WAVELENGTH SUPPRESSION CHARACTERISTICS DURING FORCED DOMINANCE OF THE CONTRALATERAL EYE

Title WAVELENGTH SUPPRESSION CHARACTERISTICS DURING FORCED DOMINANCE OF THE CONTRALATERAL EYE
Author, Co-Author Teng Ooi, Michael Loop
Topic
Year
1992
Day
Monday
Program Number
Poster 38
Room
Great Hall
Affiliation
Abstract Conventionally, binocular rivalry is induced when the two eyes are simultaneously stimulated with different spatial patterns. In a slight variant, Wolfe showed phenomenologically that a contralaterally suppressed eye can predictably be made dominant by suddenly stimulating the contralateral eye. For simplicity, we term this paradigm 'flash suppression'. Wolfe also hypothesized that flash suppression has the same mechanism as binocular rivalry suppression. The purpose of our study was to test Wolfe's hypothesis by examining color and luminance sensitivities during flash suppression, as Smith has shown a differential effect for binocular rivalry suppression. A pair of square (5.7 deg) 2.8 cpd diagonally oriented gratings (5.9 cd/m2) [superscript m2] were used to induce the suppression states. We measured increment threshold sensitivities for 1 deg, 20 msec flashes for four subjects. Our results showed that while the blue color mechanism (439 nm on black and white gratings) was suppressed more than the luminance mechanism (540 nm on black and 540 nm gratings) in binocular rivalry, the blue mechanism was least suppressed in flash suppression. We conclude that flash suppression does not share the same mechanism with binocular rivalry suppression, at least with respect to wavelength suppression, even though they produce the same perceptual impression.
Affiliation of Co-Authors
Outline