The time-course of chromatic facilitation by luminance contours.
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.
Division of Applied Sciences, Harvard University, Cambridge, MA 02138.
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Eskew
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Stromeyer
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Kronauer
D003118:Color Perception / Q000502:physiology*; D006801:Humans; D008297:Male; D010470:Perceptual Masking / Q000502:physiology; D011594:Psychometrics; D012684:Sensory Thresholds / Q000502:physiology; D013997:Time Factors