Binocular fusion characteristics in the central part of the fovea
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In psychophysical experiments, the horizontal and vertical limits of binocular fusion were measured as a function of the eccentricity in the foveal region with the use of three-dot stimuli organized in right-angle patterns. The results showed a monotonous linear growth of the horizontal and vertical fusion limits. The slope ratio was approximately 2 : 1 and the intercept ratio about 1.4. The data are similar to the results of previous studies (Loginovich et al, 2004 Perception 33 Supplement, 90). The linear functions obtained were used to evaluate the extent of Panum's area in the centre of the fovea. It was approximately 10 min of arc and 7 min of arc for horizontal and vertical dimensions, respectively. Our findings are consistent with the data on the human cortical magnification factor (Grüsser, 1995 Vision Research 35 1125 - 1134) and with the assumption that the Panum area is scaled by the size of the foveal hypercolumns (Yeshurun and Schwartz, 1999 Biological Cybernetics 80 117 - 129).