In two epileptics with "psychic equivalents" no change in behavior during the convulsive-free periods or in the equivalent state was observed following partial or complete section of the corpus callosum.In one epileptic with a chronic invalid reaction no change was observed following partial section of the corpus callosum.In a fourth mentally retarded epileptic with compulsive-obsessive behavior and suicidal and combative tendencies the improvement which occurred cannot be directly related to the partial sectioning of the corpus callosum.In conclusion, no obvious change in the various manifestations of personality under the changing conditions found in epilepsy could be discerned following partial or complete section of the corpus callosum.Abstract Teaser