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dc.contributor.authorZlatkute, Giedre
dc.contributor.authorSagnay de la Bastida, Vanessa Charlotte
dc.contributor.authorVishwanath, Dhanraj
dc.identifier.citationZlatkute , G , Sagnay de la Bastida , V C & Vishwanath , D 2020 , ' Unimpaired perception of relative depth from perspective cues in strabismus ' , Royal Society Open Science , vol. 7 , no. 12 , 200955 .
dc.identifier.otherPURE: 271487953
dc.identifier.otherPURE UUID: 939eeff9-5a6d-4144-8d2a-3aefc2b0ca87
dc.identifier.otherORCID: /0000-0002-8095-0537/work/86986891
dc.identifier.otherWOS: 000603590400001
dc.identifier.otherScopus: 85099708864
dc.descriptionThis work was supported by the Engineering and Physical Sciences Research Council (grant no. EP/M506631/1). It was part of the grant submitted by D.V., which covered PhD scholarship for G.Z.en
dc.description.abstractStrabismus is a relatively common ophthalmological condition where the coordination of eye muscles to binocularly fixate a single point in space is impaired. This leads to deficits in vision and particularly in three-dimensional (3D) space perception. The exact nature of the deficits in 3D perception is poorly understood as much of understanding has relied on anecdotal reports or conjecture. Here, we investigated, for the first time, the perception of relative depth comparing strabismic and typically developed binocular observers. Specifically, we assessed the susceptibility to the depth cue of perspective convergence as well as the capacity to use this cue to make accurate judgements of relative depth. Susceptibility was measured by examining a 3D bias in making two-dimensional (2D) interval equidistance judgements and accuracy was measured by examining 3D interval equidistance judgements. We tested both monocular and binocular viewing of images of perspective scenes under two different psychophysical methods: two-alternative forced-choice (2AFC) and the method of adjustment. The biasing effect of perspective information on the 2D judgements (3D cue susceptibility) was highly significant and comparable for both subject groups in both the psychophysical tasks (all ps < 0.001) with no statistically significant difference found between the two groups. Both groups showed an underestimation in the 3D task with no significant difference between the group's judgements in the 2AFC task, but a small statistically significant difference (ratio difference of approx. 10%, p = 0.016) in the method of adjustment task. A small but significant effect of viewing condition (monocular versus binocular) was revealed only in the non-strabismic group (ratio difference of approx. 6%, p = 0.002). Our results show that both the automatic susceptibility to, and accuracy in the use of, the perspective convergence cue in strabismus is largely comparable to that found in typically developed binocular vision, and have implications on the nature of the encoding of depth in the human visual system.
dc.relation.ispartofRoyal Society Open Scienceen
dc.rightsCopyright © 2020 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited.en
dc.subjectPerspective cueen
dc.subjectPictorial perceptionen
dc.subjectDepth perceptionen
dc.subjectThree-dimensional visionen
dc.subjectBF Psychologyen
dc.titleUnimpaired perception of relative depth from perspective cues in strabismusen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Psychology and Neuroscienceen
dc.contributor.institutionUniversity of St Andrews. Institute of Behavioural and Neural Sciencesen
dc.contributor.institutionUniversity of St Andrews. School of Medicineen
dc.description.statusPeer revieweden

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