Inclusion Criteria:  children with or without a diagnosis of ASD between 18 to 71 months of age  Exclusion Criteria:  native language is not English born premature (< 36 weeks) has uncorrected hearing or vision impairments has developmental disorders or medical conditions other than ASD that affect language or cognition (excepting psychiatric conditions often comorbid with ASD such as ADHD) has a history of photosensitive epileptic seizures