Six adult male rhesus monkeys did not learn from the choices of a conspecific shown in videos

Animal Cognition - There is substantial evidence of group-specific behaviors in wild animals that are thought to be socially transmitted. Yet experimental studies with monkeys have reported...     

The influence of vestibular system and fetal presentation on handedness,cognitive and motor development: A comparison between cephalic and breech presentation

Genetics are undoubtedly implicated in the ontogenesis of laterality. Nonetheless, environmental factors, such as the intrauterine environment, may also play a role in the development of functional and behavioral lateralization. The aim of this study was to test the Left-Otolithic Dominance Theory (LODT; Previc, 1991) by investigating a hypothetical developmental pattern where it is assumed that a breech presentation, which is putatively associated with a dysfunctional and weakly lateralized vestibular system, can lead to weak handedness and atypical development associated with language and motor difficulties. We used the ALSPAC cohort of children from 7 to 10 years of age to conduct our investigation. Our results failed to show an association between the vestibular system and fetal presentation, nor any influence of the latter on hand preference, hand performance, or language and motor development. Bayesian statistical analyses supported these findings. Contrary to our LODT-derived hypotheses, this study offers evidence that fetal presentation does not influence the vestibular system's lateralization and seems to be a poor indicator for handedness. Nonetheless, we found that another non-genetic factor, prematurity, could lead to atypical development of handedness.     

Lebanese adolescents’ expectations about social inclusion of peers in intergroup contexts

This study examined the role of group norms, group identity, age, contact, and stereotypes on youths’ decisions to include a peer in an intergroup context portraying Lebanese and American adolescents. Lebanese participants (N = 275), ages 12 and 16 years, were surveyed about expectations for inclusion of an out-group target with similar interests or an in-group target with different interests into their own Lebanese group or another American group. Findings indicated participants focused on shared interests, rather than national identity, when making inclusion decisions for either group and group norms mattered. Older participants expected American peers to be less inclusive towards an out-group peer. Direct contact predicted inclusivity of out-group American peers into one’s own Lebanese group, and indirect media-based contact predicted expectations for inclusivity into an American out-group. Findings have implications for interventions aimed at improving cross-national friendships which, in turn, have the potential to reduce prejudicial attitudes.