Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"spatial vision"”.
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Perceptual learning in foveal and peripheral contrast discrimination: exploring the effects of stimuli on learning and the effects of learning on spatial vision
… Perceptual learning has been shown to improve spatial vision in amblyopia but has not previously been employed to investigate crowding in amblyopia. The purpose of this work was to investigate the effect of surrounding stimuli parameters on crowding and perceptual learning (PL), and the effect …
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Contrast Sensitivity to One- and Two-Dimensional Luminance Patterns
… receptive field model combined with watershed spatial vision behavior at spatial frequencies below 1 cycle-per-degree (cpd). The non-significant result for space-averaged luminance was explained by the limited range of manipulation of the variable. Two-dimensional luminance patterns were …
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Seeing by moving: revisiting pattern vision through fixational eye movements
… acquired during fixations. These images are then spatially decomposed into their basic components, which form the fundament of visual perception. Understanding these spatial mechanisms has been a central aim of pattern vision, and has led to a successful and widely adopted standard model of …
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Examining Visual Masking in Target Aquisition Uning Two-dimensional Fourier Analysis Techniques
Spatial vision refers to a general class of perceptual capabilities that allows people to see the structure of objects within an image or visual scene. For example, spatial vision underlies people's abilities to discriminate important objects (or so-called "targets") from less important …
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Display spatial luminance nonuniformities: effects on operator performance and perception
This dissertation examined the effects of display spatial luminance nonuniformities on operator performance and perception. The objectives of this research were to develop definitions of nonuniformity, develop accurate measurement techniques, determine acceptable levels of nonuniformities, and to …
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A human spatial-chromatic vision model for evaluating electronic displays
… noise measurements be weighted in terms of human spatial-chromatic visual characteristics. A review of extant image quality metrics reveals several limitations of these metrics which make them unsuitable for the evaluation of color matrix displays. These limitations include the inability to …
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Sensory Ecology of Foraging in Bumblebees
… I related these findings to temporal and spatial limitations of different neuronal channels involved in stimulus detection and recognition. Bumblebees do not only possess species-specific sensory capacities but they also exhibit inter-individual differences due to size. Therefore, in the …
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Characterization of the Role of R7-RGS Proteins in Mammalian Retina and Vision
… of RGS7-family Proteins in Mammalian Retina and Vision</p><p>by</p><p>Matthew David Cain</p><p>Doctor of Philosophy in Biology and Biomedical Sciences</p><p>Molecular Cell Biology</p><p>Washington University in St. Louis, 2014</p><p>Professor Kendall J. Blumer, Chairperson</p><p>GPCR/G protein …
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The effect of aberrations and light scatter on visual performance at photopic and mesopic light levels
… (CAA) test was developed to assess the minimum spatial vision requirements for commercial pilots. The goal of the CAA test was for it to be sensitive to retinal image degradation in subjects who had undergone excimer laser refractive surgery. Increased aberrations and scattered light or abnormal …