Perceptual Neuroscience Laboratory

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Publications listed by Category


Publications organized by Year


Color Perception


Color and Brightness Induction


  1. Zaidi, Q. Color and brightness induction: from Mach bonds to three-dimensional configurations. In Color Vision: From Genes to Perception. Cambridge University Press, New York, 1999
  2. De Bonet, J. S. and Zaidi, Q. Comparison between spatial interactions in perceived contrast and perceived brightness. Vision Research, 37 (9): 1141-55, 1997
  3. Zaidi, Q.; Spehar, B. and Shy, M. Induced effects of backgrounds and foregrounds in three-dimensional configurations: the role of T-junctions. Perception, 1997
  4. Spehar, B. and Zaidi, Q. Surround effects on the shape of the temporal contrast-sensitivity function. Journal of the Optical Society of America. A, Optics, image science, and vision, 14 (9): 2517-25, 1997
  5. Spehar, B.; Debonet, J. S. and Zaidi, Q. Brightness induction from uniform and complex surrounds: a general model. Vision Research, 36 (13): 1893-906, 1996
  6. Zaidi, Q. and Zipser, N. Induced contrast from radial patterns. Vision Research, 33: 1281-1286, 1993
  7. Zaidi, Q.; Yoshimi, B.; Flanigan, N. and Canova, A. Lateral interactions with color mechansim in simultaneous induced contrast. Vision Research, 32: 1695-1707, 1992
  8. Zaidi, Q.; Yoshimi, B. and Flannigan, J. Influence of shape and perimeter length on induced color contrast. Journal of the Optical Society of America. A, Optics and image science, 8 (11): 1810-7, 1991
  9. Zaidi, Q. Apparent brightness in complex displays: A reply to Moulden and kingdom. Vision Research, 30: 1253-1255, 1990
  10. Zaidi, Q. Local and distal factors in visual grating induction. Vision Research, 29: 691-697, 1989
  11. Krauskopf, J. and Zaidi, Q. Induced Desensitization. Vision Research, 26 (5): 759-762, 1986
  12. Krauskopf, J.; Zaidi, Q. and Mandler, M. B. Mechanisms of simultaneous color induction. Journal of the Optical Society of America. A, Optics and image science, 3 (10): 1752-7, 1986

Constancy, Transparency, Scission


  1. Zaidi, Q. and Bostic, M. Color strategies for object identification. Vision Research, 48 (26): 2673-81, 2008
  2. Robilotto, R. and Zaidi, Q. Lightness identification of patterned three-dimensional real objects. Journal of Vision, 6 (1): 18-36, 2006
  3. Zaidi, Q. Fitting the Mind to the World: Adaptation and Aftereffects in High-Level Vision, Advances in Visual Cognition Series.
  4. Khang, B-g. and Zaidi, Q. Illuminant color perception of spectrally filtered spotlights. Journal of Vision, Special issue on Perception of Color and Material Properties in Complex Scenes, 4 (9): 680-692, 2004
  5. Robilotto, R. and Zaidi, Q. Limits of lightness identification for real objects under natural viewing conditions. Journal of Vision, Special issue on Perception of Color and Material Properties in Complex Scenes, 4 (9): 779-797, 2004
  6. Smithson, H. and Zaidi, Q. Colour constancy in context : Roles for local adaptation and levels of reference. Journal of Vision, Special issue on Perception of Color and Material Properties in Complex Scenes, 4 (9): 693-710, 2004
  7. Robilotto, R. and Zaidi, Q. Perceived transparency of neutral density filters across dissimilar backgrounds. Journal of Vision, 4 (3): 183-195, 2004
  8. Khang, B-G. and Zaidi, Q. Cues and strategies for color constancy: perceptual scission, image junctions and transformational color matching. Vision Research, 42 (2): 211-26, 2002
  9. Khang, B-G. and Zaidi, Q. Accuracy of color scission for spectral transparencies. Journal of Vision, 2: 451-466, 2002
  10. Robilotto, R.; Khang, B-G. and Zaidi, Q. Sensory and physical determinants of perceived achromatic transparency. Journal of Vision, 2 (5): 388-403, 2002
  11. Joost, U.; Lee, B. B and Zaidi, Q. Commentary on "Lichtenberg, G.C.( 1793) Letter to Johann Wolfgang von Goethe on “Farbige Schatten.". Color Research and Application, 27: 300-303, 2001
  12. Zaidi, Q. Color Constancy in a rough world. Color Research and Application, 26 (July): S192-S200, 1999
  13. Zaidi, Q. Identification of illuminant and object colors: heuristic-based algorithms. Journal of the Optical Society of America. A, Optics, image science, and vision, 15 (7): 1767-76, 1998
  14. Zaidi, Q.; Spehar, B. and Debonet, J. Color constancy in variegated scenes : role of low-level mechanisms in discounting illumination changes. Journal of Opt Soc Am A, 14 (10): 2608-2621, 1997

Clinical Studies


  1. Greenstein, V. C.; Zaidi, Q.; Hood, D. C.; Spehar, B.; Cideciyan, A. V. and Jacobson, S. G. The enhanced S cone syndrome: an analysis of receptoral and post-receptoral changes. Vision Research, 36 (22): 3711-22, 1996
  2. Greenstein, V. C.; Halevy, D.; Zaidi, Q.; Koenig, K. L. and Ritch, R. H. Chromatic and luminance systems deficits in glaucoma. Vision Research, 36 (4): 621-9, 1996
  3. Greenstein, V. C.; Shapiro, A.; Hood, D. C. and Zaidi, Q. Chromatic and luminance sensitivity in diabetes and glaucoma. Journal of the Optical Society of America. A, Optics, image science, and vision, 10 (8): 1785-91, 1993
  4. Greenstein, V. C.; Shapiro, A.; Zaidi, Q. and Hood, D. C. Psychophysical evidence for post-receptoral sensitivity loss in diabetics. Investigative Ophthalmology & Visual Science, 33 (10): 2781-90, 1992
  5. Zaidi, Q.; Pokorny, J. and Smith, V. Sources of individual differences in anomaloscope equations for tritan defects. Clinical Vision Science, 4: 89-94, 1989

