Tel. (773) 702-8842 (office)   
(773) 702-9412 (lab)   
Fax (773) 702-0939   
Email shevell@uchicago.edu   
Visual Science Laboratories   
University of Chicago   
940 East 57th Street   
Chicago, IL 60637   

Steve

Steve Shevell...

Linda

Linda Glennie...

Sammy

Sang Wook Hong...
Perceptual Mis-binding of Color and Form: The idea of separate processing of color and form, which is closely related to the ‘binding problem’ in perception, is challenged by recent physiological studies showing multiple selectivity in single cells in early visual cortex. Psychophysical studies, by use of binocular rivalry phenomenon, show that color and form are processed in separate manner, although single cells are tuned to a specific color and a specific orientation. When two purely chromatic equiluminant gratings are presented in phase haploscopically, a new percept is observed in which both chromaticities are perceived but in out-of-phase stripes, which may be an example of ‘perceptual mis-binding’ of color and form. This supports the hypothesis of separate processing of color and form and the necessity of binding.
S-cone Antagonistic Center-Surround Receptive Field: No known retinal mechanism clearly accounts for the chromatic induction from patterned backgrounds defined by difference in S-cone stimulation. Recent physiological studies find out cortical cells with S-cone antagonistic center-surround receptive field. Psychophysical experiments and mathematical models reveal that an S-cone antagonistic center-surround receptive field can explain changes in color appearance caused by surrounding light differed in S-cone stimulation.

Suzanne

Suzanne Belmore...
Adaptation is a key regulatory mechanism for altering the neural response properties to a stimulus. My research measures the effect of very long-term adaptation on the neural processes that mediate color perception. The primary goal of the proposed measurements is to determine if receptoral gain changes underlie the adaptation mechanism. In order to adapt the visual system, human subjects are exposed to lights of selective wavelengths for a few hours per day over a few weeks.

Anthony

Anthony D'Antona...
The neural representation of an object depends not only on the light reflected from itself but also on the light reflecting from its surroundings. This is called induction. The same physical object can change its appearance when placed within different backgrounds. My research focuses on the temporal properties of brightness and color induction, particularly whether it is mediated by linear or nonlinear processes.

Recent Alumni


Florent
Florent Autrusseau
Sherry
Sherry X. Xian
Patrick
Patrick Monnier
Ding
Dingcai Cao
Not pictured: Joongnam Yang, Claire Barnes, Elaine W. Jin, Jichang He, and Jianpin Wei.