Young men are more distressed by a partner's sexual infidelity, whereas young women are more distressed by a partner's emotional infidelity. The present research investigated (a) whether the sex difference in jealousy replicates in an older sample, and (b) whether younger people differ from older people in their selection of the more distressing infidelity scenario. We presented forced-choice d...

The relative importance of genetic and environmental factors for stress coping styles, age and gender differences, and the relationship between coping styles and personality traits were assessed in middle-aged and older adult twins reared apart and reared together, as part of the ongoing Swedish Adoption/Twin Study of Aging (SATSA). The Billings and Moos Coping Measure was administered to 1339 ...

Using longitudinal data and structural modeling, we investigated bidirectional associations among preadolescents' peer relationships, peer-relevant cognition, and depressive symptoms. Depression was expected to be an outcome and precursor of peer-relevant cognition, and cognition was expected to be an outcome and precursor of being more or less liked by classmates (peer likeability). We also ex...

BACKGROUND Nearly one-half of Guatemalan children experience growth faltering, more so in indigenous than in nonindigenous children. OBJECTIVES On the basis of ethnographic interviews in Totonicapán, Guatemala, which revealed differences in maternal perceptions about food needs in infant girls and boys, we predicted a cumulative sex difference in favor of girls that occurred at ∼6 mo of age a...

It has been proposed that environmental chemicalization is responsible for the recent decline in male ratio, but these speculations are based on statistics going back only a few decades. The objective of this study was to evaluate whether Finnish long-term data are compatible with the hypothesis that the decrease in the ratio of male to female births in industrial countries is caused by environ...