Discrimination of spatial phase: The roles of luminance distribution and attention
| Autor: | Endel Põder |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Adult
Male Light Computer science media_common.quotation_subject Stimulus (physiology) Luminance 050105 experimental psychology Contrast Sensitivity 03 medical and health sciences Young Adult 0302 clinical medicine Perception Humans 0501 psychology and cognitive sciences Attention media_common Visual search business.industry 05 social sciences Histogram matching Pattern recognition Sensory Systems Luminance distribution Visual field Ophthalmology Pattern Recognition Visual Spatial ecology Female Artificial intelligence Cues Visual Fields business 030217 neurology & neurosurgery |
| Zdroj: | Vision research. 150 |
| ISSN: | 1878-5646 |
| Popis: | We can easily discriminate certain phase relations in spatial patterns but not others. Phase perception has been found different in the fovea vs. periphery, and for single patterns vs. textures. Different numbers of mechanisms have been proposed to account for the regularities of phase perception. In this study, I attempt to better understand the mechanisms behind discrimination of spatial phase. In order to reveal the role of luminance cues, I use histogram matching of patterns with different phases. Possible effects of attention were studied using visual search experiments with varied stimulus set size. Simple and compound Gabor patches, broadband lines and edges, and textures composed of those patterns were used as stimuli. The experiments indicate that phase discrimination is mediated by two mechanisms. The first uses luminance differences and operates pre-attentively, in parallel across the visual field. The second compares relative positions of dark and bright segments within an image, and is strictly limited by capacity of attention. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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