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https://hdl.handle.net/1822/19938
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Campo DC | Valor | Idioma |
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dc.contributor.author | Medina, José M. | - |
dc.contributor.author | Diaz, José A. | - |
dc.date.accessioned | 2012-07-17T17:15:38Z | - |
dc.date.available | 2012-07-17T17:15:38Z | - |
dc.date.issued | 2012 | - |
dc.identifier.issn | 1084-7529 | por |
dc.identifier.issn | 1520-8532 | por |
dc.identifier.uri | https://hdl.handle.net/1822/19938 | - |
dc.description.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-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. | - |
dc.description.sponsorship | This work was supported by the Center for Physics, University of Minho, Portugal. | por |
dc.language.iso | eng | por |
dc.publisher | Optical Society of America | por |
dc.rights | restrictedAccess | por |
dc.title | 1/f -noise in human color vision: the role of S-cone signals | por |
dc.type | article | por |
dc.peerreviewed | yes | por |
sdum.publicationstatus | published | por |
oaire.citationStartPage | A82 | por |
oaire.citationEndPage | A95 | por |
oaire.citationIssue | 2 | por |
oaire.citationVolume | 29 | por |
dc.identifier.doi | 10.1364/JOSAA.29.000A82 | - |
dc.identifier.pmid | 22330409 | por |
dc.subject.wos | Science & Technology | por |
sdum.journal | Journal of the Optical Society of America A: Optics and Image Science, and Vision | por |
Aparece nas coleções: | CDF - OCV - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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MedinaDiazJOSAARev28.pdf Acesso restrito! | 199,63 kB | Adobe PDF | Ver/Abrir |