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Average time taken for the apparent shift forward from the plane defined by the grating edges (uncrossed disparity of 20 arcmin) to the fixation plane for sequential blocks of 10 trials. The 3-cpd grating segment was 6° wide and 2° high and presented at 50% contrast. The time to shift decreased over blocks for all four observers. Note the difference in the y-axis scale for the upper and lower graphs.
