Photoreceptors can have the same output {univariance problem} {problem of univariance} {univariance principle} {principle of univariance} for an infinite number of stimulus frequency-intensity combinations. Different photon wavelengths have different absorption probabilities, from 0% to 10%. Higher-intensity low-probability wavelengths can make same total absorption as lower-intensity high-probability wavelengths. For example, if frequency A has probability 1% and intensity 2, and frequency B has probability 2% and intensity 1, total absorption is same.
Photon absorption causes one photoreceptor molecule to isomerize. Isomerization reactions are the same for all stimulus frequencies and intensities. Higher intensity increases number of reactions.
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1-Consciousness-Sense-Vision-Color Vision
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Date Modified: 2022.0224