Although the literature provides some empirical evidence, the picture is not as simple and univocal as described. Throughout childhood and adulthood, girls and women continue to be more socially expressive and responsive than age-matched males. Abstract Sex differences in human social behaviors and abilities have long been a question of public and scientific interest. Between-sex differences appear during a limited window of development and even change direction with age. Introduction Human sex differences are a perennially hot topic that not only grips the public interest, but that has triggered a great deal of scientific focus from biological to social sciences. They are also more prone to behave prosocially .
Nevertheless, while boys catch up and girls move on towards more complex play, sex differences in social play patterns are reversed in favor of boys at the following ages, such as in associative play at 4—5 years and cooperative play at 5—6 years. Preschool boys also display more solitary play than preschool girls, especially when young. This developmental perspective contributes to resolve apparent discrepancies between single-snapshot studies. We investigated whether girls show consistently more socially oriented and skilful forms of peer play and interactions than same-age boys from 2 to 6 years old, when most children begin to experience peer social interactions, or whether the sex difference changes as children grow older. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. They were also observed more frequently interacting with adults than older children for whom this proximity became rare. Our findings contribute to resolve the puzzling null or contradictory conclusions drawn from limited age-range samples or collapsed age-groups and raise important methodological issues such as the representativeness of samples in studies. Copyright Barbu et al. Finally, a variety of clinical conditions with marked social deficits, such as autism, occurs more often in males than in females, and has been described as an extreme manifestation of some male-typical traits, suggesting a continuum between typical and atypical social development . Between-sex differences appear during a limited window of development and even change direction with age. Beyond a great heterogeneity in methodologies, whether studies found differences or not seems dependent on children's ages. Some studies found no sex differences whereas others reported differences that were either congruent or not with gender stereotypes. It is well documented that with increasing age, children are more likely to engage in social play, proceeding from less to more mature forms of social interactions  ,  ,  , . As play is at least to some extent a universal activity of childhood  and provides an excellent window into children's social development  ,  and psychosocial adjustment  , we investigated sex- and age-related trends in social play development throughout early childhood. From birth to the first year, infant females show stronger social orientation responses than infant males, with a stronger interest in human faces  —  , a greater amount of eye contact  —  , and more accurate imitative abilities . Introduction Human sex differences are a perennially hot topic that not only grips the public interest, but that has triggered a great deal of scientific focus from biological to social sciences. We found significant effects of age for all the social categories: Both the amount and the quality of children's play are associated with measures of social motivation and competence, in particular with peers  — . Received Jul 29; Accepted Dec Developmental studies are thus especially needed in order to go beyond the current debate. Yet the developmental dynamics of sex differences has been rarely investigated, with one notable exception, but that focused on within-sex variation rather than between-sex differences . There is some evidence in support of this view. We showed that sex differences are not stable over time evidencing a developmental gap between girls and boys. Results Developmental trends over the preschool years Children's social play showed important changes during the preschool period, becoming more peer-oriented and structured with age Fig. However, despite an extensive literature, the very existence of sex differences remains a matter of discussion while some studies found no sex differences whereas others reported differences that were either congruent or not with gender stereotypes.
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