Inhibitory effects of S1 on the RT to S2 in double (visual-visual) stimulation situations were examined using 10 right-handed subjects, especially from the viewpoint of hemispheric input/output coupling. It was shown that the RT of the left hemisphere (right hand) to S2 after the projection of S1 into the right hemisphere was slower than the RTs under other conditions. The results were interpreted as showing an asymmetrical interhemispheric interfering effect in situations of double stimulation.
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