This project will compare the stereoscopic mechanisms in human vision which process disparity for the perception of depth to those which control horizontal eye vergence, in order to attain an integrated understanding of sensory and motor processing of retinal disparity. The knowledge gained will lead eventually to the treatment of binocular visual disorders. A model for the processing of static disparity in dynamic random-dot stereograms is developed based on previous psychophysical experiments. The model describes the stimulus to disparity processing mechanisms as the cross-correlation product of edge information in spatially-filtered left and right retinal images. The model further proposes a set of disparity-tuned interocular correlation detectors whose tuning widths increase and whose sensitivities decrease with disparity. Proposed experiments test this model with regard to the processing of disparity in dynamic random-dot stereograms for the control of vergence eye movements. The accuracy of continuous sinusoidal vergence tracking is measured as a function of the interocular correlation and luminance contrast of the stereogram stimuli, to assess the validity of the model's definition of signal strength with respect to vergence. The amplitude and latency of step vergence responses is measured under conditions of adaptation which are known to desensitize disparity-tuned channels, to assess the applicability of the model's channel descriptions with respect to vergence.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
1R01EY008882-01
Application #
3266228
Study Section
Visual Sciences B Study Section (VISB)
Project Start
1991-01-01
Project End
1993-12-31
Budget Start
1991-01-01
Budget End
1991-12-31
Support Year
1
Fiscal Year
1991
Total Cost
Indirect Cost
Name
University of California Berkeley
Department
Type
Schools of Optometry/Ophthalmol
DUNS #
094878337
City
Berkeley
State
CA
Country
United States
Zip Code
94704
Keay, Lisa; Edwards, Katie; Stapleton, Fiona (2009) Signs, symptoms, and comorbidities in contact lens-related microbial keratitis. Optom Vis Sci 86:803-9
Schor, Clifton M (2009) Charles F. Prentice award lecture 2008: surgical correction of presbyopia with intraocular lenses designed to accommodate. Optom Vis Sci 86:E1028-41
Schor, Clifton M (2009) Neuromuscular plasticity and rehabilitation of the ocular near response. Optom Vis Sci 86:E788-802
Cantor, Christopher R L; Schor, Clifton M (2007) Stimulus dependence of the flash-lag effect. Vision Res 47:2841-54
Schreiber, Kai M; Schor, Clifton M (2007) A virtual ophthalmotrope illustrating oculomotor coordinate systems and retinal projection geometry. J Vis 7:4.1-14
Schreiber, Kai M; Tweed, Douglas B; Schor, Clifton M (2006) The extended horopter: quantifying retinal correspondence across changes of 3D eye position. J Vis 6:64-74
Berends, Ellen M; Liu, Baoxia; Schor, Clifton M (2005) Stereo-slant adaptation is high level and does not involve disparity coding. J Vis 5:71-80
Liu, Baoxia; Schor, Clifton M (2005) Effects of partial occlusion on perceived slant difference. J Vis 5:969-82
Liu, Baoxia; Berends, Ellen M; Schor, Clifton M (2005) Adaptation to the induced effect stimulus normalizes surface slant perception and recalibrates eye position signals for azimuth. J Vis 5:808-22
Zhang, Zhi-Lei; Cantor, Christopher; Ghose, Tandra et al. (2004) Temporal aspects of spatial interactions affecting stereo-matching solutions. Vision Res 44:3183-92

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