Abstract: Before and after the posterior callosal section, series of experimentswere run on a patient with staged callosal section (1st was the anteriorcallosal section). Before the posterior section, there were no significantdifferences between performance of the left and right sides (T-scope na-ming, object naming and copying), while the transfer of visual and tactilesensory information between the two hemispheres was basically intact.After the posterior section, the right visual field and right hand namingwas superior to the left ones, and the copying of the left hand seemed tobe better; at the same time the deficit of the transfer of the sensoryinformation was found. Naming score of the left visual field and left handwas higher than chance level, this might be relative to the "Right BrainLanguage". The data of orientation comparison and other tests providedsome new evidences supporting the hypothesis of coordination of the twohemispheres.

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