Abstract: Our past experiments showed that in correctly recognizing isolatedChinese characters, neither of the two hemispheres played a dominantrole, but we were not ready to draw any final conclusions. In the present study, we selected eight Chinese characters and setthem against four different background noise. The signal to noise ratioswere ∞, 6.66, 4 and 2.85 respectively. The subjects of our experimentwere 20 college students, 10 males and 10 females, whose ages ranged from19 to 20. The time of appearance for the stimuli was 60 msec. The results of the experiment were as follows: 1) Without noise interference, there was no marked differencebetween the left and right visual fields, nor was there any differenceswhen the signal-to-noise ratio was 6.66. 2) It was only when the signal-to-noise ratio was 4 and thedifficulty of recognition reached a fairly high level that the dominanceof the right visual field became obvious. 3) Whatever the degree of difficulty, reaction time of the leftvisual field was shorter than that of the right, but in the correctnessof recognition of the right visual field displayed some dominance.

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