Pedruzzi Luca, Francesconi Martina, Galotti Alice, Bogale Bezawork Afework, Palagi Elisabetta, Lemasson Alban
EthoS (Ethologie Animale et Humaine) - U.M.R, Université de Rennes, Université de Normandie, CNRS, Rennes, France.
Unit of Ethology, Department of Biology, University of Pisa, Pisa, Italy.
PLoS One. 2025 May 14;20(5):e0323295. doi: 10.1371/journal.pone.0323295. eCollection 2025.
Recognizing vocal behaviours intended to benefit others is a crucial yet understudied social skill. Primates with rich vocal repertoires and complex societies are excellent models to track the evolution of such capacity. Here, we exposed wild geladas (Theropithecus gelada) to vocal exchanges between unfamiliar female victim screams and male affiliative calls. The stimuli were arranged in sequences either simulating vocal affiliation towards victims (scream-affiliative call) or violating such order (affiliative call-scream), with varying emotional arousal conveyed by the affiliative call type. Measuring gazing activity towards the loudspeaker and the interruptions of feeding, we show that monkeys were sensitive to the sequential order in vocal exchanges as well as to the emotional arousal conveyed by affiliative calls. Our field study suggests a prosocial use of vocalizations in wild monkeys and reveals that foundational cognitive elements for processing vocal exchanges as meaningful third-party interactions may have existed in our common ancestors with monkeys.
识别旨在造福他人的发声行为是一项至关重要但却研究不足的社交技能。拥有丰富发声 repertoire 和复杂社会群体的灵长类动物是追踪这种能力进化的绝佳模型。在这里，我们让野生狮尾狒（Theropithecus gelada）接触不熟悉的雌性受害者尖叫声和雄性亲和叫声之间的发声交流。刺激序列被安排为要么模拟对受害者的发声亲和（尖叫 - 亲和叫声），要么违反这种顺序（亲和叫声 - 尖叫），亲和叫声类型传达不同的情绪唤醒。通过测量对扬声器的注视活动和进食中断情况，我们发现猴子对发声交流中的顺序以及亲和叫声传达的情绪唤醒很敏感。我们的实地研究表明野生猴子的发声具有亲社会用途，并揭示了将发声交流作为有意义的第三方互动进行处理的基础认知元素可能存在于我们与猴子的共同祖先中。
