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Looking at the task in hand: vergence eye movements and perceived size

Mon-Williams, M., Tresilian, J.R., Plooy, A., Wann, J.P. and Broerse, J. (1997) Looking at the task in hand: vergence eye movements and perceived size. Experimental Brain Research, 117 (3). pp. 501-506. ISSN 0014-4819

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Abstract

A retinal afterimage of the hand changes size when the same unseen hand is moved backwards and forwards in darkness. We demonstrate that arm movements per se are not sufficient to cause a size change and that vergence eye movements are a necessary and sufficient condition for the presence of the illusory size change. We review previous literature to illustrate that changing limb position in the dark alters vergence angle and we explain the illusion via this mechanism. A discussion is provided on why altering limb position causes a change in vergence and we speculate on the underlying mechanisms.

Item Type: Article
Keywords: vergence; depth perception; illusion; accommodation; Emmert's law
Academic Units: The University of Leeds > Faculty of Medicine and Health (Leeds) > Institute of Psychological Sciences (Leeds) > Cognitive Psychology (Leeds)
Depositing User: Repository Officer
Date Deposited: 18 Jun 2009 11:11
Last Modified: 29 Sep 2010 14:24
Published Version: http://dx.doi.org/10.1007/s002210050246
Status: Published
Publisher: Springer Verlag
Identification Number: 10.1007/s002210050246
URI: http://eprints.whiterose.ac.uk/id/eprint/8711

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