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Motion perception deficits in autism spectrum disorders (ASD) are well documented. For example, ASD observers show higher motion coherence thresholds and impaired processing of biological motion stimuli. ASD is also associated with impairments in contextual processing of sensory information. These two lines of research motivated us to investigate the effects of stimulus size on motion perception in ASD. Typical observers show a surprising decrease in motion visibility of large, high-contrast stimuli—a contextual modulation termed spatial suppression. We measured motion discriminations for stimuli of different sizes (1, 2.5 and 6) in children with ASD (N= 11) and typical development (N= 14), matched for age and IQ. Stimuli (4Hz; 1cyc/; 93% contrast) were presented foveally. Adaptive staircases were used to estimate duration thresholds. As expected, we found that …