Surface boundary contour strengthens image dominance in binocular competition.
We used a binocular rivalry stimulus with one half-image having a vertical grating disk surrounded by horizontal grating, and the other half-image having a horizontal grating disk with a variable spatial phase relative to the surrounding horizontal grating. We found that increasing the phase-shift of the horizontal grating disk, which strengthens the boundary contour, progressively increases its predominance. But the predominance is little affected when a constant gray ring (boundary contour) is added onto the rim of the incrementally phase-shifted horizontal grating. This suggests the influence of boundary contour supersede that of the center-surround-interaction caused by the phase-shift.
Xu
Jingping P
JP
Department of Psychological and Brain Sciences, University of Louisville, Louisville, KY 40292, USA.
He
Zijiang J
ZJ
Ooi
Teng Leng
TL
D000704:Analysis of Variance; D015350:Contrast Sensitivity; D023882:Dominance, Ocular / Q000502:physiology*; D006801:Humans; D009903:Optical Illusions; D010364:Pattern Recognition, Visual / Q000502:physiology*; D015348:Vision, Binocular