Measurement invariance is a prerequisite for confident cross-cultural comparisons of personality profiles. Multigroup confirmatory factor analysis was used to detect differential item functioning (DIF) in factor loadings and intercepts for the Revised NEO Personality Inventory (P. T. Costa, Jr., & R. R. McCrae, 1992) in comparisons of college students in the United States (N = 261), Philippines (N = 268), and Mexico (N = 775). About 40%-50% of the items exhibited some form of DIF and item-level noninvariance often carried forward to the facet level at which scores are compared. After excluding DIF items, some facet scales were too short or unreliable for cross-cultural comparisons, and for some other facets, cultural mean differences were reduced or eliminated. The results indicate that considerable caution is warranted in cross-cultural comparisons of personality profiles.

Mixed viral infections of heterologous viruses such as Potato virus Y (family Potyviridae, genus Potyvirus, PVY) and Potato leafroll virus (family Luteoviridae, genus Polerovirus, PLRV) are a regular occurrence in Idaho's potato, Solanum tuberosum (L.), cropping systems. An increased number of plant samples from Idaho's potato fields over the past 2 yr has serologically tested positive for both PVY and PLRV via double antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA) and exhibited more severe symptoms than singly-infected plants (PVY or PLRV). Several studies have extensively examined the mixed infection phenomenon but to the best of our knowledge, none have examined the effect of such infections on vector biology and preference. Laboratory studies were conducted to examine the effect of mixed viral (PVY-PLRV) infection on the fecundity and preference of two of the most efficient PVY and PLRV vectors, the green peach aphid, Myzus persicae (Sulzer), and the potato aphid, Macrosiphum euphorbiae (Thomas) (Hemiptera: Aphididae). M. persicae and M. euphorbiae adults were clip-caged (one adult per cage) to leaflets of PVY, PLRV, PVY-PLRV-infected, and noninfected potato plants. The number of nymphs produced in all four treatments was recorded after 96 h. M. persicae and M. euphorbiae fecundity was significantly higher on mixed infected plants than on singly infected plants or noninfected plants. Preference of alatae and apterae of M. persicae and M. euphorbiae was determined with the use of settling bioassays. Both alatae and apterae of M. persicae and M. euphorbiae preferentially settled on PVY-PLRV-infected plants than on singly infected plants (PVY or PLRV) or noninfected plants.

According to Self-Determination Theory (SDT), satisfaction of needs for autonomy, competence, and relatedness is a universal requirement for psychological well-being. We tested this hypothesis with college students in the United States, Australia, Mexico, Venezuela, the Philippines, Malaysia, China, and Japan. Participants rated the extent to which these needs, plus needs for self-actualization and pleasure-stimulation, were satisfied in various roles and reported their general hedonic (i.e., positive and negative affect) and eudaimonic (e.g., meaning in life, personal growth) well-being. Asian participants averaged lower than non-Asian participants in perceived satisfaction of autonomy, competence, and self-actualization needs and in most aspects of eudaimonic well-being, and these differences were partially accounted for by differences in dialecticism and independent self-construals. Nonetheless, perceived need satisfaction predicted overall well-being to a similar degree in all cultures and in most cultures provided incremental prediction beyond the Big Five traits. Perceived imbalance in the satisfaction of different needs also modestly predicted well-being, particularly negative affect. The study extended support for the universal importance of SDT need satisfaction to several new cultures.

