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Optimists hold positive expectancies for their future, which some have suggested leads to advantages in the social realm (Carver, Scheier, & Segerstrom, 2010). Unfortunately, the research supporting this notion is scant and suffers from the confound that self-reports from optimists reflect their optimistic perspective. To address this issue, the present study examined the impact of optimism on interpersonal outcomes assessed from the perspective of those in relationships with each target. We recruited 182 participants to complete a series of psychological measures and interpersonal activities over the course of ten weeks. Participants rated themselves and each other on the five-factor traits at three stages in the developing relationship: zero-acquaintance, after their first conversation with each other, and after nine weeks of acquaintance. Two additional informants nominated by each target as those who knew them well (i.e. friends or family members) provided more extensive personality descriptions using a California Q-Set. Optimists consistently rated themselves as more agreeable and less neurotic than those low in optimism, but only the difference in neuroticism was detectable by perceivers. Furthermore, this difference was discernable only after nine-weeks of acquaintanceship had been established. Target optimism had no impact on first impressions. Although there may exist an optimistic personality profile across the five major traits, we found little evidence to suggest that anything other than lower neuroticism contributes to the impact that optimism might have on one's social life and relationships.

Individuals’ recollections of events have been shown to be susceptible to external factors, especially when it comes to speed estimations. This study explored the impact of perceptually disfluent presentations and presentation modalities of car crashes on observers’ estimations of speed, in addition to the testing the currently accepted effect of leading questions on the same. Participants viewed videos or images of car crashes, presented in higher or lower visual quality, and reported how fast the vehicles were traveling when they “made contact” or “smashed into” each other. Results showed that neither question phrasing, visual quality, nor presentation modality of car crashes affected speed estimates. Individuals who believe cars to travel at higher speeds, however, in general estimated higher speeds when viewing car crash images, especially when presented in lower visual quality. These findings suggest that a combination of external factors may influence event recall depending on individual’s pre-existing beliefs about car speeds, and should be considered prior to obtaining eyewitness accounts.