Effects of Position and Task Demands on Endogenous Eyeblink

Sugiyama, Toshiko; Watanabe, Ichiro; Tada, Hideoki

doi:10.2466/22.27.pms.116.2.406-414

Cited by 1 publication

(1 citation statement)

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“…In humans , blink rate ranges from 15 blinks/min [ 70 ] to 20.8 blinks/min [ 71 ] depending on the task, typically ranging between 200 and 500ms (average duration: 403.6 ms) [ 63 ]. In free moving marmosets , mean eye blinking is about 5.4 blinks/min and lasts on average 178.2ms [ 63 ].…”

Section: Resultsmentioning

confidence: 99%

CalliFACS: The common marmoset Facial Action Coding System

et al. 2022

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Facial expressions are subtle cues, central for communication and conveying emotions in mammals. Traditionally, facial expressions have been classified as a whole (e.g. happy, angry, bared-teeth), due to automatic face processing in the human brain, i.e., humans categorise emotions globally, but are not aware of subtle or isolated cues such as an eyebrow raise. Moreover, the same facial configuration (e.g. lip corners pulled backwards exposing teeth) can convey widely different information depending on the species (e.g. humans: happiness; chimpanzees: fear). The Facial Action Coding System (FACS) is considered the gold standard for investigating human facial behaviour and avoids subjective interpretations of meaning by objectively measuring independent movements linked to facial muscles, called Action Units (AUs). Following a similar methodology, we developed the CalliFACS for the common marmoset. First, we determined the facial muscular plan of the common marmoset by examining dissections from the literature. Second, we recorded common marmosets in a variety of contexts (e.g. grooming, feeding, play, human interaction, veterinary procedures), and selected clips from online databases (e.g. YouTube) to identify their facial movements. Individual facial movements were classified according to appearance changes produced by the corresponding underlying musculature. A diverse repertoire of 33 facial movements was identified in the common marmoset (15 Action Units, 15 Action Descriptors and 3 Ear Action Descriptors). Although we observed a reduced range of facial movement when compared to the HumanFACS, the common marmoset’s range of facial movements was larger than predicted according to their socio-ecology and facial morphology, which indicates their importance for social interactions. CalliFACS is a scientific tool to measure facial movements, and thus, allows us to better understand the common marmoset’s expressions and communication. As common marmosets have become increasingly popular laboratory animal models, from neuroscience to cognition, CalliFACS can be used as an important tool to evaluate their welfare, particularly in captivity.

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