Evidence for a central component in adaptation to chromatic light
| Autor: | Hitomi Shimakura, Katsuaki Sakata |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Adult
Male genetic structures Binocular summation Computer science Adaptation (eye) 050105 experimental psychology Young Adult 03 medical and health sciences 0302 clinical medicine Vision Monocular Contrast adaptation Humans 0501 psychology and cognitive sciences Chromatic scale Vision Binocular Monocular Adaptation Ocular 05 social sciences Adaptation Physiological eye diseases Sensory Systems Ophthalmology Chromatic adaptation Female sense organs Neuroscience Color Perception Photic Stimulation 030217 neurology & neurosurgery |
| Zdroj: | Vision Research. 159:42-47 |
| ISSN: | 0042-6989 |
| Popis: | Adaptation to environmental light allows our visual system to compensate for dynamic changes in the visual environment for avoiding everyday hazards (e.g., misreading traffic lights) and for accurate reaching. We investigated the hypothesis that adaptation to coloured light is achieved not only via photoreceptors in the retina and monocular contrast adaptation, but also by a binocular process that may occur at the level of the cerebral cortex. In the present study, to determine the role of higher-order cortical binocular processes in adaptation to coloured light, participants were adapted to chromatic light such that the duration of adaptation during monocular processing differed from that during binocular processing. A dichoptic device was used to adapt each eye independently. The extent of after-effects, measured as the distance between the neutral points before and after adaptation to coloured light, depended on the duration of adaptation not only at the monocular level but also at a higher cortical level downstream from binocular fusion. Thus, contrast adaptation to coloured light occurs on at least two levels; it is a result of monocular processes at one level and binocular processes at the other, and each type of process exhibits different temporal characteristics. The results of this study suggest a significant cortical role in adaptation to changes in lighting conditions or the optical environment, including the effects of age on the eye, and the necessity of further investigation to clarify the functional connection between chromatic adaptation by photoreceptors and chromatic adaptation by cortical systems. |
| Databáze: | OpenAIRE |
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