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

The relative power of cooperative and trusting patterns of behavior versus those of exploitation and distrust in affecting the results of group decision-making processes was investigated. The outcome of a study using the Prisoner's Dilemma Game seems to suggest the disproportionate influence of competitive people in these settings. (Author)