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Western theories suggest that self-concept consistency is important for well-being, but cultural psychologists have proposed that this relationship may be weaker in collectivistic or dialectical cultures. Hypotheses regarding the ability of self-concept (cross-role) consistency and short-term stability to predict hedonic and eudaimonic well-being across cultures were tested. College students in the United States, Australia, Mexico, Venezuela, Philippines, Malaysia, China, and Japan rated their traits in various roles at test and retest and completed measures of hedonic and eudaimonic well-being. In all cultures, cross-role consistency and short-term stability were inversely associated with negative affect, an aspect of hedonic well-being, and positively associated with Big Five Emotional Stability. In contrast, cross-role consistency and short-term stability were related to eudaimonic well-being more reliably in individualistic cultures than in collectivistic cultures, although the results in China only partially conformed to this pattern. We concluded that cross-role variability and short-term instability of self-concepts have a significant temperamental or affective basis and this temperamental basis is a cultural universal. In addition, cultural psychology predictions of a weaker relationship between self-concept consistency and well-being in collectivistic cultures, as compared to individualistic cultures, was largely supported for eudaimonic well-being.Keywords: culture, cross-role consistency, short-term stability, hedonic and eudaimonic wellbeing, individualism-collectivism, dialecticism SELF-CONCEPT CONSISTENCY AND WELL-BEING 3 Self-concept consistency has been defined in a variety of ways and different consistency constructs may relate differently to well-being (Campbell, Assanand, & Di Paula, 2003). In the present study, we define self-concept consistency as the consistency of individuals' trait ratings across different roles, and refer to this construct as cross-role consistency (see also Boucher, 2011;Church, Anderson-Harumi et al., 2008) According to theory (e.g., Jahoda, 1958;Jourard, 1965) and empirical findings (Campbell et al., 2003;Church, Anderson-Harumi et al., 2008;Donahue, Robins, Roberts, & John, 1993; Sheldon et al., 1997), a consistent and stable self-concept is important for adjustment or wellbeing, at least in Western or individualistic cultures. However, cultural psychologists have hypothesized that the relationship between consistency and well-being may be weaker or nonexistent in collectivistic cultures, where self-concept flexibility and adaptability to situational contexts are valued (Markus & Kitayama, 1998;Suh, 2002). Indeed, Suh (2002), in a comparison of cross-role consistency in Americans and Koreans, found support for this hypothesis, and attributed the cultural differences to differences in self-construals.Alternatively, English and Chen (2007) and Boucher (2011) attributed the hypothesized weaker relationship between cross-role consistency and well-being in East...

Self-concept consistency and short-term stability were investigated in the United States, Australia, Mexico, Venezuela, Philippines, Malaysia, China, and Japan. Evidence for substantial cross-role consistency and reliable within-individual variability in trait self-perceptions were found in each culture. Participants in all cultures exhibited short-term stability in their selfreported traits within roles and moderately stable if-then patterns of trait self-perceptions.Cultural differences, which primarily involved Japan, were partially accounted for by cultural differences in dialecticism, but not self-construals or cultural tightness. In all cultures, satisfaction of needs in various roles partially accounted for within-individual variability in selfreported traits. The results provide support for integrating trait and cultural psychology perspectives, as well as structure and process approaches, in the study of self-concepts across cultures.Keywords: culture; self-concept; consistency; within-individual variability; self-construals; dialecticism; tightness-looseness SELF-CONCEPT CONSISTENCY IN EIGHT CULTURES 3 IntroductionWestern theorists have long contended that a consistent self-concept is important for adjustment and a clear sense of identity (Jahoda, 1958;Jourard, 1965;Maslow, 1954). For example, in Erikson's (1950) theory, healthy mastery of the identity versus role diffusion stage of development involves self-perceptions of inner sameness and continuity. Similarly, Jourard (1965) argued that a psychologically healthy individual retains a consistent self-view across social roles. Consistent with these theories, studies in American samples have linked self-concept inconsistency to a variety of unhealthy outcomes, including anxiety, depression, lower selfesteem, and lower life satisfaction (Campbell, Assanand, & Di Paula, 2003;Donahue, Robins, Roberts, & John, 1993;Sheldon, Ryan, Rawsthorne, & Ilardi, 1997). Researchers who have investigated self-concept consistency across cultures have generally done so by quantifying the amount of variability in participants' ratings of their personality traits across various roles or relationships. In the present study, we extended this research by investigating the cross-role consistency and short-term stability of trait self-SELF-CONCEPT CONSISTENCY IN EIGHT CULTURES 4 perceptions in eight diverse cultures. In formulating hypotheses about cultural differences in consistency it is useful to consider both trait and cultural psychology perspectives. Trait and cultural psychology perspectives on consistencyFrom trait psychology, we anticipate that people in all cultures exhibit a degree of consistency in how they describe their traits in various roles (Church, 2000;Funder & Colvin, 1991;Oishi, Diener, Scollon, & Biswas-Diener, 2004). In this view, heritable traits contribute to a degree of behavioral consistency in all cultures, which, in turn, leads to some consistency in self-perceptions of one's traits in various roles (Funder, 1995;Wood & Roberts, 2006). Fr...

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