Abstract
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 revive a rod afterimage, an increase of background intensity must exceed the increment threshold of the rods. To examine the effects of cone bleaching upon rod sensitivity, dark adaptation curves following red and green bleaching exposures equal for rods are compared. The curves are indistinguishable.
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