medium-wavelength pigment

the photopigment, present in one of the three populations of retinal cones, that has maximum sensitivity to a wavelength of 531 nm. The absence of the gene for the medium-wavelength pigment causes deuteranopia (red–green color blindness). See also long-wavelength pigment; short-wavelength pigment.

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Psychology term of the day

December 18th 2024

forward conditioning

forward conditioning

in classical conditioning, the pairing of two stimuli such that the conditioned stimulus is presented before the unconditioned stimulus. Also called forward pairing. Compare backward conditioning.