Dark adaptation and increment threshold in a rod monochromat.
نویسندگان
چکیده
منابع مشابه
Rod-mediated increment threshold functions in infants.
PURPOSE To obtain and analyze scotopic increment threshold functions to test the hypothesis that rod photoreceptor immaturity accounts for the elevation of infants' over controls' dark-adapted thresholds and elevation of parafoveal over peripheral thresholds in infants. METHODS Using a preferential looking method, thresholds for detection of 2(o), 50 msec, blue stimuli presented 10(o) (parafo...
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The afterimages visible after cones have recovered in dark adaptation fade against any steady background, but may be revived by a sudden change in the intensity or wavelength of the background. However, when a change of background wavelength is not detectable by rods, it does not revive such an afterimage. showing that sensitivity to cone stimuli has not been affected by bleaching the rods. To ...
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The time course of rod dark adaptation was measured in 12 patients and carriers of retinitis pigmentosa (RP). In contrast to previous studies the rod absolute threshold was determined prior to any exposure to the bleaching light. For seven of the patients and carriers the recovery of rod sensitivity to the prebleach level was prolonged, with the delay ranging from mild to severe. The prolongati...
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Increment thresholds of a rod monochromat were obtained over a wide range of background luminances. Within each experimental session, visualevoked cortical potentials (VECP's) were computed at several luminance levels above the increment threshold for each background level. The results indicate that as the background level approached 1,000 scotopic trolands (td.), the VECP began to decrease in ...
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The sensitivity to sine-wave flicker of a rod monochromat was compared with that of a normal subject at photopic and scotopic levels of luminance. The sensitivity of the rod monochromat in the low-frequency region (below 3 Hz at scotopic levels and below 12 to 14 Hz at photopic levels) was found to be superior to that of the control. This superiority was most pronounced at photopic levels, wher...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1965
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1965.sp007786