believe that this is because autism spectrum disorders affect how sensory input is experienced. Therefore, the purpose of this study is to investigate sensory processing abnormalities in autism spectrum disorders, or, in other words, to evaluate how and why children and adults with autism spectrum disorders experience external sensory information (vision, audition, touch) differently than healthy children and adults.