Individuals scoring high (Type As), intermediate, or low (Type Bs) on the Jenkins Activity Survey were given an opportunity to aggress against a stranger who, previously, had either provoked or not provoked them. The opportunity to aggress (as well as all other aspects of the study) took place in the presence of (a) a high concentration, (b) a moderate concentration, or (c) a low (ambient) concentration of negative air ions. Results indicated that exposure to moderate or high levels of negative ions significantly enhanced aggression by Type A subjects, but not by other participants. In addition, we found that negative ions produced positive shifts in subjects' reported moods in the absence of provocation, but negative shifts in moods in the presence of provocation. These findings suggest that moderate or high concentrations of negative ions serve as a source of heightened activation, thus enhancing individuals' dominant reactions or tendencies in a given situation.

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This field study examined the relationships between six predictor variables and a self-report measure of spectators' likelihood of joining in a crowd disturbance. Subjects were males (N = 78) found in attendance at an ice hockey game. The variables related to the likelihood of escalating a disturbance included subjects who were more impulsive, had a history of fighting, were younger, saw provocations as more volatile, liked to watch player fights and attended with others. A multiple regression analysis yielded a solution that accounted for 52.9% of the variance. The results were discussed against the background of previous research examining the factors associated with spectators' propensity for involving themselves in crowd disorders.

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