Abstract
Objective measurement of human cyclofusional response was carried out, using a binocular recording technique. Decreasing stimulus size was found to result in an increased cyclofusional range. The results suggest that in the case of torsionally disparate retinal-images it is not the angle of displacement between the two images of the stimulus but the disparity introduced by the stimulus that the fusional mechanism primarily responds to. The implications of this result on disparity detection within Panum's fusional areas is discussed in the light of recent neurophysiological and psychophysical evidence.
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