1/f Noise in human color vision: the role of S-cone signals

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
José M Medina, José A Díaz

Abstract

We examine the functional role of S-cone signals on reaction time (RT) variability in human color vision. Stimuli were selected along red-green and blue-yellow cardinal directions and at random directions in the isoluminant plane of the color space. Trial-to-trial RT variability was not statistically independent but correlated across experimental conditions and exhibited 1/f noise spectra with an exponent close to unity in most of the cases. Regarding contrast coding, 1/f noise for random chromatic stimuli at isoluminance was similar to that for achromatic stimuli, thus suggesting that S-cone signals reduce variability of higher order color mechanisms. If we regard spatial coding, the effect of S-cone density in the retina on RT variability was investigated. The magnitude of 1/f noise at 16 min of arc (S-cone free zone) was higher than at 90 min of arc in the blue-yellow channel, and it was similar for the red-green channel. The results suggest that S-cone signals are beneficial and they modulate 1/f noise spectra at postreceptoral stages. The implications related to random multiplicative processes as a possible source of 1/f noise and the optimal information processing in color vision are discussed.

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Citations

Aug 28, 2014·Frontiers in Human Neuroscience·José M MedinaKenneth H Norwich
Dec 21, 2012·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Derya AkkaynakRoger T Hanlon
Apr 4, 2014·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Andrew J ZeleDingcai Cao
Oct 6, 2012·Optics Express·José M Medina, José A Díaz

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