Figure 6.

Measured photoreceptor responses at increasing levels of light adaptation. Photoreceptor (macaque rod) responses under dark-adapted conditions (solid curve) and at increasing levels of light adaptation (dashed curves). The dark-adapted curve corresponds to the no-feedback or essentially-no-feedback condition; the light-adapted curves correspond to increasing levels of feedback. Adapted from Schneeweis and Schnapf (2000) Noise and light adaptation in rods of the macaque monkey. Visual Neuroscience 17, pp. 659–666, with permission of the publisher, Cambridge University Press. Curves are peak-normalized and inverted so that light responses are plotted up.