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Spatial and temporal chromatic contrast: Effects on chromatic discrimination for stimuli varying in L- and M-cone excitation

Published online by Cambridge University Press:  06 September 2006

ANDREW J. ZELE ,
VIVIANNE C. SMITH  and
JOEL POKORNY
ANDREW J. ZELE
Affiliation:
Department of Ophthalmology and Visual Science, The University of Chicago, Chicago, Illinois
VIVIANNE C. SMITH
Affiliation:
Department of Ophthalmology and Visual Science, The University of Chicago, Chicago, Illinois
JOEL POKORNY
Affiliation:
Department of Ophthalmology and Visual Science, The University of Chicago, Chicago, Illinois
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Abstract

Discrimination for equiluminant chromatic stimuli that vary in L- and M-cone excitation depends on the chromaticity difference between the test field and the surrounding area. The current study investigated the effect of the proximity in space and time of a surround to the test field on chromatic contrast discrimination. The experimental paradigm isolated spatial, temporal, and spatial-and-temporal chromatic contrast effects on discrimination. Chromatic contrast discrimination thresholds were assessed by a four-alternative spatial forced-choice procedure. Stimuli were either metameric to the equal energy spectrum, or varied in L-cone activation along a line of constant S-cone activation. A model based on primate parvocellular pathway physiology described the data. Spatial and temporal contrast produced equivalent reductions in chromatic discriminability as the chromatic difference between the test and surround increased. For all test chromaticities, discrimination was best in the absence of chromatic contrast. Chromatic contrast discrimination is determined by either the spatial or temporal contrast component of the signal.

Keywords

Parvocellularchromatic contrast discriminationspatial contrasttemporal contrast
Type
TEMPORAL FACTORS
Information
Visual Neuroscience , Volume 23 , Issue 3-4 , May 2006 , pp. 495 - 501
Copyright
© 2006 Cambridge University Press

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References

REFERENCES

Boynton, R.M., Hayhoe, M.M., & Macleod, D.I.A. (1977). The gap effect: chromatic and achromatic visual discrimination as affected by field separation. Optica Acta 24, 159–177.Google Scholar
Boynton, R.M. & Kambe, N. (1980). Chromatic difference steps of moderate size measured along theoretically critical axes. Color Research and Application 5, 13–23.Google Scholar
Brown, W.R.J. (1952). The effect of field size and chromatic surroundings on color discrimination. Journal of the Optical Society of America 42, 837–844.Google Scholar
Hood, D.C. & Finkelstein, M.A. (1986). Sensitivity to Light. In Handbook of Perception and Human Performance, Vol I: Sensory Processes and Perception, eds. Boff, K.R., Kaufman, L. & Thomas, J.P., pp. 5/1–5/66. John Wiley & Sons, New York.
Krauskopf, J. & Gegenfurtner, K. (1991). Adaptation and color discrimination. In From Pigments to Perception, eds. Valberg, A. & Lee, B.B., pp. 379–389. London: Plenum Press.
Krauskopf, J. & Gegenfurtner, K. (1992). Color discrimination and adaptation. Vision Research 32, 2165–2175.Google Scholar
Lee, B.B., Pokorny, J., Smith, V.C., & Kremers, J. (1994). Responses to pulses and sinusoids in macaque ganglion cells. Vision Research 34, 3081–3096.Google Scholar
Lee, B.B., Pokorny, J., Smith, V.C., Martin, P.R., & Valberg, A. (1990). Luminance and chromatic modulation sensitivity of macaque ganglion cells and human observers. Journal of the Optical Society of America A 7, 2223–2236.Google Scholar
Loomis, J.M. & Berger, T. (1979). Effects of chromatic adaptation on color discrimination and color appearance. Vision Research 19, 891–901.Google Scholar
Miyahara, E., Pokorny, J., & Smith, V.C. (1996). Increment threshold and purity discrimination spectral sensitivities of X-chromosome-linked color defective observers. Vision Research 36, 1597–1613.Google Scholar
Miyahara, E., Smith, V.C., & Pokorny, J. (1993). How surrounds affect chromaticity discrimination. Journal of the Optical Society of America A 10, 545–553.Google Scholar
Pointer, M.R. (1974). Color discrimination as a function of observer adaptation. Journal of the Optical Society of America 64, 750–759.Google Scholar
Pokorny, J. & Smith, V.C. (1997). Psychophysical signatures associated with magnocellular and parvocellular pathway contrast gain. Journal of the Optical Society of America A 14, 2477–2486.Google Scholar
Purpura, K., Tranchina, D., Kaplan, E., & Shapley, R.M. (1990). Light adaptation in the primate retina: Analysis of changes in gain and dynamics of monkey retinal ganglion cells. Visual Neuroscience 4, 75–93.Google Scholar
Shapiro, A. & Zaidi, Q. (1992). The effects of prolonged temporal modulation on the differential response of color mechanisms. Vision Research 32, 2065–2075.Google Scholar
Shapley, R. (1990). Visual sensitivity and parallel retinocortical channels. Annual Review of Psychology 41, 635–658.Google Scholar
Smith, V.C., Lee, B.B., Pokorny, J., Martin, P.R., & Valberg, A. (1992). Responses of macaque ganglion cells to the relative phase of heterochromatically modulated lights. Journal of Physiology 458, 91–221.Google Scholar
Smith, V.C. & Pokorny, J. (1975). Spectral sensitivity of the foveal cone photopigments between 400 and 500 nm. Vision Research 15, 161–171.Google Scholar
Smith, V.C. & Pokorny, J. (2003). Psychophysical correlates of Parvo- and Magnocellular function. In Normal and Defective Colour Vision, eds. Mollon, J., Pokorny, J. & Knoblauch, K., pp. 91–107. Oxford University Press.
Smith, V.C., Pokorny, J., Lee, B.B., & Dacey, D.M. (2001). Primate horizontal cell dynamics: An analysis of sensitivity regulation in the outer retina. Journal of Neurophysiology 85, 545–558.Google Scholar
Smith, V.C., Pokorny, J., & Sun, H. (2000). Chromatic contrast discrimination: Data and prediction for stimuli varying in L and M cone excitation. Color Research and Application 25, 105–115.Google Scholar
Swanson, W.H., Ueno, T., Smith, V.C., & Pokorny, J. (1987). Temporal modulation sensitivity and pulse detection thresholds for chromatic and luminance perturbations. Journal of the Optical Society of America A 4, 1992–2005.Google Scholar
Watanabe, A., Pokorny, J., & Smith, V.C. (1998). Red-green chromatic discrimination with variegated and homogeneous stimuli. Vision Research 38, 3271–3274.Google Scholar
Yeh, T., Lee, B.B., & Kremers, J. (1996). The time course of adaptation in macaque retinal ganglion cells. Vision Research 36, 913–931.Google Scholar
Zele, A.J. & Vingrys, A.J. (2005). Cathode-ray-tube monitor artefacts in neurophysiology. Journal of Neuroscience Methods 141, 1–7.Google Scholar