Impairment of cyclopean surface processing by disparity-defined masking stimuli
| Autor: | Paul B. Hibbard, Ross Goutcher |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Vision Disparity
Computer science media_common.quotation_subject Perceptual Masking Stimulus (physiology) Surface processing Article 050105 experimental psychology Monocular depth cues 03 medical and health sciences Imaging Three-Dimensional 0302 clinical medicine Perception parasitic diseases Psychophysics Humans 0501 psychology and cognitive sciences Orientation Spatial media_common Depth Perception Vision Binocular cyclopean vision business.industry disparity measurement 05 social sciences relative disparity Pattern recognition 3D shape Sensory Systems Form Perception Ophthalmology Amplitude Binocular disparity Artificial intelligence Cues business 030217 neurology & neurosurgery |
| Zdroj: | Journal of Vision |
| ISSN: | 1534-7362 |
| DOI: | 10.1167/jov.20.2.1 |
| Popis: | Binocular disparity signals allow for the estimation of three-dimensional shape, even in the absence of monocular depth cues. The perception of such disparity-defined form depends, however, on the linkage of multiple disparity measurements over space. Performance limitations in cyclopean tasks thus inform us about errors arising in disparity measurement and difficulties in the linkage of such measurements. We used a cyclopean orientation discrimination task to examine the perception of disparity-defined form. Participants were presented with random-dot sinusoidal modulations in depth and asked to report whether they were clockwise or counter-clockwise rotated. To assess the effect of different noise structures on measurement and linkage processes, task performance was measured in the presence of binocular, random-dot masks, structured as either antiphase depth sinusoids, or as random distributions of dots in depth. For a fixed number of surface dots, the ratio of mask-to-surface dots was varied to obtain thresholds for orientation discrimination. Antiphase masks were found to be more effective than random depth masks, requiring a lower mask-to-surface dot ratio to inhibit performance. For antiphase masks, performance improved with decreased cyclopean frequency, increased disparity amplitude, and/or an increase in the total number of stimulus dots. Although a cross-correlation model of disparity measurement could account for antiphase mask performance, random depth masking effects were consistent with limitations in relative disparity processing. This suggests that performance is noise-limited for antiphase masks and complexity-limited for random masks. We propose that use of differing mask types may prove effective in understanding these distinct forms of impairment. |
| Databáze: | OpenAIRE |
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