Granit theory of color vision

a theory that the perception of color relies on the activation of three types of cells: (a) scotopic dominators, which are retinal rods most sensitive to wavelengths of 500 nm; (b) photopic dominators, which are retinal cones most sensitive to wavelengths of 560 nm; and (c) photopic modulators, other cones sensitive to very narrow frequency ranges. [Ragnar Arthur Granit (1900–1991), Finnish-born Swedish physiologist]

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Psychology term of the day

January 24th 2025

heteronymous hemianopia

a visual field defect in which vision in either the left or right half of both eyes is absent due to a lesion in the optic chiasm. See hemianopia.