ADHD, Attention-Deficit-Hyperactivity disorder is a frequently diagnosed childhood disorder. Variations in cognitive control may be a vital factor in ADHD. The present, ongoing study’s goal is to understand how reward modulation modulates the temporal dynamics of cognitive control in children (ages 8-16) with and without ADHD with an AX continuous performance task (AX-CPT). This task is a reward incentivized cognitive control task. In addition to AX-CPT, high-resolution pupillometry is used as another measure of cognitive effort. Upon preliminary analysis of results, there are potential differences in cognitive and motivational processes in children with ADHD compared to those without it.