Scientists have attempted to test the association between anabolic steroids and aggression by administering high steroid doses or placebo for days or weeks to human volunteers and then assessing behavioral symptoms. In one such study, researchers found that testosterone over a six week period was associated with increased aggression, as assessed by a questionnaire and computer-based model of aggressive behavior.
83 In addition, high steroid doses produced greater feelings of irritability and aggression than placebo,
84 although the effects appear to be highly variable across individuals,
19 and other studies have not shown that effect.
85