% pubman genre = article @article{item_3017045, title = {{Captive chimpanzees{\textquoteright} manual laterality in tool use context: Influence of communication and of sociodemographic factors}}, author = {Prieur, Jacques and Pika, Simone and Blois-Heulin, Catherine and Barbu, St{\'e}phanie}, issn = {0376-6357}, doi = {10.1016/j.beproc.2018.04.009}, publisher = {Elsevier}, year = {2018}, date = {2018-12}, abstract = {{Understanding variations of apes{\textquoteright} laterality between activities is a central issue when investigating the evolutionary origins of human hemispheric specialization of manual functions and language. We assessed laterality of 39 chimpanzees in a non-communication action similar to termite fishing that we compared with data on five frequent conspecific-directed gestures involving a tool previously exploited in the same subjects. We evaluated, first, population-level manual laterality for tool-use in non-communication actions; second, the influence of sociodemographic factors (age, sex, group, and hierarchy) on manual laterality in both non-communication actions and gestures. No significant right-hand bias at the population level was found for non-communication tool use, contrary to our previous findings for gestures involving a tool. A multifactorial analysis revealed that hierarchy and age particularly modulated manual laterality. Dominants and immatures were more right-handed when using a tool in gestures than in non-communication actions. On the contrary, subordinates, adolescents, young and mature adults as well as males were more right-handed when using a tool in non-communication actions than in gestures. Our findings support the hypothesis that some primate species may have a specific left-hemisphere processing gestures distinct from the cerebral system processing non-communication manual actions and to partly support the tool use hypothesis.}}, journal = {{Behavioural Processes}}, volume = {157}, pages = {610--624}, }