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Related Experiment Videos

Effects of cerebral hemispheric laterality on the span of apprehension of schizophrenic and healthy subjects.

R Mass1, T Schoemig, J Novikov

  • 1University Hospital Eppendorf, Psychiatric Clinic, Martinistrasse 52, 20246 Hamburg, Germany. mass@uke.uni-hamburg.de

European Archives of Psychiatry and Clinical Neuroscience
|April 24, 2001
PubMed
Summary

Schizophrenia patients showed impaired left visual field performance, linked to symptom severity and medication. Both groups performed better in the right visual field on the Span of Apprehension task.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • Hemispheric laterality influences cognitive functions.
  • Schizophrenia is associated with various cognitive deficits.

Purpose of the Study:

  • To investigate hemispheric differences in visual field performance in schizophrenia patients.
  • To explore correlations between cognitive performance and psychopathology in schizophrenia.

Main Methods:

  • A forced-choice Span of Apprehension task was administered to 48 schizophrenic inpatients and matched healthy controls.
  • Performance was assessed separately for left and right visual fields.
  • Correlations with psychopathology and medication dosage were analyzed.

Main Results:

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  • Both groups exhibited higher performance in the right visual field.
  • Schizophrenic patients showed significant negative correlations between left visual field performance and psychopathology, particularly auditory verbal hallucinations.
  • In patients on atypical neuroleptics, higher drug dosage correlated with poorer left visual field performance.

Conclusions:

  • Hemispheric laterality plays a role in visual processing deficits in schizophrenia.
  • Left visual field performance may serve as a biomarker for symptom severity and treatment response in schizophrenia.