EXCRETORY SYSTEM
CORTEX
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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relies on orientational selectivity of simple cells
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relies on red-green opponency
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was discovered by Newton
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means that any one category of photoreceptor cannot signal any information about the wavelength of the light
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Detailed explanation-1: -The principle states that one and the same visual receptor cell can be excited by different combinations of wavelength and intensity, so that the brain cannot know the color of a certain point of the retinal image.
Detailed explanation-2: -What is the problem of univariance in photoreceptors? the fact that an infinite set of different wavelength-intensity combos can elicit exactly the same response from a single type of photoreceptor. The level of activity of a single receptor can not determine color by itself.
Detailed explanation-3: -The principle of univariance. The principle of univariance states that very different wavelengths of light may elicit the same response from a photoreceptor, indicating that a single photoreceptor would not be able to tell the difference between some colors.