opponent color

op·po·nent col·or

pairs of color that share color channels in the retina (red-green, blue-yellow, black-white).
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Motion along the black-body locus does not change the fact that it corresponds to a change in the chromaticity of the source, and therefore, according to opponent color theory, should affect brightness perception.
The activation of one opponent color leads to the inhibition of the other opponent color--e.