Describes chemical model for patterns of aggressive behavior. Addresses cultural, neurobiological, and cognitive factors that affect violent children. Identifies five patterns of aggression (overaroused, impulsive, affective, predatory, and instrumental) and examines these dimensions of aggression for each pattern: baseline, precipitators, cognition, aggression, response, psychiatric diagnosis, neurobiology, pharmacological interventions, and psychological interventions. (NB)