Simple reaction times in color space: the influence of chromaticity, contrast, and cone opponency.

PURPOSE This study examined the influence of stimulus chromaticity on simple reaction times (RTs) to determine the stage of chromatic processing that is most influential in their generation. METHODS Simple RTs were measured in response to the cosinusoidally ramped onset of small, equiluminant, colored Gaussian spots. The chromaticity of these stimuli was varied, to modulate along a series of vectors in color space that included red-green (L-M) and blue-yellow (S-[L+M]) opponent axes. RESULTS RTs are highly sensitive to small departures from subjective equiluminance. They are also dependent on stimulus chromaticity. The longest RTs are generated in response to equiluminant stimuli that isolate S-cone activity, whereas the shortest are generated by stimuli that modulate the L-M opponent axis. However, temporal processing differences are highly dependent on how the chromatic stimuli are scaled in relation to one another. The differences are reduced when scaling is based on detection threshold. The relationship between chromatic contrast and RT can be described by the modified Piéron equation RT = RT(0) + k x C(-1). CONCLUSIONS Simple RTs generated in this study conform to the idea that they are largely determined by cone-opponency mechanisms. The use of cone contrast as a metric for scaling chromatic stimuli exaggerates differences between the temporal responsiveness of L-M and S-(L+M) opponency mechanisms.

[1]  E. Callaway,et al.  S Cone Contributions to the Magnocellular Visual Pathway in Macaque Monkey , 2002, Neuron.

[2]  K. Mullen,et al.  Evidence for the stochastic independence of the blue-yellow, red-green and luminance detection mechanisms revealed by subthreshold summation , 1999, Vision Research.

[3]  Vivianne C. Smith,et al.  Reaction times to chromatic stimuli , 1985, Vision Research.

[4]  W. McIlhagga,et al.  Detection mechanisms in L-, M-, and S-cone contrast space. , 1993, Journal of the Optical Society of America. A, Optics and image science.

[5]  Rhea T Eskew,et al.  ON and OFF S-cone pathways have different long-wave cone inputs , 2000, Vision Research.

[6]  A. Lit,et al.  Simple reaction time as a function of luminance for various wavelengths , 1971 .

[7]  K. Mullen,et al.  Estimation of the L-, M-, and S-cone weights of the postreceptoral detection mechanisms , 1996 .

[8]  R. Shapley,et al.  The primate retina contains two types of ganglion cells, with high and low contrast sensitivity. , 1986, Proceedings of the National Academy of Sciences of the United States of America.

[9]  S. Schwartz.  Spectral sensitivity as revealed by isolated step onsets and step offsets. , 1996, Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians.

[10]  R. Harwerth,et al.  Red-Green Cone Interactions in the Increment-Threshold Spectral Sensitivity of Primates , 1971, Science.

[11]  J. Kulikowski,et al.  Red–green and blue–yellow mechanisms are matched in sensitivity for temporal and spatial modulation , 2001, Vision Research.

[12]  R. L. Valois,et al.  Some transformations of color information from lateral geniculate nucleus to striate cortex. , 2000, Proceedings of the National Academy of Sciences of the United States of America.

[13]  A. Goodchild,et al.  Segregation of receptive field properties in the lateral geniculate nucleus of a New-World monkey, the marmoset Callithrix jacchus. , 1998, Journal of neurophysiology.

[14]  Paul R. Martin,et al.  Colour processing in the primate retina: recent progress , 1998, The Journal of physiology.

[15]  J. Pokorny,et al.  Spectral sensitivity of the foveal cone photopigments between 400 and 500 nm , 1975, Vision Research.

[16]  Angela M. Brown,et al.  Higher order color mechanisms , 1986, Vision Research.

[17]  R. Shapley,et al.  Parallel retinocortical channels and luminance , 1999 .

[18]  D. W. Heeley,et al.  Cardinal directions of color space , 1982, Vision Research.

[19]  M. Webster,et al.  The influence of contrast adaptation on color appearance , 1994, Vision Research.

