Schmitt LM, et al. - This study aims to examine the cognitive mechanisms of inhibitory control deficits in autism spectrum disorder (ASD). The authors indicate that inhibitory control deficits in ASD involve failures to strategically delay behavioral response onset. These outcomes propose that in ASD, reduced preparatory behavioral control may underpin inhibitory control deficits as well as repetitive behaviors. During late childhood/early adolescence, typical age-related improvements in inhibitory control are reduced in ASD, underscoring an important developmental window during which treatments may mitigate cognitive alterations contributing to repetitive behaviors.