[EEG changes in schizophrenic diseases--a critical review].

To identify specific changes in the electroencephalogram of schizophrenic patients has been an important target of clinical neurophysiology ever since the introduction of the EEG. Results of EEG-amplitude- and frequency-analysis in schizophrenics--although sometimes contradictory--are presented. Special emphasis is laid upon possible clinical applicabilities, for instance the prediction of the clinical course by means of neurophysiological changes after administration of a neuroleptic test dose. Finally, the usefulness of examining electrophysiological changes in such a heterogeneous group, as schizophrenics are, is discussed critically.