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Visual dysfunction in treated schizophrenia suggested by visual evoked potentials from pattern-reversal stimulation.

I Jibiki¹, Y Takizawa, N Yamaguchi

¹Department of Neuropsychiatry, Kanazawa University School of Medicine, Japan.

European Archives of Psychiatry and Clinical Neuroscience

|January 1, 1991

Summary

Schizophrenic patients on medication showed abnormal visual evoked potentials (VEPs). Their VEPs did not change with visual information alterations, indicating visual system dysfunction.

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Area of Science:

Neuroscience
Psychiatry
Visual System Function

Background:

Schizophrenia is a complex psychiatric disorder.
Visual processing deficits are reported in schizophrenia.
Medication effects on visual function in schizophrenia require further investigation.

Purpose of the Study:

To investigate visual evoked potentials (VEPs) in treated schizophrenic patients.
To compare VEPs between schizophrenic patients and healthy controls.
To assess the impact of visual information changes on VEPs in schizophrenia.

Main Methods:

Pattern-reversal stimulation was used to elicit steady-state VEPs.
VEP amplitudes were recorded in treated schizophrenic patients and age/sex-matched normal subjects.

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The effect of varying check size on VEP amplitudes was analyzed.

Main Results:

VEP amplitudes exhibited greater variability in schizophrenic patients compared to controls.
Schizophrenic patients showed minimal VEP amplitude changes with altered check sizes.
Normal subjects demonstrated a significant check size effect on VEP amplitudes.

Conclusions:

Treated schizophrenic patients display visual system dysfunction.
This dysfunction includes an impaired ability to adapt to changes in visual information.
VEP analysis can reveal visual processing abnormalities in schizophrenia.