A third reason for a new model of ADHD is that the current view treats the subtypes of ADHD as sharing qualitatively identical deficits in attention while differing only in the presence of hyperactive-impulsive symptoms. As noted above, it is doubtful that the problems with inattention associated with hyperactive- impulsive behavior lie in the realm of attention, whereas those seen in the predominantly inattentive type of ADHD appear to do so.