Light adaptation in cat retinal rods

Article Abstract:

The ability of the visual system to change its contrast at various levels of light in order to maintain acuity is the well-known phenomenon of light adaptation. It has long been believed that certain mammalian retinal cells, the rods (the sensory cells of the eye; rods and cones), are unable to demonstrate light adaptation. Studies with monkeys have demonstrated that cones, the cells largely responsible for mammalian vision in low levels of light, are able to make individual adjustment to different levels of light. This data is in direct contrast with lower-vertebrate rods which show light adaptation. The cat is an animal with fewer cones (bright-light cell receptors) than rods and relies more heavily on (night) low-light level vision. In a series of experiments, individual rods of the cat retina were studied on the basis of electrical recordings. These experiments have shown that cat rods, and mammalian rods in general, do adapt to light along the same physiologic avenues as do non-mammalian eyes. However, the level of light adaptation that can be reached through the interplay of the nervous system (the neural network) remains the most important mechanism in light adaptation.

Analysis, Biological research, Vision research, Visual acuity, Visual evoked response, Visual evoked potentials

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Consequences of retinal color coding for cortical color decoding

Article Abstract:

Research on the encoding of color in the retina was interpreted as indicating that mixed cone surrounds present serious difficulties for retinal color coding or cortical color decoding. Arguments for and against this interpretation are presented.

Color vision

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Retinal representations

Article Abstract:

A computer model of geniculate morphogenesis in the rhesus monkey showed a coincidence of laminar fusion and the representation of the blind spot. Arguments concerning the application of the model to other species are presented.

Models, Optic disc, Monkeys as laboratory animals, Laboratory monkeys

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