Please use this identifier to cite or link to this item:
https://hdl.handle.net/1822/19938
Title: | 1/f -noise in human color vision: the role of S-cone signals |
Author(s): | Medina, José M. Diaz, José A. |
Issue date: | 2012 |
Publisher: | Optical Society of America |
Journal: | Journal of the Optical Society of America A: Optics and Image Science, and Vision |
Abstract(s): | 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-totrial 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 Scone 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 one. 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. |
Type: | Article |
URI: | https://hdl.handle.net/1822/19938 |
DOI: | 10.1364/JOSAA.29.000A82 |
ISSN: | 1084-7529 1520-8532 |
Peer-Reviewed: | yes |
Access: | Restricted access (UMinho) |
Appears in Collections: | CDF - OCV - Artigos/Papers (with refereeing) |
Files in This Item:
File | Description | Size | Format | |
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MedinaDiazJOSAARev28.pdf Restricted access | 199,63 kB | Adobe PDF | View/Open |