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Para Kang, Steven Shevell; Representation of location during misbinding of color. Journal of Vision 2007;7(9):365. doi: 10.1167/7.9.365.
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© ARVO (1962-2015); The Authors (2016-present)
PURPOSE Perceptual misbinding of color during binocular rivalry reveals separate neural representations of color and form followed by a neural binding process (Hong & Shevell, Visual Neuroscience, 2006). During misbinding of color, the neural representation of color from a suppressed form is expressed within a region of the dominant form. The study here examined how color is misbound to a non-retinotopic location and considered how the neural representation of location relates to perceptual binding of color to form.
METHOD A 2 cpd square-wave vertical grating was presented to one eye and a tooth-shaped vertically oriented grating (top half of grating phase-shifted right by one-half cycle relative to bottom half) to the other eye for 90 seconds. A grating with luminance-contrast (e.g. a red/black grating) was presented to one eye, and an isoluminant grating (e.g. a green/white grating) to the other eye. The exclusive visibility time was measured for the percept of each eye's stimulus alone (dominance) and for a two-color vertical or tooth-shaped grating (e.g. a perceived red/green grating). The two different forms (vertical vs tooth-shaped) distinguished whether misbinding was perceived in the form with luminance contrast or the form at isoluminance.
RESULTS With luminance contrast of 75% or more, misbinding of color was perceived frequently within the isoluminant form but very rarely within the luminance-contrast form.
CONCLUSION The results indicate misbinding occurs within the form with a weak neural representation of location. Misbinding of a chromatic signal from the suppressed luminance-contrast form shows that location information provided by luminance-contrast edges does not inhibit binding the color to a non-retinotopic region within the dominant isoluminant form. Suppression of form may also suppress the neural representation of location but an open question is whether form and location are represented separately.
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