Abstract
The presence or absence of a Stiles-Crawford effect serves as an indicator of whether or not electrical activity originating in the retina has been initiated by cones. The retinal illuminance required to produce a criterion height of electrical response is determined when light enters at different points along the horizontal diameter of the pupil. Both low (4 c/s) and high (25 c/s) rates of on-off flicker are used, in addition to a moving barred stimulus pattern. Lights from three different parts of the spectrum (660 nm, 550 nm, and 495 nm) are utilized. The Stiles-Crawford effect appears in both the electrical and the psychophysical data under conditions that are designed to produce photopic stimulation of the eye.
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