Brief presentations reveal the temporal dynamics of brightness induction and White's illusion.
We measured the timecourse of brightness processing by briefly presenting brightness illusions and then masking them. Brightness induction (brightness contrast) was visible when presented for only 58 ms, was stronger at short presentation times, and its visibility did not depend on spatial frequency. We also found that White's illusion was visible at 82 ms. Together, these results suggest that (1) brightness perception depends on the surrounding context, even at very short presentation times, (2) the initial brightness percept is generated very quickly, but additional exposure can modulate it, and (3) the temporal dynamics are not dependent on a slow filling-in process.
Robinson
Alan E
AE
Department of Cognitive Science, University of California, 9500 Gilman Drive, San Diego, La Jolla, CA, USA. robinson@cogsci.ucsd.edu
de Sa
Virginia R
VR
D015350:Contrast Sensitivity / Q000502:physiology; D006801:Humans; D008029:Lighting; D008297:Male; D009903:Optical Illusions / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010470:Perceptual Masking / Q000502:physiology; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics; D013997:Time Factors