A receptor's response can be summarized by a single number that specifies the amount of light absorbed. This is called

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The univariance principle states that a receptor's response to light can be summarized by a single number specifying the amount of light absorbed, regardless of the specific wavelengths involved. This principle underlies the fact that a receptor cannot independently determine both the intensity and wavelength of light, only the total amount of light absorbed.

A Receptor's Response Can Be Summarized by a Single Number