Abstract: The perceptual interference effect is less likely to be identified if it is presented incrementally than if it is presented all at once.By means of the accurate?ratio of standard condition performance to ascending condition performance,the experiment examined amply the change trend of the effect s magnitude in different viewing times.The results showed: though the significant interference effect could be found in degraded Chinese characters while the viewing time was 2,4 or 8 seconds,the viewing time didn t...