A recent case report of interhemispheric correlational measures in a callosotomized patient by Corsi-Cabrera, Trias, Guevara, Haro and Hernández in 1995 provided evidence taken by the authors of the study to suggest that the corpus callosum may not be crucial to interhemispheric coupling. This conclusion was proposed even though (1) presurgical correlation measures necessary for evaluating coherence changes produced by surgery were not available for this subject and (2) previous studies presenting evidence inconsistent with their conclusions were not discussed. In view of these two shortcomings, the authors' conclusion concerning callosal function may be premature.
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