The fusion illusion

Abstract Four experiments were performed to test for the occurrence of perceived central fusion of vertically disparate stimuli. Two of these employed the method of Signal Detection Theory in order to measure the sensitivity of observers in discriminating disparate from non-disparate cyclofusional stimuli along the horizontal meridian. The other two experiments attempted to compare “fusion” thresholds with monocular control data. The fusion effect could not be differentiated from the limitations of monocular acuity. It was concluded that fusion is an illusion which may be attributed to the effects of suppression and failures of acuity.

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