Department of Psychology, Nottingham Trent University , Nottingham NG1 4FQ, UK.
School of Psychology, University of Lincoln , Lincoln LN6 7TS, UK.
Proc Biol Sci. 2024 Aug;291(2027):20240984. doi: 10.1098/rspb.2024.0984. Epub 2024 Jul 17.
Social living affords primates (including humans) many benefits. Communication has been proposed to be the key mechanism used to bond social connections, which could explain why primates have evolved such expressive faces. We assessed whether the facial expressivity of the dominant male (quantified from the coding of anatomically based facial movement) was related to social network properties (based on social proximity and grooming) in nine groups of captive rhesus macaques () housed in uniform physical and social environments. More facially expressive dominant male macaques were more socially connected and had more cohesive social groups. These findings show that inter-individual differences in facial expressivity are related to differential social outcomes at both an individual and group level. More expressive individuals occupy more beneficial social positions, which could help explain the selection for complex facial communication in primates.
社交生活为灵长类动物（包括人类）带来了许多好处。有人提出，交流是建立社会联系的关键机制，这可以解释为什么灵长类动物进化出如此富有表现力的面部表情。我们评估了在 9 个圈养的恒河猴（）群体中，主导雄性（通过基于解剖的面部运动编码来量化）的面部表情表达能力是否与社会网络特性（基于社交接近度和梳理行为）有关，这些群体生活在统一的物理和社会环境中。更具面部表情表达能力的主导雄性猕猴在社交上更加紧密，群体也更加团结。这些发现表明，个体间面部表情表达能力的差异与个体和群体层面的不同社会结果有关。更具表达力的个体占据更有利的社会地位，这有助于解释灵长类动物复杂面部交流的选择。
