Cognitive-neuropsychological function in chronic physical aggression and hyperactivity

Histories of violence and of hyperactivity are both characterized by poor cognitive-neuropsychological function. However, researchers do not know whether these histories combine in additive or interactive ways. The authors tested 303 male young adults from a community sample whose trajectories of teacher-rated physical aggression and motoric hyperactivity from kindergarten to age 15 were well defined. No significant interaction was found. In a 1st model, both histories of problem behavior were independently associated with cognitive-neuropsychological function in most domains. In a second model controlling for IQ, General Memory, and test motivation, none of the three Working Memory tests (relevant to executive function) remained associated with physical aggression or hyperactivity. These results support an additive model but no specificity to executive function [corrected].