title: EEG states of the brain, information processing, and schizophrenic primary symptoms.
abstract: The electroencephalographic (EEG) reactivity to auditory information (the central component of the orienting reaction) was used to examine brain states underlying information processing in acute and recovered medication-free schizophrenics and matched controls. EEG reactivity was assessed as information-induced changes of parameters extracted from power spectral frequency analysis of the ongoing EEG. EEG reactivity in controls and schizophrenics in remission was largely similar. Acute schizophrenics showed a deviant (ectropic) reactivity, which consisted of changes within the 2-8 Hz band, and of either severely reduced or absent response in the 8-13 Hz (alpha) band. These results indicate an ectropic brain state during cognitive processing of received information during the period of acute schizophrenic symptomatology.
mesh_terms: D000208:Acute Disease; D000328:Adult; D001307:Auditory Perception / Q000502:physiology; D001921:Brain / Q000503:physiopathology; D003072:Cognition Disorders / Q000523:psychology*; D004569:Electroencephalography / Q000379:methods*; D005071:Evoked Potentials; D005260:Female; D006801:Humans; D008297:Male; D011939:Mental Recall / Q000502:physiology; D011930:Reaction Time / Q000502:physiology; D012559:Schizophrenia / Q000503:physiopathology / Q000534:rehabilitation; D012565:Schizophrenic Psychology; D014796:Visual Perception / Q000502:physiology