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This study compared the accuracy and confidence of Japanese and American participants on the Interpersonal Perception Task (IPT-15). The IPT contains 15 brief, real-life scenes on videotape for which there are objectively correct answers about relationships and deception. A total of 344 participants were run in a 2 (Japanese vs. American participants) × 2 (Audiovisual vs. Visual-Only presentation) × 2 (Sex of participant) design. Support was found for the hypothesized greater accuracy of Americans over Japanese, but a Culture × Presentation Modality interaction qualified the main effect of culture. Specifically, Japanese and American participants had virtually identical scores on the IPT-15 in the Visual-Only condition, but Americans' scores increased while Japanese scores decreased in the Audiovisual condition. Analyses of the confidence measures indicated that American participants were much more confident than the Japanese participants, but this difference was larger in the Audiovisual condition than in the Visual-Only condition. In addition, the prediction that women would be more accurate on the IPT, but still report lower confidence than men, was also supported. Finally, Japanese participants with moderate proficiency in spoken English were more accurate on the IPT than those with low English proficiency. The likely processes underlying these differences and the possible directions for future research are discussed. [ABSTRACT FROM AUTHOR]

The present study examined the effects of cognitive demand and judgment strategy in performance on the Interpersonal Perception Task (Costanzo & Archer, 1989). The Interpersonal Perception Task (IPT) contains 30 brief, real-life scenes on videotape for which there are objectively correct answers to questions about status, intimacy, kinship, competition, and deception. A total of 142 participants were run in a 2 (high vs. low cognitive demand) × 2 (first impression vs. nonverbal cues strategy) × 2 (audiovisual vs. visual only modality) design. A significant Cognitive Demand × Judgment Strategy interaction supported the hypothesized benefit of a first impression strategy when participants experienced high, rather than low, cognitive demand. In contrast, participants receiving the nonverbal cues strategy had higher accuracy under low, rather than high, cognitive demand. The conditional effects of cognitive demand on person perception are considered and the larger role of cognitive resources in interaction is discussed. [ABSTRACT FROM AUTHOR]