speed discrimination results in ASD compared to TD group using drifting grating stimuli

This data represent the threshold of speed discrimination performance in participants with ASD compared to control group. this threshold was varied upon the change of spatial and temporal parameter of a drifting grating stimuli. when drifting grating stimuli moved at fast speed for short duration, ASD group showed an elevation in speed-discrimination threshold similar to the TD group. However, for long presentation, the ASD performance was enhanced in response to slow speed compared to TD group, for which task information was maintained for an extended period of time. Yet, these threshold differences were not statistically significant with any of the study parameters. We also compared the time taken for each participant to response to the stimulus. the results showed that both groups responded similarly to the increase/decrease of stimuli duration more than the speed parameter. However, an overall average RT shows no statistical differences in the group performance for any of the stimulus parameter in spite of the fact that enhanced RT was observed in the autism group when slow speed stimuli were presented at long duration.