Saccadic suppression during monocular visual stimulation J Knöll, P Holl, F Bremmer |
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Department of Neurophysics, Philipps-University Marburg, Germany
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| Saccadic suppression describes the reduction of luminance contrast sensitivity at low spatial frequencies around the time of saccades. Its origin is yet unclear as is the question whether it is based on binocular or monocular neural processing. In the latter case, contrast sensititivty should not depend on the movement of the non-stimulated eye during monocular stimulation. Contrast sensitivty was measured psychophysically in a 2AFC task. Human observers performed saccades in depth to targets aligned in front of one of the two eyes. This resulted in temporally aligned saccades of different size and velocity for the two eyes. Participants indicated the perceived location of a low spatial frequency stimulus with variable luminance that was presented monocularly to either eye above or below the horizontal meridian. When analyzed with respect to the eyes’ individual velocity, the contrast sensitivity for a given velocity differed between the faster and the slower eye. When analysis was based on the velocity of the faster eye, contrast-sensitivity functions were comparable for stimulation of either eye. We conclude that saccadic suppression does not depend on the speed of the stimulated eye but rather on the ocuolomotor control of both eyes. Support: Deutsche Forschungsgemeinschaft (GRK-885, FOR-560) and EU MEMORY |
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