Because the new dimension of red-green color vision was closely timed with the appearance of expression of the new visual pigment transgene, we conclude that neural rewiring was not associated with the change in color vision. Rather, the new visual pigment took advantage of pre-existing visual circuitry and altered its spectral response characteristics to automatically give rise to a new dimension of color.
What is the neural circuitry for color vision? Hundreds of years of color vision and color matching experiments have established that the four main hue percepts (blue, yellow, red, and green) involve contributions from all three cone types, short- (S), middle- (M), and long- (L) wavelength-sensitive. Theories of color vision have focused on cell types recorded physiologically in the retina and LGN with S vs. (L+M) and L vs. M signatures. As a result, textbooks have attributed blue-yellow and red-green perceptions to the respective cells containing these signals. Importantly it must be emphasized the physiology of these cell types do not match the spectral characteristics of human perception. It is possible hue perception is based on cells in the retina matching the spectral signatures of human color vision.
In understanding color vision it helps to first consider reduced systems with fewer cone types and fewer percepts. In dichromatic animals, retinas are composed of either S- and M-cones (protanope) or S- and L-cones (deuteranope) as shown in the figure below. When behaviorally tested these animals demonstrate the ability to discriminate blues and yellows, whereas greens and reds are indistinguishable from gray.
Because the new dimension of red-green color vision was closely timed with the appearance of expression of the new visual pigment transgene, we conclude that neural rewiring was not associated with the change in color vision. Rather, the new visual pigment took advantage of pre-existing visual circuitry and altered its spectral response characteristics to automatically give rise to a new dimension of color. What is the neural circuitry for color vision? Hundreds of years of color vision and color matching experiments have established that the four main hue percepts (blue, yellow, red, and green) involve contributions from all three cone types, short- (S), middle- (M), and long- (L) wavelength-sensitive. Theories of color vision have focused on cell types recorded physiologically in the retina and LGN with S vs. (L+M) and L vs. M signatures. As a result, textbooks have attributed blue-yellow and red-green perceptions to the respective cells containing these signals. Importantly it must be emphasized the physiology of these cell types do not match the spectral characteristics of human perception. It is possible hue perception is based on cells in the retina matching the spectral signatures of human color vision.In understanding color vision it helps to first consider reduced systems with fewer cone types and fewer percepts. In dichromatic animals, retinas are composed of either S- and M-cones (protanope) or S- and L-cones (deuteranope) as shown in the figure below. When behaviorally tested these animals demonstrate the ability to discriminate blues and yellows, whereas greens and reds are indistinguishable from gray.
การแปล กรุณารอสักครู่..
