The magnitude and dynamics of interocular suppression affected by monocular boundary contour and conflicting local features.
A monocular boundary contour (MBC) rivalry stimulus has two half-images, a homogeneous grating and the same homogeneous grating with an additional disc region. The outline/frame of the MBC disc is created by relative phase-shift, or orientation-difference. We found the increment contrast threshold and reaction time to detect a monocular Gabor probe elevated on the homogeneous half-image pedestal. The interocular suppression begins as early as 80ms upon stimulus onset. Moreover, the suppression magnitude is larger when the MBC disc is defined by orientation-difference rather than phase-shift, revealing the suppression caused by competing local features in addition to MBC.
Su
Yong R
YR
Department of Basic Sciences, Pennsylvania College of Optometry at Salus University, Elkins Park, PA 19027, USA.
He
Zijiang J
ZJ
Ooi
Teng Leng
TL
D015350:Contrast Sensitivity / Q000502:physiology; D023882:Dominance, Ocular / Q000502:physiology; D006801:Humans; D010775:Photic Stimulation; D011930:Reaction Time; D012684:Sensory Thresholds; D015348:Vision, Binocular / Q000502:physiology*; D015349:Vision, Monocular / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology