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Research on the leadership of executives in the United States typically follows one of two traditions, emphasizing either characteristics of the incumbent or features of the office. This article brings together these traditions. It draws upon the work of Winter to develop measures of three aspects of personality—the power, achievement, and affiliation drives—and hypothesizes that the power and achievement motives are exhibited in conjunction by successful chief executives. It then tests this hypothesis within the contexts of the American states, thus accounting for both the leaders as individuals and the features of the political and economic environments in which they lead. The primary hypothesis is affirmed. Governors who exhibit high levels of the power and achievement motives in tandem are substantially more likely to achieve their policy goals. In addition, governors who emphasize affiliation are less successful.  相似文献   
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Previous research has shown that primes that induce particular spatial perspectives can influence temporal judgements. However, most studies have used priming stimuli that involve both spatial and motor language and imagery. Here we ask whether the motor content of these stimuli plays an important role in their ability to serve as effective primes. A total of 198 adult participants made temporal judgements after exposure to spatial primes involving varying levels of imagined effort. Spatial primes involving imagined motor actions, but not those involving equivalent passive motions through space, successfully primed decisions about time. This suggests that motor content, rather than spatial content alone, contributes to the priming effects that arise when people make temporal judgements after exposure to particular spatial perspectives.  相似文献   
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Barth HC 《Cognition》2008,109(2):251-266
Evidence from human cognitive neuroscience, animal neurophysiology, and behavioral research demonstrates that human adults, infants, and children share a common nonverbal quantity processing system with nonhuman animals. This system appears to represent both discrete and continuous quantity, but the proper characterization of the relationship between judgments of discrete and continuous quantity remains controversial. Some researchers have suggested that both continuous and discrete quantity may be automatically extracted from a scene and represented internally, and that competition between these representations leads to Stroop interference. Here, four experiments provide evidence for a different explanation of adults’ performance on the types of tasks that have been said to demonstrate Stroop interference between representations of discrete and continuous quantity. Our well-established tendency to underestimate individual two-dimensional areas can provide an alternative explanation (introduced here as the “illusory-Stroop” hypothesis). Though these experiments were constructed like Stroop tasks, and they produce patterns of performance that initially appear consistent with Stroop interference, Stroop interference effects are not involved. Implications for models of the construction of cumulative area representations and for theories of discrete and continuous quantity processing in large sets are discussed.  相似文献   
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Do children draw upon abstract representations of number when they perform approximate arithmetic operations? In this study, kindergarten children viewed animations suggesting addition of a sequence of sounds to an array of dots, and they compared the sum to a second dot array that differed from the sum by 1 of 3 ratios. Children performed this task successfully with all the signatures of adults' nonsymbolic number representations: accuracy modulated by the ratio of the sum and the comparison quantity, equal performance for within- and cross-modality tasks and for addition and comparison tasks, and performance superior to that of a matched subtraction task. The findings provide clear evidence for nonsymbolic numerical operations on abstract numerical quantities in children who have not yet been taught formal arithmetic.  相似文献   
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Previous studies have suggested that children's learning of the relation between number words and approximate numerosities depends on their verbal counting ability, and that children exhibit no knowledge of mappings between number words and approximate numerical magnitudes for number words outside their productive verbal counting range. In the present study we used a numerical estimation task to explore children's knowledge of these mappings. We classified children as Level 1 counters (those unable to produce a verbal count list up to 35), Level 2 counters (those who were able to count to 35 but not 60) and Level 3 counters (those who counted to 60 or above) and asked children to estimate the number of items on a card. Although the accuracy of children's estimates depended on counting ability, children at all counting skill levels produced estimates that increased linearly in proportion to the target number, for numerosities both within and beyond their counting range. This result was obtained at the group level (Experiment 1) and at the level of individual children (Experiment 2). These findings provide evidence that even the least skilled counters do exhibit some knowledge of the form of the mapping between large number words and approximate numerosities.  相似文献   
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An investigation of sex differences in same-sex friendships was conducted in terms of the intersection and social penetration model of relationship development, and Bem's theory of sex role orientation. The results indicated that there were significant sex differences in the nature of the same-sex friendships studied. In the terminology of Levinger's (Toward the Analysis of Close Relationships, Journal of Experimental Psychology, 1980, 16, 510–544) intersection model, female same-sex friendships indicated greater involvement. In the terminology of Altman and Taylor's (Social Penetration: The Development of Interpersonal Relationships, New York: Holt, Rinehart & Winston, 1973) social penetration model, female friendships demonstrated greater depth. Overall, the female friendships were of longer duration than those of the males. The differences in involvement and depth were found within each designated level of friendship (causal, good, and close). However, the difference in involvement was moderated by the sex role orientation of the participants, in that the sex difference was greater between sex-typed individuals than between androgynous individuals. An examination of questionnaire subscale intercorrelations indicated that females tended to seek friends to whom they could relate in many different areas, while males tended to develop different relationships to meet different needs.  相似文献   
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