opsin

n. the protein component of visual photopigments. There is one opsin for all rods (rod opsin, or scotopsin), which together with retinal forms the rod photopigment rhodopsin. There are three different cone opsins (photopsins), which convey different peak wavelength sensitivities to each of the three different cone photopigments (see iodopsin).

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Psychology term of the day

January 19th 2025

dyad (diad)

Sorry, "dyad-diad" is not in the Dictionary of Psychology. Please report to APA if you believe this is an error.