King-Smith and Carden have postulated a “luminance system” or achromatic channel in the visual system which has a temporal response better than the other channels, and which also responds to high spatial frequencies better than the other channels. All evidence, both psychophysical and electrophysiological, indicates that these properties are contradictory.
© 1978 Optical Society of America
Carl R. Ingling Jr., "Luminance and opponent color contributions to visual detection and to temporal and spatial integration: Comment," J. Opt. Soc. Am. 68, 1143-1146 (1978)