First and Second Order Stereoscopic Processing of Fused and Diplopic Targets

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dc.contributor.advisorWilcox, Laurie M.
dc.creatorStransky, Debi
dc.date.accessioned2015-08-28T15:06:25Z
dc.date.available2015-08-28T15:06:25Z
dc.date.copyright2014-09-11
dc.date.issued2015-08-28
dc.date.updated2015-08-28T15:06:25Z
dc.degree.disciplinePsychology (Functional Area: Brain, Behaviour & Cognitive Science
dc.degree.levelDoctoral
dc.degree.namePhD - Doctor of Philosophy
dc.description.abstractDepth from stereopsis is due to the positional difference between the two eyes, which results in each eye receiving a different view of the world. Although progress has been made in understanding how the visual system processes stereoscopic stimuli, a number of questions remain. The goal of this work was to assess the relationship between the perceptual, the temporal and the 1st- /2nd- order dichotomies of stereopsis and in doing so, determine an appropriate method for measuring depth from large disparities. To this end, stereosensitivity and perceived depth were assessed using 1st- and 2nd- order stimuli over a range of test disparities and conditions. The main contributions of this research are as follows: 1) The sustained/transient dichotomy proposed by Edwards, Pope and Schor (2000) is best considered in terms of the spatial dichotomy proposed by Hess and Wilcox (1994). At large disparities it is not possible to categorize performance based on exposure duration alone; 2) There is not a simple correspondence between Ogle's (1952) patent / qualitative perceptual categories and the 1st- /2nd- order dichotomy proposed by Hess and Wilcox (1994); 3) Quantitative depth is provided by both 1st- and 2nd- order mechanisms in the fused range, but only the 2nd- order signal is used when stimuli are diplopic; 3) The quantitative depth provided by a 2nd- order stimulus scales with envelope size; and 4) The monoptic depth phenomenon may be related to depth from diplopic stimuli, but for conditions tested here when both monoptic depth and 2nd- order stereopsis are available, the latter is used to encode depth percepts. The results reported here expand on earlier work on 1st- and 2nd- order stereopsis and address the issues in the methodologies used to study depth from large disparities. These results are consistent with the widely accepted filter-rectify-filter model of 2nd- order processing, and 1st- and 2nd- order stimuli are likely encoded by disparity-sensitive neurons via a two-stream model (see Wilson, Ferrera, and Yo (1992); Zhou and Baker (1993)).
dc.identifier.urihttp://hdl.handle.net/10315/29941
dc.language.isoen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectExperimental psychology
dc.subjectPsychology
dc.subjectNeurosciences
dc.subject.keywordsStereopsis
dc.subject.keywordsStereoscopic 3D
dc.subject.keywords1st- order
dc.subject.keywords2nd- order
dc.subject.keywordsNon-linear mechanism
dc.subject.keywordsFused
dc.subject.keywordsFusion
dc.subject.keywordsDiplopic
dc.subject.keywordsDiplopia
dc.subject.keywordsDepth
dc.subject.keywordsDisparity
dc.subject.keywordsMetric depth
dc.subject.keywordsDepth estimation
dc.subject.keywordsStereoacuity
dc.subject.keywordsStereosensitivity
dc.subject.keywordsSpatial dichotomy
dc.subject.keywordsMonoptic depth
dc.titleFirst and Second Order Stereoscopic Processing of Fused and Diplopic Targets
dc.typeElectronic Thesis or Dissertationen_US

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