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Invertebrate Color Vision and the Tuned-Receptor Paradigm

Modern statements of this notion generally identify Palmer's and Young's "particles" as "light sensitive pigments." This identification involves a concept which is related to but distinct from the tuning notion. Another related concept is that more than one receptor is needed to subserve color vision. Information about color is not extracted from the response of one receptor but by comparing the relative responses of receptors which differ in their sensitivities to different spectral stimuli. As will be seen below, this latter concept is also distinct from the tuning notion.