[20]  F. Mechler,et al.  Temporal coding of contrast in primary visual cortex: when, what, and why. , 2001, Journal of neurophysiology.

[21]  A. Lit,et al.  Simple time reaction as a function of luminance for various wavelengths , 1971 .

[22]  Joseph L. Holmes.  Reaction Time to Photometrically Equal Chromatic Stimuli , 1926 .

[23]  P. King-Smith,et al.  Luminance and opponent-color contributions to visual detection and adaptation and to temporal and spatial integration. , 1976, Journal of the Optical Society of America.

[24]  Carol L. Colby,et al.  The responses of single cells in the lateral geniculate nucleus of the rhesus monkey to color and luminance contrast , 1983, Vision Research.

[25]  H. Piéron.  I. La sensation chromatique. Données sur la latence propre et l'établissement des sensations de couleur , 1931 .

[26]  B. B. Lee,et al.  Amplitude and phase of responses of macaque retinal ganglion cells to flickering stimuli. , 1989, The Journal of physiology.

[27]  P. Lennie,et al.  Chromatic mechanisms in striate cortex of macaque , 1990, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[28]  J. Krauskopf,et al.  Reaction time as a measure of the temporal response properties of individua colour mechanisms. , 1973, Vision research.

[29]  I. J Murray,et al.  Neurophysiological interpretation of human visual reaction times: effect of contrast, spatial frequency and luminance , 2000, Neuropsychologia.

[30]  Joel Pokorny,et al.  Wavelength effects on simple reaction time , 1977 .

[31]  B. B. Lee,et al.  The physiological basis of the minimally distinct border demonstrated in the ganglion cells of the macaque retina. , 1990, The Journal of physiology.

[32]  Barry B. Lee,et al.  The 'blue-on' opponent pathway in primate retina originates from a distinct bistratified ganglion cell type , 1994, Nature.

[33]  R. L. Valois,et al.  Temporal dynamics of chromatic tuning in macaque primary visual cortex , 1998, Nature.

[34]  E. Switkes,et al.  Comparison of color and luminance contrast: apples versus oranges? , 1999, Vision Research.

[35]  D. Macleod,et al.  Faster than the eye can see: blue cones respond to rapid flicker. , 1993, Journal of the Optical Society of America. A, Optics and image science.

[36]  M. S. Loop,et al.  Differences in temporal appearance associated with activity in the chromatic and achromatic systems , 1983, Perception & psychophysics.

[37]  R. M. Boynton,et al.  Chromaticity diagram showing cone excitation by stimuli of equal luminance. , 1979, Journal of the Optical Society of America.

[38]  K T Mullen,et al.  Bipolar or rectified chromatic detection mechanisms? , 2001, Visual Neuroscience.

[39]  J. Pokorny,et al.  Effect of sawtooth polarity on chromatic and luminance detection , 1994, Visual Neuroscience.

[40]  J. Krauskopf,et al.  Cone Contrast and Opponent Modulation Color Spaces 565 ( a ) , 2022 .

[41]  P. Lennie,et al.  Chromatic mechanisms in lateral geniculate nucleus of macaque. , 1984, The Journal of physiology.

[42]  R. Reid,et al.  The koniocellular pathway in primate vision. , 2000, Annual review of neuroscience.

[43]  C. F. Stromeyer,et al.  Colour is what the eye sees best , 1993, Nature.

[44]  N. Parry.  Contrast dependence of reaction times to chromatic gratings , 2001 .

[45]  A. Vassilev,et al.  Spatial summation of blue-on-yellow light increments and decrements in human vision , 2000, Vision Research.

[46]  J. D. Pollack,et al.  Reaction time to different wavelengths at various luminances , 1968 .

[47]  R. L. Valois,et al.  Hue Scaling of Isoluminant and Cone-specific Lights , 1997, Vision Research.

[48]  R. Shapley,et al.  The spatial transformation of color in the primary visual cortex of the macaque monkey , 2001, Nature Neuroscience.

[49]  G. C. Duncan,et al.  Contribution of the retinal ON channels to scotopic and photopic spectral sensitivity , 1989, Visual Neuroscience.