defined: a predominantly inattentive presentation (ADHD-I) a predominantly hyperactive-impulsive presentation (ADHD-HI) a combined presentation (ADHD-C) The predominantly inattentive presentation (ADHD-I) in is restricted to the official inattention symptoms (see table above) and only to those. They capture problems with persistence, distractibility and disorganization. But it fails to include these other, qualitatively different attention symptoms: As a comparison of both tables shows, there is no overlap between the official ADHD inattention symptoms and the SCT symptoms. That means that both symptom clusters do not refer to the same attention problems. They may exist in parallel within the same person but do also occur alone. However, one problem is still that some individuals who actually have SCT are currently misdiagnosed with the inattentive presentation. Social behaviour In many ways, those who have an SCT profile have some of the opposite symptoms of those with predominantly hyperactive-impulsive or combined type ADHD: instead of being hyperactive, extroverted, obtrusive, excessively energetic and risk takers, those with SCT are drifting, absent-minded, listless, introspective and daydreamy. They feel like they are "in the fog" and seem "out of it". The comorbid psychiatric problems often associated with SCT are more often of the internalizing types, such as anxiety, unhappiness or depression. Most consistent across studies was a pattern of reticence and social withdrawal in interactions with peers. Their typically shy nature and slow response time has often been misinterpreted as aloofness or disinterest by others. In social group interactions, those with SCT may be ignored and neglected. People with classic ADHD are more likely to be rejected in these situations, because of their social intrusiveness or aggressive behavior. Compared to children with SCT, they are also much more likely to show antisocial behaviours like substance abuse, oppositional-defiant disorder or conduct disorder (frequent lying, stealing, fighting etc.). Fittingly, in terms of personality, ADHD seems to be associated with sensitivity to reward and fun seeking while SCT may be associated with punishment sensitivity. Attention deficits Individuals with SCT symptoms may show a qualitatively different kind of attention deficit that is more typical of a true information processing problem; such as poor focusing of attention on details or the capacity to distinguish important from unimportant information rapidly. In contrast, people with ADHD have more difficulties with persistence of attention and action toward goals coupled with impaired resistance to responding to distractions. Unlike SCT, those with classic ADHD have problems with inhibition