It was assumed that there is a variable, named “strength of fusion,” underlying binocular fusion and rivalry. The strength of fusion is the resistance of the fused left- and right-eye patterns to separation. The first task was to obtain a measure of the strength of fusion and the second to examine the strength of fusion as a function of various differences of the patterns. The experiments showed that the angular separation only in the temporalward direction could be used as an appropriate measure of the strength of fusion and its value was maximum when the patterns were identical and decreased as the difference increased. This result supports the assumption about the strength of fusion.
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