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The time-course of chromatic facilitation by luminance contours
R T Eskew1, C F Stromeyer, R E Kronauer
1Division of Applied Sciences, Harvard University, Cambridge, MA 02138.
Vision Research
|December 1, 1994
Abstract:
The threshold for detecting an equiluminant chromatic spot is approximately halved by the presentation of a coincident, suprathreshold luminance pedestal flash. The dynamics of this facilitation were studied by varying the duration and temporal asynchrony of the chromatic test flash and luminance pedestal. Facilitation occurs in a narrow temporal window near the chromatic test presentation; masking may occur when the pedestal is temporally displaced from the test by longer times. The mechanism producing facilitation lags behind the chromatic signal by at least 20 msec.