In a previous work,4 we suggested that attention can be modeled as a periodic window. Some attention-deficit hyperactivity disorder (ADHD) symptoms are difficulty in maintaining attention on one subject and frequent switching from one activity to another.5 It seems that these behaviors are similar to intermittent chaos. A chaotic system at the intermittency situation shows erratic behavior2 that is similar to the disorganized mind’s behavior in people with attention deficit. ADHD patients have also difficulty in keeping their attention on a task and, similarly, at intermittency, the chaotic system cannot preserve its periodic manner, and switches to chaos. Therefore, the idea comes to mind that intermittency regions of chaotic systems can be used to model ADHD. Closer analysis of this idea, especially, chaotic analysis of the electroencephalogram (EEG) signals of patients in normal and long attention mode seems to be valuable. This model may be useful for better understanding of ADHD. We suggest that using control methods of intermittency6 may be valuable in finding some solutions to improve attention-deficit disorder.