In experiment I, a triangle wave was used to produce a vertical line. The critical frequency for non-repetitive images of the line during saccade was higher than CFF obtained by fixating on it. In experiment II, the brightness of the vertical line produced by 60KH_Z triangle wave was modulated by a square wave. On the high contrast condition the results were the same with experiment I, but on the low contrast condition any repetitive images were not observed even during saccade. These results were discussed in term of saccadic suppression and visual direction constancy.
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