In attention-deficit/hyperactivity disorder (ADHD), atypical dynamics of large-scale cortical networks at rest (default-mode interference, as recorded through electroencephalogram/functional magnetic resonance imaging) are associated with lower perceptual decision making abilities. Theoretically, cortical network dynamics (which are thought to arise through altered dopaminergic signaling) impair the neural mechanisms underlying perceptual decision making abilities, and this impairment gives rise to many of the executive function deficits observed in ADHD. Here, we test whether the relationship between cortical network dynamics and perceptual decision making abilities differs as function of sex.