Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/18413
Título: | Response variability of the red-green color vision system using reaction times |
Autor(es): | Medina, José M. Díaz, José A. |
Palavras-chave: | Human color vision Isoluminance Spatial summation Color-opponent cells Reaction time Internal noise Hazard function Random multiplicative process |
Data: | Mai-2011 |
Editora: | Society of Photo-optical Instrumentation Engineers |
Revista: | Proceedings of SPIE |
Resumo(s): | We have studied the intrinsic variability of color coding by examining the temporal fluctuations of chromatic-opponent neurons at the large scale. Simple reaction times were measured for stimuli selected along the red-green direction in the isoluminant plane of the human color space (S-cone constant or L-M axis). Stimulus size also changed from 8 minutes of arc to 10 degrees. Fluctuations increased as the mean reaction time increased and showed a bi-linear scaling function. The coefficient of variation was always lower than predicted by a Poisson process. The variability decreased as a function of the chromatic contrast and as a function of the stimulus size. The analysis of the hazard functions was consistent with power-law dominant random processes at low stimulus size and low contrasts and log-normal dominant processes at high contrasts. Our results conclude that response variability is signal-dependent and evidence for a random multiplicative process in human color vision. We suggest that multiplicative internal noise modulates red-green spatial summation and chromatic contrast processing and may represent a fundamental limit in spatially disordered networks. |
Tipo: | Artigo em ata de conferência |
URI: | https://hdl.handle.net/1822/18413 |
ISBN: | 9780819485755 |
DOI: | 10.1117/12.892098 |
ISSN: | 0277-786X |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CDF - OCV - Comunicações/Communications (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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ProcSPIEMedina_AOP_2011.pdf Acesso restrito! | 1,96 MB | Adobe PDF | Ver/Abrir |