The apparent size of a circle was measured after it was fixated by 2 male college Ss for periods from 50 msec. to 10,000 msec. The circle shrank for practically all time periods. The amount of the shrinkage increased to 6,000 msec. for S2 and 8,000 msec. for S1. It is possible that fixation effects influence the apparent size of various visual phenomena.
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