Teeth Baring as a Model to Understand Complex Facial Signals in a Tolerant Macaque Species.

Autor: Fantoni F; Department of Biology, Unit of Ethology, University of Pisa, Pisa, Italy., Maglieri V; Department of Biology, Unit of Ethology, University of Pisa, Pisa, Italy., Giusti N; Department of Biology, Unit of Ethology, University of Pisa, Pisa, Italy., Scopa C; Department of Neurosciences, University of Parma, Parma, Italy., Pallante V; The Netherlands Institute for the Study of Crime and Law Enforcement, Amsterdam, The Netherlands., Loprete AL; Department of Biology, Unit of Ethology, University of Pisa, Pisa, Italy., Palagi E; Department of Biology, Unit of Ethology, University of Pisa, Pisa, Italy.
Jazyk: angličtina
Zdroj: American journal of primatology [Am J Primatol] 2025 Jan; Vol. 87 (1), pp. e23697. Date of Electronic Publication: 2024 Nov 17.
DOI: 10.1002/ajp.23697
Abstrakt: Facial communication regulates many aspects of social life in human and nonhuman primates. Empirically identifying distinct facial expressions and their underlying functions can help illuminate the evolution of species' communicative complexity. We focused on bared-teeth faces (BTFs), a highly versatile facial expression in the tolerant macaque Macaca tonkeana. By employing a diverse array of techniques (MaqFACS, unsupervised cluster analysis, Levenshtein distance, NetFACS), we quantitatively discriminated two distinct BTFs: bared-teeth (BT) and open mouth bared-teeth (OMBT), and evaluated their distribution across peaceful, playful, and agonistic contexts. Neither BT nor OMBT were context-specific, although BT frequently occurred during peaceful interactions and with low levels of stereotypy. OMBT was highly stereotyped during play, a context involving strong unpredictability. The presence of tongue-protrusion during OMBT was exclusive to peaceful contexts whereas the presence of glabella-lowering during BT and OMBT was specific to agonistic contexts. Hence, BT and OMBT per se are not context-specific, but their contextual relevance hinges on the inclusion of specific key elements. Moving forward, concurrent analyses of stereotypy and specificity should extend beyond our study to encompass other primate and non-primate species, facilitating direct comparisons and revealing how communicative and social complexity coevolve.
(© 2024 The Author(s). American Journal of Primatology published by Wiley Periodicals LLC.)
Databáze: MEDLINE
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