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People readily use social categories in their daily interactions with others. Although many scholars have focused on social categorization, they have largely neglected the cognitive representation of stimuli as a basis of this process. The present work aims to determine what dimensions are commonly used to organize the social world. The main dimensions of the social mental map are extracted from sorting data pertaining to a wide variety of social stimuli. Dimensions reflecting conventionalism, age, gender, physical versus cognitive orientation, warmth, and deviance are revealed. Furthermore, we show important individual differences in the extent to which each of these dimensions are attended to. We also establish the stability and reliability of our findings in a follow-up and a replication study.

Although the categorization of novel social stimuli according to general qualities of gender, age, and race is known to be automatic and primordial, categorizing stimuli into more specific social subgroups (e.g., hippies or businesswomen) is much more informative and cognitively efficient. In this paper, we show that social stimuli are more likely to be grouped into subgroups with an intermediate degree of specificity than into broad, general categories or narrow, highly specific categories. Furthermore, we show that category membership at the intermediate subgroup level predicts social judgments more efficiently than category membership at a more general or more specific level. We discuss the consequences of our results for social cognition and cognitive categorization.

The present study investigates patterns of event-related brain potentials following the presentation of attitudinal stimuli among political moderates (N = 12) and anarchists (N = 11). We used a modified oddball paradigm to investigate the evaluative inconsistency effect elicited by stimuli embedded in a sequence of contextual stimuli with an opposite valence. Increased late positive potentials (LPPs) of extreme political attitudes were observed. Moreover, this LPP enhancement was larger among anarchists than among moderates, indicating that an extreme political attitude of a moderate differs from an extreme political attitude of an anarchist. The discussion elaborates on the meaning of attitude extremity for moderates and extremists.