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Didzis Lauva; Neural interaction of retinal aftereffects and contrast adaptation in perception of gabor gratings. Journal of Vision 2008;8(17):73. doi: 10.1167/8.17.73.
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Contrast sensitivity adaptation to high contrast Gabor gratings and recovery after removal of stimuli were studied using two techniques to find the contrast gain time dependencies and to separate visual cortex and retinal contribution in the total contrast gain. Stimuli were Gabor gratings within the adaptation phase (0–10sec), and similar low contrast gratings (spatially inphase and antiphase) in the test phase used for studies of contrast adaptation recovery. Measurements were done in two conditions. First, looking either with the same eyes during adaptation and relaxation phases. Secondly, by stimulation of one eye during adaptation and measuring relaxation for the second eye using haploscopic mirror system for the left and right eye stimuli separation. Afterwards temporal adaptation characteristics were studied when adaptation stimuli central part for the test phase was replaced by a low contrast grating either inphase or spatially 180 deg shifted according to the rest area of stimulus. Two characteristic times depending on adaptation and test stimuli contrasts were determined: a) shorter relaxation time of retinal aftereffects
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