Extraverted and conscientious behavior predict mental depletion after a 3-hour delay. The results help reconcile previous findings regarding the consequences of state Extraversion and provide novel information about the consequences of state Conscientiousness.

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Spousal similarity and its consequences are widely studied, but methodologically challenging topics. We employed Response Surface Analysis to examine similarity along political attitudes, personal values, and personality traits. Opposite-sex couples (624 individuals) expecting a child were recruited. Spouses were highly similar regarding their political attitudes and moderately similar regarding trait Openness and the personal values Universalism and Tradition. Similarity for other traits and values was weak (e.g. Conscientiousness, Power values) or non-existent (e.g. Neuroticism, Benevolence values). Similarity in conservative vs. liberal attitudes was non-linear: a conservative-conservative union was most common. Women's relationship satisfaction was related to similarity in left-right and liberal-conservative political attitudes, and both partners' satisfaction was related to similarity in Self-Direction values. Similarity in personality traits was unrelated to relationship satisfaction.

In a sample of 7-to 8-year-old children (N = 760), we examined the associations between personality traits, oral fluency and sociometric popularity. Extending upon research conducted with older populations, we found parent ratings of extraversion at age 7 to predict popularity one year later. More importantly, we expected and found teacher-rated oral fluency to partially mediate the positive association between extraversion and popularity. This mediation effect was independent of psychometrically assessed working memory, academic skills and gender. Our results can be interpreted as suggesting that a Matthew effect, similar to the one proposed for early reading skills and cognitive ability, may be operating in the domain of social competence.

Spousal similarity and its consequences are widely studied, but methodologically challenging topics. We employed Response Surface Analysis to examine similarity along political attitudes, personal values, and personality traits. Opposite-sex couples (624 individuals) expecting a child were recruited. Spouses were highly similar regarding their political attitudes and moderately similar regarding trait Openness and the personal values Universalism and Tradition. Similarity for other traits and values was weak (e.g. Conscientiousness, Power values) or non-existent (e.g. Neuroticism, Benevolence values). Similarity in conservative vs. liberal attitudes was non-linear: a conservative-conservative union was most common. Women’s relationship satisfaction was related to similarity in left-right and liberal-conservative political attitudes, and both partners’ satisfaction was related to similarity in Self-Direction values. Similarity in personality traits was unrelated to relationship satisfaction.