Abstract
Horizontal and vertical disparity limits of binocular fusion were examined with temporal or with spatio-temporal modulation of binocular disparity for two lines at 0.5 deg retinal eccentricity. For both horizontal and vertical disparity, Panum's fusional areas became extended by low spatial frequency variation in disparity. The horizontal extent of Panum's area also varied with temporal frequency of disparity variation. Under low spatial frequency conditions, Panum's area increased horizontally by as much as a factor of 10 (but vertically by less than a factor of 2) when temporal frequency decreased from 5.0 Hz to 0.1 Hz. At high spatial frequencies the horizontal and vertical extents of Panum's area remained almost constant (within a factor of 1.5) over the entire range of temporal frequencies. These results illustrated that Panum's area is the combination of a constant minimum area with an extended area that responds to low frequency time-varying disparities.
Published Version
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