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The structural and motivational role of the unique lip‐flip movement in the gelada (Theropithecus gelada) facial display repertoire
dc.contributor.authorLazow, Stefanie P.
dc.contributor.authorBergman, Thore J.
dc.date.accessioned2020-06-03T15:23:31Z
dc.date.availableWITHHELD_13_MONTHS
dc.date.available2020-06-03T15:23:31Z
dc.date.issued2020-06
dc.identifier.citationLazow, Stefanie P.; Bergman, Thore J. (2020). "The structural and motivational role of the unique lip‐flip movement in the gelada (Theropithecus gelada) facial display repertoire." American Journal of Physical Anthropology 172(2): 280-290.
dc.identifier.issn0002-9483
dc.identifier.issn1096-8644
dc.identifier.urihttps://hdl.handle.net/2027.42/155514
dc.description.abstractObjectivesHuman language represents an extreme form of communicative complexity. Primate facial display complexity, which depends upon facial mobility, can be used as a model for the study of the evolution of communicative complexity. The gelada (Theropithecus gelada) is the only primate that can produce a lip‐flip eversion. This study investigates the role of the lip‐flip relative to the bared‐teeth display to understand its role in generating communicative complexity.Materials and methodsWe reviewed videos of gelada social interactions. We utilized the facial action coding system (FACS) to define structural component action units (AUs) of each display. We inferred display motivation from the behaviors of the display sender.ResultsThe lip‐flip was used only in combination with the essential AUs of the bared‐teeth display, serving as an optional structural element added to produce a structural variant. Both the bared‐teeth display with and without a lip‐flip occurred most frequently with nonaggressive, submissive behaviors. The lip‐flip was more frequently preceded by approach than the bared‐teeth display, especially in males. The lip‐flip was also present in the majority of structurally blended facial displays though the motivation of the non‐lip‐flip parent display often dominated.DiscussionThe lip‐flip may potentially function as an indicator of benign intent after an approach or as an intensifying component of nonaggressive intent. Adaptations to increase facial mobility in geladas via facilitating the lip‐flip may promote increased communicative complexity through increased conspicuousness and motivational signaling specification or intensification.
dc.publisherJohn Wiley & Sons, Inc.
dc.subject.otherfacial expression
dc.subject.otherfacial mobility
dc.subject.othergelada
dc.subject.otherbared‐teeth display
dc.subject.otherfacial display
dc.titleThe structural and motivational role of the unique lip‐flip movement in the gelada (Theropithecus gelada) facial display repertoire
dc.typeArticle
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelAnthropology
dc.subject.hlbtoplevelSocial Sciences
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/155514/1/ajpa24031_am.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/155514/2/ajpa24031.pdf
dc.identifier.doi10.1002/ajpa.24031
dc.identifier.sourceAmerican Journal of Physical Anthropology
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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