The importance of procedure to stereopsis in random-dot stereograms

Chin Yan Jackie Yuen (2010). The importance of procedure to stereopsis in random-dot stereograms Honours Thesis, School of Psychology, The University of Queensland.

       
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Author Chin Yan Jackie Yuen
Thesis Title The importance of procedure to stereopsis in random-dot stereograms
School, Centre or Institute School of Psychology
Institution The University of Queensland
Publication date 2010
Thesis type Honours Thesis
Supervisor Grove, Philip
Total pages 9
Abstract/Summary Conventional models of binocular depth perception (stereopsis) hypothesise that depth perception results from the brain matching corresponding retinal points and computing the differences in image positions on the two retinas. However it is now acknowledged that stereopsis is more complex and cannot be explained by binocular matching alone. Importantly, monocular features arise when objects and surfaces at different distances from the observer occlude one another to different extents in the two eyes. These features are seen by only one eye and therefore have no match in the other eye. Gillam and Borsting (1988) reported that depth was perceived faster when the stimulus (random-dot stereogram) contained texture in the monocular occlusion zone than when texture was absent. Such facilitation of depth perception by monocular features has been demonstrated in various other contexts such as phantom stereopsis and monocular gap stereopsis. Nevertheless Grove and Ono (1999) failed to replicate Gillam and Borsting and have produced contradicting results, showing that same-textured monocular occlusion zones facilitated no more depth than ‘texture-less’ monocular occlusion zones. This thesis aimed to investigate the stimulus and procedural differences between the studies, such as texture (dot density), disparities, and eye movements (vergence) that might be responsible for this discrepancy. Despite three separate attempts there remains no evidence implicating differences in dot densities or disparities as the cause for the differing results between Gillam and Borsting and Grove and Ono. Moreover across all three experiments no significant differences were observed between monocular zone filled and absent conditions in influencing the speed of correct identification of depth in random-dot stereograms. Significant main effects of texture density and disparity were found. The author of this thesis suggests perhaps the size of monocular gap, the method of testing as well as fusional limit might explain these findings.

 
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