In the study, researchers assembled a control group of 100 teenage boys and a group of 75 boys with a history of aggressive behavior; all the boys were shown to have similar cortisol levels before the experiment started. The study pitted each volunteer against a pugnacious, virtually generated rival boy in a computer game that had them competing for a monetary reward. The game was deliberately rigged to subject volunteers to stress, frustration, provocation, and taunting from their adversary [New Scientist]. Researchers took saliva samples from all the volunteers and found that control subjects’ cortisol levels went up during the game, while the volunteers with behavior problems had a drop in cortisol levels.
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