Short term memory for a nonverbal tactual task after cerebral commissurotomy

Using a tactual modification of the Memory for Designs Test, it was found that the right hemispheres of subjects having complete cerebral commissurotomy were markedly superior to their left hemispheres. This result is further explicit for independent hemispheric memories as well as for a right hemispheric superiority in the recollection of spatial configurations. Subjects with partial commissurotomy (sparing the splenium) performed in the normal range with each hand, confirming previous conclusions as to the ability of a small callosal remnant to effect interhemispheric transfer.