How do rhesus monkeys (Macaca mulatta) scan faces in a visual paired comparison task?

Katalin M Gothard, Cynthia A. Erickson, David G. Amaral

Research output: Contribution to journalArticle

112 Citations (Scopus)

Abstract

When novel and familiar faces are viewed simultaneously, humans and monkeys show a preference for looking at the novel face. The facial features attended to in familiar and novel faces, were determined by analyzing the visual exploration patterns, or scanpaths, of four monkeys performing a visual paired comparison task. In this task, the viewer was first familiarized with an image and then it was presented simultaneously with a novel and the familiar image. A looking preference for the novel image indicated that the viewer recognized the familiar image and hence differentiates between the familiar and the novel images. Scanpaths and relative looking preference were compared for four types of images: (1) familiar and novel objects, (2) familiar and novel monkey faces with neutral expressions, (3) familiar and novel inverted monkey faces, and (4) faces from the same monkey with different facial expressions. Looking time was significantly longer for the novel face, whether it was neutral, expressing an emotion, or inverted. Monkeys did not show a preference, or an aversion, for looking at aggressive or affiliative facial expressions. The analysis of scanpaths indicated that the eyes were the most explored facial feature in all faces. When faces expressed emotions such as a fear grimace, then monkeys scanned features of the face, which contributed to the uniqueness of the expression. Inverted facial images were scanned similarly to upright images. Precise measurement of eye movements during the visual paired comparison task, allowed a novel and more quantitative assessment of the perceptual processes involved the spontaneous visual exploration of faces and facial expressions. These studies indicate that non-human primates carry out the visual analysis of complex images such as faces in a characteristic and quantifiable manner.

Original languageEnglish (US)
Pages (from-to)25-36
Number of pages12
JournalAnimal Cognition
Volume7
Issue number1
DOIs
StatePublished - 2004

Fingerprint

Matched-Pair Analysis
Macaca mulatta
Haplorhini
monkeys
Facial Expression
emotions
Eye Movement Measurements
eyes
visual analysis
comparison
Expressed Emotion
Process Assessment (Health Care)
primate
fearfulness
Primates
Fear
Emotions

Keywords

  • Eye movements
  • Face recognition
  • Facial expression
  • Inversion effect
  • Non-human primates

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Behavioral Neuroscience

Cite this

How do rhesus monkeys (Macaca mulatta) scan faces in a visual paired comparison task? / Gothard, Katalin M; Erickson, Cynthia A.; Amaral, David G.

In: Animal Cognition, Vol. 7, No. 1, 2004, p. 25-36.

Research output: Contribution to journalArticle

Gothard, Katalin M ; Erickson, Cynthia A. ; Amaral, David G. / How do rhesus monkeys (Macaca mulatta) scan faces in a visual paired comparison task?. In: Animal Cognition. 2004 ; Vol. 7, No. 1. pp. 25-36.
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