Experimental studies in biomedical research frequently pose analytical problems related to
small sample size. In such studies, there are conflicting findings regarding the choice of …

Statistical inference based on stepwise model selection is applied regularly in ecological,
evolutionary, and behavioral research. In addition to fundamental shortcomings with regard …

Objective: The aim of this study was to investigate the effects of ongoing methylphenidate
(MPH) on ADHD-related and autistic symptoms in Pervasive Developmental Disorders …

Field studies of endocrine function in a range of social mammals suggest that high
dominance rank is commonly associated with elevated glucocorticoid production. This is …

Studies of social learning in the wild are important to complement findings from experiments
in captivity. In this field study, immature Bornean orangutans rarely foraged independently …

In group-living species, individuals gain significant advantages from establishing an
extensive network of social relationships. This results in complex organizations that are …

Yawn contagion in humans has been proposed to be related to our capacity for empathy. It
is presently unclear whether this capacity is uniquely human or shared with other primates …

Capuchin monkeys (Cebus apella) share food even if separated by a mesh restraint. Pairs of
capuchins were moved into a test chamber in which one of them received apple pieces for …

Teaching is a form of high-fidelity social learning that promotes human cumulative culture.
Although recently documented in several nonhuman animals, teaching is rare among …

Theory predicts that individuals living in fission–fusion societies, in which group members
frequently change subgroups, should modify grouping patterns in response to varying social …