RIGHT UNILATERAL AGRAPHIA FOLLOWING CALLOSAL INFARCTION IN A LEFT-HANDER

A left-handed Japanese man is reported who presented right-hand agraph ia and tactile anemia following callosal infarction. Magnetic resonanc e imaging revealed an ischemic lesion extending from the posterior hal f of the trunk to the splenium of the corpus callosum. In his right ha ndwriting, the 'Kana' (phonogram) was more severely impaired than the 'Kanji' (ideogram), and the most frequent typewriting error was morpho logical followed by neographism. His visuoconstructional ability was a lso more impaired in the right hand than in the left. Right-hand agrap hia in our case is readily explained by the right hemisphere dominance both for language and visuoconstructional ability.