Abstract
Frog on-off retinal ganglion cells react to diffuse, large-sized stimuli not only with an “early response” and a “delayed response” but also with a “second off-response”. The intensity at which the delayed response becomes visible coincides with the quantum amount necessary for saturating the red rod response. The spectral sensitivity of the delayed response fits the nomogram for the 502 nm pigment. Unlike the delayed response, the second off-response appears earlier with increasing stimulus intensity and follows the 433 nm nomogram. Therefore, it is most probably generated by the green rods.
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