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It was tested whether or not early experience is necessary for color perception. Infant monkeys were reared for nearly a year in a separate room where the illumination came from only monochromatic lights. After extensive training, they were able to perform color matching. But, their judgment of color similarity was quite different from that of normal animals. Furthermore, they had severe deficits in color constancy; their color vision was very much wavelength-dominated, so they could not compensate for the changes in wavelength composition. These results indicate that early visual experience is also indispensable for normal color perception.
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Color identification. A, Schematic illustration of stimuli. B, 20 Munsell chips as stimuli. C-F, Normal monkeys’ responses under the illumination where the x- and y values of a white chip (N9.5) were 0.331 and 0.331. G-J, Color deprived monkeys’ responses under the same illumination as c-f. K-N, Normal monkeys’ responses under the illumination where the x- and y values of a yellow chip (5Y) were equivalent to those of a red chip (5R) in c-j. O-R, Color deprived monkeys’ responses under the same illumination as k-n. Responses to each chip were represented as a diameter of a circle and plotted at the position that corresponds to the Munsell Color Order System.
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| Relational Information |
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AIST Today Vol. 4, No.11 (2004) 20
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