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Related Experiment Videos

Thalamic abnormalities in schizophrenia visualized through magnetic resonance image averaging

N C Andreasen1, S Arndt, V Swayze

  • 1Mental Health Clinical Research Center, College of Medicine.

Science (New York, N.Y.)
|October 14, 1994
PubMed
Summary

Schizophrenia symptoms may stem from thalamus abnormalities. This brain region

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Brain Imaging

Background:

  • Schizophrenia presents complex cognitive and emotional symptoms.
  • Previous research often linked single symptoms to single brain regions.
  • An alternative hypothesis suggests midline neural circuit dysfunction.

Purpose of the Study:

  • To explore the hypothesis that midline neural circuit lesions explain schizophrenia's diverse symptoms.
  • To identify specific brain regions associated with schizophrenia.

Main Methods:

  • Magnetic resonance imaging (MRI) was used for patients and controls.
  • Brain images were averaged to create "average schizophrenic" and "average normal" brains.
  • Image subtraction and effect size mapping identified areas of difference.

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Main Results:

  • Significant regional abnormalities were found in the thalamus and adjacent white matter.
  • These findings support the role of the thalamus in schizophrenia.

Conclusions:

  • Thalamic abnormalities and related circuitry offer a parsimonious explanation for schizophrenia's varied symptoms.
  • A defect in sensory input filtering/gating by the thalamus could underlie these symptoms.