[Corpus callosum, interhemispheric interaction and brain right hemisphere function].
A complex clinico-neuropsychological study, using A.R. Luria's method, has been conducted before and after surgery in 36 patients with arteriovenous malformations of the corpus callosum. Symptoms of local lesions in different compartments of the corpus callosum are described. The symptoms of the partial corpus callosum lesion are shown to be modally specific, but only to a certain extent. Isolated appearance of dyscopia or dysgraphia or symptoms is possible. A combination of lesions in the medial brain areas (cingulated gyrus, frontal lobes) with corpus callosum malformation significantly augmented their dysfunction. In case of impairment in frontal parts of the corpus callosum, symptoms of frontal lobes dysfunction were observed. The corpus callosum malformations resulted in right hemisphere dysfunction in the sphere of emotions, perception and spatial activity. As it was shown earlier, right hemisphere integrates impulses from both sides of the space, being first involved in activity, realizing its initial stages. The author suggests that such a synthetic right hemisphere activity, in the presence of closed relations to "conscious" left hemisphere, is necessary for formation of the whole picture of the separate objects, as well as of certain types of activity. In this view, right hemisphere may be relatively considered as a dominant one but not vice versa.
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D000293:Adolescent; D001921:Brain / Q000503:physiopathology* / Q000601:surgery; D002533:Cerebral Angiography; D002543:Cerebral Hemorrhage / Q000175:diagnosis / Q000209:etiology; D003072:Cognition Disorders / Q000175:diagnosis / Q000209:etiology; D003337:Corpus Callosum / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000150:complications / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery; D008297:Male; D009434:Neural Pathways / Q000502:physiology*; D009483:Neuropsychological Tests; D019635:Neurosurgical Procedures; D014057:Tomography, X-Ray Computed