The authors next explore the role of individual features in determining antisocial behavior, including such influences as hyperactivity, cognitive impairment, temperament (e.g., impulsivity, sensation seeking, aggressivity, etc.), distorted social information processing, and biological features. The authors give short shrift to genetics, except as it pertains to hyperactivity, and devote relatively little attention to biological substrates, despite the burgeoning interest in this area and the replicability of certain findings (e.g., low pulse rate).