Macaque facial expressions

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Here, we measured the effect of social facial expressions, mimicking responses to social events, on gaze following in longtailed macaques, Macaca fascicularis, using a human demonstrator.

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Self-concealing of facial expressions by an adult wild Barbary macaque male was observed and filmed 22 times. This study, thus, reports the first case of face concealment behaviour in a wild monkey species. The behaviour lends itself both to complex cognitive and to simpler explanations.

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Taken together, these findings indicate that simply exposing people to Barbary macaque facial expressions and their corresponding emotional states using pictures on a board as is routinely done in a wildlife tourism or zoo setting, might not be a sufficient educational tool to reduce misinterpretation of an animal's emotional state.

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The ability to recognize and accurately interpret facial expressions is critically important for nonhuman primates that rely on these nonverbal signals for social communication. Despite this, little is known about how nonhuman primates, particularly monkeys, discriminate between facial expressions.

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A new study from the University of Lincoln found that when humans try to guess the facial expressions of Barbary macaques, they often get them wrong—really wrong. macaque monkeys, in the present study, we investigated whether OT would modulate fMRI responses evoked by the perception of facial expressions, an effect mainly studied in humans thus far. We scanned monkeys while they viewed images of monkey faces with four different expressions: neutral, fearful, aggressive, and appeasing.

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Facial expression, body postures, and gestures are all forms of non-vocal communication among rhesus macaques and are important in interactions between individuals at short distances (Partan ). One facial expression that is seen throughout macaque species and is one of the most common expressions in rhesus macaques is the "silent bared. 19 Caralyn Kemp, Gisela Kaplan, Facial expressions in common marmosets (Callithrix jacchus) and their use by conspecifics, Animal Cognition, , 16, 5, CrossRef; 20 Asif A. Ghazanfar, Multisensory vocal communication in primates and the evolution of rhythmic speech, Behavioral Ecology and Sociobiology, , 67, 9, CrossRef.

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concealing of facial expressions by a monkey, a Barbary macaque (Macaca sylvanus), living in the wild. On eight.. bary macaques is regarded as relaxed (Thierry ), with high sociality. SINGLE AND MULTICHANNEL SIGNAL COMPOSITION: FACIAL EXPRESSIONS AND VOCALIZATIONS OF RHESUS MACAQUES (MACACA MULATTA) by SARAH R. PARTAN1 2) (Animal Behavior Group, University of California, Davis).

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Description:A girl pretended having a piece of food in her hand and pointed it to a Barbary Macaque in Gibraltar. As a response he made this facial expression to her. However, in rhesus macaques, fear grins can also be evoked by real or toy snakes. Gaze direction is indeed an important component of facial expression in both humans and monkeys (6, 7). To control for gaze, our face stimuli were all gaze-directed toward the viewer. The crested macaque (Macacanigra) is an ideal species to begin testing the adaptive function of facial expression, as it is equipped with one of the largest and richest repertoires of facial expression in the genus Macaca (Dobson ).
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