[Disturbance of the premorbid knowledge reproduction in patients with hemispheric and intraventricular brain damages].

One hundred four patients with hemispheric arteriovenous malformations (AVM) (frontal, parietal and temporal brain lobes), 21 patients with craniopharyngiomas and 21 patients with aresorptive hydrocephalus were studied. Disturbance of the premorbid knowledge reproduction was found in 12 patients with hemispheric AVM. All the patients survived severe intraventricular hemorrhage. Similar memory defects were detected in 3 patients with craniopharyngiomas and in 12 patients with hydrocephalus. In these cases medio-basal (periventricular) brain regions (frontal and temporal), preferentially of right hemisphere, and diencephalic region were damaged. Selective retrograde amnesia in all above damages was characterized by inability to recall dates, less often autobiography and events content. The author stressed a role of the processes of events sequence representation and of traces selectivity in "old" knowledge actualization in the mechanisms of studied disturbances development. A possible role of right and left hemispheres as well as diencephalic region in information coding and decoding is discussed.