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Abstract
ADHD is one of the most prevalent neurodevelopmental disorders in our society. One of the hallmark features of ADHD is increased reaction time variability (RTV), which is particularly significant among children, as RTV is implicated in many goal-‐directed behaviors and later academic achievement. Recent brain imaging studies have revealed that those with ADHD have atypical functional brain signatures compared with those without ADHD, suggesting a neurobiological basis for ADHD that can be measured using brain imaging.