To investigate effects of pain cues on behavior, responses of high and low aggressive boys were followed either by pain cues or by nonpain cues. Overall, pain cues facilitated the rate of responding more than nonpain cues. More responses were made by high aggressive boys than by low aggressive boys. (Author)

Findings suggest that extroverts are more likely to be susceptible to behavioral contagion, i.e., spontaneous imitation of another's behavior, than introverts. (Author)

In the first of two studies, male undergraduates were either angered or not angered by a confederate. In the second study, subjects in the angry condition displayed more aggression, and thwarting increased subsequent aggressivity. (Author)