[Intercentral correlations in the cerebral cortex according to the EEG coherence index after restoration of consciousness and speech following prolonged coma].
Power spectra and coherence function of EEG of various cortical areas of both hemispheres were analyzed in 9 patients with extremely protracted loss of consciousness. Five patients were in the state of posttraumatic apallic syndrome lasting for more than 4 years in one patient, and 4-9 months with successive lethal outcome in 4 patients. One patient for more than 2 years was in a state of areactivity to external signals. In 3 patients the process of recovery of consciousness and speech began in 1-2 months. At the apallic syndrome, only low-frequency EEG components were present in spectrograms, and the values of coherence function were sharply decreased. With recovering consciousness and speech, a gradual appearance of alpha-activity was observed as well as an increase of coherence values at the frequency of the alpha-rhythm. The recovery of intercentral EEG relations in the motor-verbal cortical area was shown to play a special role in further normalization of connections in the cerebral cortex.
D001930:Brain Injuries / Q000150:complications*; D002540:Cerebral Cortex / Q000503:physiopathology*; D003128:Coma / Q000209:etiology / Q000503:physiopathology*; D003243:Consciousness / Q000502:physiology; D003655:Decerebrate State / Q000503:physiopathology; D004569:Electroencephalography; D006801:Humans; D013060:Speech / Q000502:physiology; D013577:Syndrome
Mezhtsentral'nye otnosheniia v kore bol'shogo mozga po pokazateliu kogerentnosti EEG pri vosstanovlenii soznaniia i rechi posle dlitel'noĭ komy.