The ASD group consisted of 17 adults (12 male, M age = 27.6 years, age range = 18–42 years) with autism spectrum disorders. The age- and IQ- (Wechsler Adult Intelligence Scale, Version 3) matched control group consisted of 17 adults (14 male, M age = 26.3 years, age range = 20–44 years) without any developmental disorders. All participants in the ASD group had previously received clinical diagnoses of autism, Asperger syndrome, or pervasive developmental disorder not otherwise specified. One of the authors (MDR) confirmed their diagnoses with the Autism Diagnostic Observation Schedule (ADOS-G) Module 4. All participants had normal or corrected-to-normal letter acuity. Four additional participants with ASD were replaced because they failed to meet our criterion for performance on practice trials (see Procedure section for details) (n = 1), or because their response curves were too broad to allow confident estimation of the width of the cone of gaze (see Curve Fitting section for description of this measure) from their data for at least one expression and orientation (n = 3).