Examination of Differential Valuation of Leisure Items and Attention as Reinforcers in Children With Autism

Inclusion Criteria for Autism Spectrum Disorder (ASD) Group: * Between the ages of 3 and 6. * Presence of an autism diagnosis as determined by The Autism Diagnostic Observation Schedule (ADOS). * Adaptive functioning typical of autism as determined by the Vineland Adaptive Behavior Scales (VABS-II; survey interview form). * Completion of the Social Responsiveness Scale (SRS) to assess social impairment. * Completion of the Early Social Communication Scales to assess non-verbal communication. Inclusion Criteria for Typically Developing Group: * Between the ages of 3 and 6. * Current developmental level determined to be not developmentally delayed per The Mullen Scales of Early Learning (MSEL) or Differential Ability Scale (DAS; depending on participant age). Inclusion Criteria for Other Developmental Delays Group: * Between the ages of 3 and 6. * Current developmental level determined to be developmentally delayed per The Mullen Scales of Early Learning (MSEL) or Differential Ability Scale (DAS; depending on participant age). Exclusion Criteria for all groups: * Caregiver does not give permission for protective procedures and emergency protocols to be used if the child participant exhibits problem behaviors during a study visit. * Children who are not able to master the training trial within 10 sessions will not participate in the study.