The presence of two spectrally different kinds of rod photoreceptors in amphibians has been hypothesized to enable purely rod-based colour vision at very low light levels. The hypothesis has never ...
Agustín Fernández, "Untitled" (1984), graphite on paper, 30 x 22 1⁄4 inches (© Agustin Fernandez Foundation; photo by Adam Reich) Success! Your account was created and you’re signed in. Please visit ...
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