Oct 28, 2008

Nonlinear SSVEP responses are sensitive to the perceptual binding of visual hemifields during conventional 'eye' rivalry and interocular 'percept' rivalry

Brain Research
David Sutoyo, Ramesh Srinivasan


We conducted behavioral and EEG experiments to identify physiological correlates of perceptual binding during two types of binocular rivalry: (1) conventional 'eye' rivalry where perception alternates between the two monocular images presented one to each eye and (2) interocular 'percept' rivalry, where perception alternates between percepts formed by grouping complementary hemifields one from each eye. We employed 'frequency-tagging' by flickering a grating in each hemifield of each eye at different frequencies to elicit SSVEP responses specific to each hemifield of each eye. When the gratings in complementary visual fields of the two eyes were congruent in color and orientation, robust interocular 'percept' rivalry was observed with roughly equal probability to conventional 'eye' rivalry. The SSVEPs evoked by the flickering gratings were enhanced by conscious perception at both posterior and frontal electrodes only during conventional 'eye' rivalry and not during interocular 'percept' rivalry, suggesting that dominance of one eye is the basis of most previous reports of SSVEP modulation by conscious perception. We also observed nonlinear SSVEP responses at the sums of our four fundamental frequencies. These combination respon...Continue Reading

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