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.
Eskew
R T
RT
Division of Applied Sciences, Harvard University, Cambridge, MA 02138.
Stromeyer
C F
CF
Kronauer
R E
RE
D003118:Color Perception / Q000502:physiology*; D006801:Humans; D008297:Male; D010470:Perceptual Masking / Q000502:physiology; D011594:Psychometrics; D012684:Sensory Thresholds / Q000502:physiology; D013997:Time Factors