منابع مشابه
Color discrimination at threshold: the approach through increment threshold sensitivity.
A close correlation between Stiles's increment threshold (pi-mechanism) approach and color discrimination at threshold was found: a sharp transition from detection of two lights via two pi-mechanisms (pi 1 and pi 4) to detection via only one pi-mechanism (pi 1) was paralleled by a sharp decline from excellent discrimination between those two lights (even with the rods bleached) to no discrimina...
متن کاملRod-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...
متن کاملIncrement Threshold Functions in Retinopathy of Prematurity
PURPOSE To assess scotopic background adaptation in subjects with a history of preterm birth and retinopathy of prematurity (ROP). Retinopathy of prematurity is known to have long-term effects on rod photoreceptor and rod mediated postreceptor retinal function. METHODS Rod-mediated thresholds for detection of 3° diameter, 50 ms stimuli presented 20° from fixation were measured using a spatial...
متن کاملA comparison of psychophysical and VECP increment threshold functions of a rod
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 ...
متن کاملIncrement threshold and detection latency in the rod and cone systems.
It was reported previously that increment-threshold functions obtained in the dark-adapted rod and cone systems have two distinct branches, and that these functions are predicted by a simple model similar to those developed to describe vertebrate reaptor responses. The model also makes several unusual predictions concerning the latency for detection of the increment field at threshold. These pr...
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ژورنال
عنوان ژورنال: Perception & Psychophysics
سال: 1981
ISSN: 0031-5117,1532-5962
DOI: 10.3758/bf03207292