Abstract: Tachistoscopic visual half-field test was used to investigate functional hemispheric laterality for three kinds of cognitive processing task (reading,simple addition and conceptual decision)on Arabic numerals and numerals in capital of Chinese characters.The results were as follows:1 When determined by percentage of correct reaction,there were no significant hemispheric advantages on all three tasks for two kinds of numerals.2When determined by reaction-time of correct reaction,there was a significant right visual half-field(left hemisphere)advantage on odd-even conceptual decision task but not on reading and simple addition tasks for two kinds of numerals.

Key words: tachistoscopic visual half-field test, cerebral functional lateralization, three kinds of cognitive processing tasks, visual spatial frequency