Cortical Color Representation


  1. Zaidi, Q. and Li, A. Three-dimensional shape perception from chromatic orientation flows. Visual Neuroscience, 23 (3-4): 323-30, 2006
  2. Clifford, C. W. G.; Spehar, B.; Solomon, S. G.; Martin, P. R. and Zaidi, Q. Interactions between color and luminance in the perception of orientation. Journal of Vision, 3 (2): 106-15, 2003
  3. Zaidi, Q. Is There a Perceptual Color Space? Review of "Geometric representations of perceptual phenomena”. Color Research & Application: 325-328, 2001
  4. Zaidi, Q. and Halevy, D. Visual Mechanisms that signal the direction of color changes. Vision Research, 33 (8): 1037-1051, 1993
  5. Zaidi, Q. and Shapiro, A. G. Adaptive orthogonalization of opponent-color signals. Biological Cybernetics, 69 (5-6): 415-28, 1993
  6. Sachtler, W. L. and Zaidi, Q. Chromatic and luminance signals in visual memory. Journal of the Optical Society of America. A, Optics and image science, 9 (6): 877-94, 1992
  7. Zaidi, Q. and Halevy, D. Chromatic mechanisms beyond linear opponency. In From Pigments to Perception: Advances in Understanding Visual Processes Plenum Press, London, 1991

Color Adaptation


  1. Zaidi, Q.; Ennis, R.; Cao, D. and Lee, B. Neural locus of color afterimages. Current Biology : CB, 22 (3): 220-4, 2012
  2. Shapiro, A. G.; Beere, J. L. and Zaidi, Q. Time-course of S-cone system adaptation to simple and complex fields. Vision Research, 43 (10): 1135-1147, 2003
  3. Shapiro, A. G.; Beere, J. L. and Zaidi, Q. Time course of adaptation along the RG cardinal axis. Color Research & Application, 26 (S1): S43-S47, 2001
  4. Zaidi, Q.; Spehar, B. and DeBonet, J. Adaptation to textured chromatic fields. Journal of the Optical Society of America. A, Optics, image science, and vision, 15 (1): 23-32, 1998
  5. Zaidi, Q.; Shapiro, A. and Hood, D. The effect of adaption on the differential sensitivity of the s-cone color system. Vision Research, 32: 1297-1318, 1992
  6. Shapiro, A. G. and Zaidi, Q. The effects of prolonged temporal modulation on the differential response of color mechanisms. Vision Research, 32 (11): 2065-75, 1992
  7. Zaidi, Q. Adaptation and Color Matching. Vision Research, 26 (3): 1925-1938, 1986

Color Physiology and Mechanisms


  1. Ennis, R.; Lee, B. and Zaidi, Q The role of eye-movements on temporal sensitivity to targets set in surrounds: a combined physiological and psychophysical study (Submitted), 2012
  2. Zaidi, Q.; Ennis, R.; Cao, D. and Lee, B. Neural locus of color afterimages. Current Biology : CB, 22 (3): 220-4, 2012
  3. Lee, R J; Mollon, J D; Zaidi, Q and Smithson, H E Latency characteristics of the short-wavelength-sensitive cones and their associated pathways. Journal of Vision, 9 (12): 1-17, 2009
  4. Sun, H.; Smithson, H. E.; Zaidi, Q. and Lee, B. B. Do magnocellular and parvocellular ganglion cells avoid short-wavelength cone input?. Visual Neuroscience, 23 (3-4): 441-6, 2006
  5. Sun, H.; Smithson, H. E.; Zaidi, Q. and Lee, B. B. Specificity of cone inputs to macaque retinal ganglion cells. Journal of Neurophysiology, 95 (2): 837-49, 2006
  6. Griffiths, A. F. and Zaidi, Q. Rigid objects that appear to bend. Perception, 27: 799-802, 1998
  7. Zaidi, Q. Decorrelation of L- and M-cone signals. Journal of the Optical Society of America. A, Optics, image science, and vision, 14 (12): 3430-1, 1997
  8. Zaidi, Q. Commentary on "Schrodinger, E. (1925) Uber der Verhaltnis der Vierfarben zur Dreifarbentheorie". Color Research and Application, 1994
  9. Zaidi, Q. Commentary on "Maxwell, J. C. (1860) On the theory of compound colours and the relations of the colours of the spectrum". Color Research and Application,, 18: 270-272, 1993
  10. Zaidi, Q Parallel and serial connections between human color mechanisms. In Applications of Parallel Processing in Vision. Elsevier, Amsterdam, 1992
  11. Zaidi, Q. and Pokorny, J. Appearance of pulsed infrared light: second harmonic generation in the eye. Applied Optics, 27 (6): 1064-8, 1988
  12. Smith, V.; Pokorny, J. and Zaidi, Q. How do sets of color-matching functions differ? In Colour Vision: Physiology and Psychophysics. Academic Press Ltd, London, 1983
  13. Pokorny, J.; Smith, V.; S., B.; Elsner, A. and Zaidi, Q. Modeling Blue-Yellow Opponency. In Proceedings of the Fourth International Congress, AIC. , Berlin, 1981