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Quantitative EEG in never-treated schizophrenic patients

M Omori¹, Y Koshino, T Murata

¹Department of Neuropsychiatry, Fukui Medical School, Japan.

Biological Psychiatry

|September 1, 1995

Summary

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Electroencephalography (EEG) slowing is present in patients with schizophrenia, even without medication. This EEG slowing in schizophrenia correlates with symptom severity, suggesting a link to the disorder's psychopathology.

Area of Science:

Neuroscience
Psychiatry
Clinical Neurophysiology

Background:

Schizophrenia is a complex psychiatric disorder.
Previous studies suggest altered brain activity in schizophrenia.
The role of electroencephalography (EEG) slowing in unmedicated patients requires clarification.

Purpose of the Study:

To investigate EEG slowing in acute, never-treated patients with schizophrenia.
To compare EEG patterns between schizophrenic patients and healthy controls.
To explore the relationship between EEG slowing and psychopathology severity.

Main Methods:

Electroencephalography (EEG) analysis using computerized wave-form recognition.
Inclusion of 20 acute never-treated schizophrenic patients and 20 age-matched healthy controls.

Related Experiment Videos

Assessment of EEG frequency bands, specifically theta and alpha rhythms.

Main Results:

Schizophrenic patients exhibited increased fast theta (6-8 Hz) and slow alpha (8-9 Hz) EEG activity compared to controls.
Patients showed decreased fast alpha activity (9-13 Hz).
A negative correlation was observed between average EEG frequency at O1 and Brief Psychiatric Rating Scale (BPRS) total and positive symptom scores in schizophrenics.

Conclusions:

EEG slowing, characterized by altered alpha rhythm frequency, is confirmed in schizophrenia.
This EEG slowing may be associated with the expression of psychopathology in schizophrenia.
Findings highlight potential neurophysiological markers in early-stage schizophrenia.