The detectability of a brief color shift towards red or towards green of a foveally viewed yellow target is less by 25% if the observer is uncertain as to the direction of the color shift. This result matches a prediction of the theory of signal detectability: When signal parameters become uncertain, detectability declines.
© 1978 Optical Society of America
Daniel S. Greenhouse and Theodore E. Cohn, "Effect of chromatic uncertainty on detectability of a visual stimulus," J. Opt. Soc. Am. 68, 266-267 (1978)