Titlebook: Sensory System I; Vision and Visual Sy Richard Held Book 1988 Springer Science+Business Media New York 1988 medicine.neurology.neuroscience

Ischemia

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Color Vision and Retinex Theory,e the explanations of color constancy by Helmholtz and those who have followed him during the last Century because, as the following experiments show, the paradox does not really exist: The color of an object is not determined by the composition of the light Coming from the object.

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Cone Photoreceptors, Color Specificities,rbance maxima lie at 625, 530, and 455 nm in the goldfish; 623, 522, and 462 nm in the turtle; 567, 514, and 461 in the pigeon; 567, 535, and 415 in the monkey (.); and 558, 531, and 419 nm in the human. These varieties of absorbance maxima are probably related to the adaptation to the light environment of the habitats.

Commonplace

Blindness, Neural Prosthesis,pot was small and lay in the half of the visual field opposite to the hemisphere that was stimulated. The position of the light varied with the part of the hemisphere stimulated. One of these early patients had been hemianopic for 8 years. Electrical Stimulation caused him to see lights in the blind half of his field of vision.