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This study examines day-to-day patterns of salivary cortisol and dehydroepiandrosterone (DHEA) under baseline conditions and in response to mild stress among 59 children residing in a rural Caribbean village. Cortisol secretion showed the typical circadian variation with high levels in the...
Previous research suggests that facial-width-to-height ratio (FWHR) predicts aggression, unethical behavior, and non-reciprocity of trust. One limitation of this research is that all samples originate from western countries. To overcome this limitation, the present study investigates the...
There has long been much interest in whether psychological stress may have inhibitory effects on ovarian hormone production and associated fecundity in women, but previous research has been inconclusive. The present study assessed whether hormone concentrations were lower on days with higher...
Early-stage romantic love constitutes a unique phase associated with distinct brain activations and neuro-hormonal processes that function to consolidate the affiliative bond. Little research addressed functioning of the hypothalamic-pituitary-adrenal (HPA) axis during this phase or tested the...
An individual’s fitness depends not only on their phenotype but also on the phenotypes of their competitors and contemporaries. Sexual attractiveness may be strongly influenced by an individual’s familiarity to potential mates or the rarity of the individual’s phenotype. Such effects can cause...
Social hierarchies and physiology are intricately linked, but these associations have not been well studied in adolescence, typically a time of increased focus on social status. Three studies were conducted to better understand the relationship between social dominance, personality and related...
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