Interhemispheric transfer in patients with incomplete section of the corpus callosum. Anatomic verification with magnetic resonance imaging
G. L. Risse, J. Gates, G. Lund, R. Maxwell and A. Rubens
Minnesota Comprehensive Epilepsy Program, University of Minnesota, Minneapolis.
Tests of interhemispheric disconnection including visual, somesthetic,
kinesthetic, auditory, and complex motor functions were performed on seven
patients with chronic epilepsy who had undergone partial surgical section
of the corpus callosum, verified by magnetic resonance imaging. Two
patients with only one third of the splenium remaining demonstrated
disconnection syndromes involving all modalities except vision, which was
completely intact. Five patients had lesions involving the rostrum and the
anterior two thirds to four fifths of the body of the callosum, with the
splenium spared. They demonstrated little evidence of disconnection in the
modalities indicated, except for left ear suppression on a dichotic
listening task and partial somatosensory disruption in some cases. These
results emphasize the importance of the posterior corpus callosum for
interhemispheric sensory and sensorimotor transfer, although some
discrepancies between current behavioral data and previous anatomic
findings remain.
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