2010
DOI: 10.1007/s10071-010-0316-y
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Facial perception of conspecifics: chimpanzees (Pan troglodytes) preferentially attend to proper orientation and open eyes

Abstract: This paper reports on the use of an eye-tracking technique to examine how chimpanzees look at facial photographs of conspecifics. Six chimpanzees viewed a sequence of pictures presented on a monitor while their eye movements were measured by an eye tracker. The pictures presented conspecific faces with open or closed eyes in an upright or inverted orientation in a frame. The results demonstrated that chimpanzees looked at the eyes, nose, and mouth more frequently than would be expected on the basis of random s… Show more

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Cited by 44 publications
(47 citation statements)
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“…However, if this was the case no difference in discriminability would have been found whatever internal face region was masked. Therefore the eye region seems to have a special role in human face processing of dogs, corroborating the findings of Somppi et al [9] and supporting the hypothesis for a role of the eyes region in a global mechanism of face processing [34], [55], [56].…”
Section: Discussionsupporting
confidence: 86%
“…However, if this was the case no difference in discriminability would have been found whatever internal face region was masked. Therefore the eye region seems to have a special role in human face processing of dogs, corroborating the findings of Somppi et al [9] and supporting the hypothesis for a role of the eyes region in a global mechanism of face processing [34], [55], [56].…”
Section: Discussionsupporting
confidence: 86%
“…In case of chimpanzees, calibration error was estimated before testing, and the average error across participants was 0.40° (s.d. = 0.38°) of the visual angle of the chimpanzees 29 . We did not measure the calibration errors precisely in case of human infants and adults, because of accumulated knowledge about the validity of data collection using exactly the same device 11,12,25 , but the errors can be estimated as within the range of 1° of visual angle at most for our participants, judging from their fixation data with the stimulus used for attention getting.…”
Section: Discussionmentioning
confidence: 92%
“…The two males (both 15 years old) and four females (14, 14, 11 and 5 years old) lived as a group. All of them previously participated in several kinds of behavioural cognitive tasks, including tool use, sequential learning using touch screens and eye-tracking 29 . The chimpanzees spent a few hours each day interacting with humans indoors for study or husbandry purposes.…”
Section: Methodsmentioning
confidence: 99%
“…Again, the eyes of familiar individuals received more attention than the eyes of unfamiliar conspecifics. Preferential gaze towards the eye region of conspecific faces has also been found in chimpanzees (Hirata et al 2010).…”
Section: Introductionmentioning
confidence: 80%