Combining cues in contour orientation discrimination.
The perceived orientation of a Gabor-patch contour is determined, in part, by shifts in carrier phase between the patches [Popple, A. V. & Sagi, D., 2000. A Fraser illusion without local cues? Vision Research, 40, 873-878; Popple, A. V. & Levi, D. M., 2000a. A new illusion demonstrates long-range processing. Vision Research, 40, 2545-2549; Popple, A. V. & Levi, D. M., 2000b. Amblyopes see true alignment where normal observers see illusory tilt. Proceedings of the National Academy of Sciences of the United States of America, 97, 11667-11672]. Here we show that perceived orientation results from the combination of at least three stimulus cues: (1) patch orientation, (2) contour envelope orientation, and (3) between-patches orientation, which is a function of phase-shifts. In a series of three experiments, we investigated how these three cues were combined. The data are consistent with weighted cue combination.
School of Optometry, Minor Hall, University of California at Berkeley, Berkeley, CA 94720-2020, USA. ariellap@berkeley.edu
Ariella V
AV
Popple
Dennis M
DM
Levi
D001499:Bayes Theorem; D003463:Cues; D004192:Discrimination, Psychological; D006801:Humans; D008960:Models, Psychological; D009903:Optical Illusions; D009949:Orientation; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics