The University of Southampton
University of Southampton Institutional Repository

How do monkeys view faces?—a study of eye movements

How do monkeys view faces?—a study of eye movements
How do monkeys view faces?—a study of eye movements
Face perception plays a crucial role in primate social communication. We have investigated the pattern of eye movements produced by rhesus monkeys (Macaca mulatta) as they viewed images of faces. Eye positions were recorded accurately using implanted eye coils, while neutral upright, inverted and scrambled images of monkey and human faces were presented on a computer screen. The monkeys exhibited a similar eye scan pattern while viewing familiar and unfamiliar monkey face images, or while viewing monkey and human face images. No differences were observed in the distribution of viewing times, number of fixations, time into the trial of first saccade to local facial features, and the temporal and spatial characteristics of viewing patterns across the facial images. However, there was a greater probability of re-fixation of the eye region of unfamiliar faces during the first few seconds of the trial suggesting that the eyes are important for the initial encoding of identity. Indeed, the highest fixation density was found in the eye region of all the face images. The viewing duration and the number of fixations per image decreased when inverted or scrambled faces were presented. The eye region in these modified images remained the primary area of fixation. However, the number of fixations directed to the eyes decreased monotonically from the upright images through the inverted versions to the scrambled face images. Nonetheless, the eyes remain the most salient facial substructure regardless of the arrangement of other features, although the extent of salience which they attain may depend both on the low level properties of the eyes and on the global arrangement of facial features.
0014-4819
363-374
Guo, Kun
b0139c51-daaf-4e64-80b3-f8d406338c13
Robertson, Robert
9a5cce23-88d0-4c43-8a12-a2235d16507d
Mahmoodi, Sasan
91ca8da4-95dc-4c1e-ac0e-f2c08d6ac7cf
Tadmor, Yoav
6db9e7fb-e013-40a7-b48c-61a84c5fdc51
Young, Malcolm
50aa9e9e-b773-49e9-ad17-bd4ac57b5ef3
Guo, Kun
b0139c51-daaf-4e64-80b3-f8d406338c13
Robertson, Robert
9a5cce23-88d0-4c43-8a12-a2235d16507d
Mahmoodi, Sasan
91ca8da4-95dc-4c1e-ac0e-f2c08d6ac7cf
Tadmor, Yoav
6db9e7fb-e013-40a7-b48c-61a84c5fdc51
Young, Malcolm
50aa9e9e-b773-49e9-ad17-bd4ac57b5ef3

Guo, Kun, Robertson, Robert, Mahmoodi, Sasan, Tadmor, Yoav and Young, Malcolm (2003) How do monkeys view faces?—a study of eye movements. Experimental Brain Research, 150, 363-374.

Record type: Article

Abstract

Face perception plays a crucial role in primate social communication. We have investigated the pattern of eye movements produced by rhesus monkeys (Macaca mulatta) as they viewed images of faces. Eye positions were recorded accurately using implanted eye coils, while neutral upright, inverted and scrambled images of monkey and human faces were presented on a computer screen. The monkeys exhibited a similar eye scan pattern while viewing familiar and unfamiliar monkey face images, or while viewing monkey and human face images. No differences were observed in the distribution of viewing times, number of fixations, time into the trial of first saccade to local facial features, and the temporal and spatial characteristics of viewing patterns across the facial images. However, there was a greater probability of re-fixation of the eye region of unfamiliar faces during the first few seconds of the trial suggesting that the eyes are important for the initial encoding of identity. Indeed, the highest fixation density was found in the eye region of all the face images. The viewing duration and the number of fixations per image decreased when inverted or scrambled faces were presented. The eye region in these modified images remained the primary area of fixation. However, the number of fixations directed to the eyes decreased monotonically from the upright images through the inverted versions to the scrambled face images. Nonetheless, the eyes remain the most salient facial substructure regardless of the arrangement of other features, although the extent of salience which they attain may depend both on the low level properties of the eyes and on the global arrangement of facial features.

Text
ExpBrainRes.pdf - Version of Record
Download (470kB)

More information

Published date: April 2003
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 265875
URI: http://eprints.soton.ac.uk/id/eprint/265875
ISSN: 0014-4819
PURE UUID: 746981e6-f9b4-4f0b-b86c-404de83e0290

Catalogue record

Date deposited: 10 Jun 2008 09:40
Last modified: 25 Nov 2019 21:01

Export record

Contributors

Author: Kun Guo
Author: Robert Robertson
Author: Sasan Mahmoodi
Author: Yoav Tadmor
Author: Malcolm Young

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×