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Updated: Jun 5, 2026

Standardized Data Acquisition for Neuromelanin-Sensitive Magnetic Resonance Imaging of the Substantia Nigra
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Antipsychotic dose and diminished neural modulation: a multi-site fMRI study.

C Abbott1, M Juárez, T White

  • 1Dept. of Psychiatry, University of New Mexico, Albuquerque, New Mexico 87131, United States. cabbott@salud.unm.edu

Progress in Neuro-Psychopharmacology & Biological Psychiatry
|December 28, 2010
PubMed
Summary

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Antipsychotic medication in schizophrenia patients affects neural networks, particularly motor and default mode networks. Higher doses and typical antipsychotics show diminished activation and modulation in these networks.

Area of Science:

  • Neuroimaging
  • Psychiatry
  • Schizophrenia Research

Background:

  • The impact of antipsychotics on brain activity in schizophrenia is not well understood.
  • Functional magnetic resonance imaging (fMRI) is used to study brain function.

Purpose of the Study:

  • To investigate how antipsychotic medication influences neural networks during a motor task in schizophrenia patients.
  • To analyze data from a large, multi-site fMRI study.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) on 79 medicated schizophrenia patients and 114 controls.
  • Applied independent component analysis (ICA) to identify neural networks.
  • Regressed ICA time courses with experimental design and analyzed group differences and correlations with chlorpromazine equivalents.

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Main Results:

  • Significant group differences were observed in motor, default mode, and attentional networks.
  • Chlorpromazine equivalents correlated with motor and default mode networks.
  • Typical antipsychotics showed less positive modulation in motor/caudate networks compared to atypical antipsychotics.

Conclusions:

  • Antipsychotic dosage appears to reduce neural activation in motor and default mode networks in schizophrenia.
  • Typical antipsychotics may decrease positive modulation in subcortical motor networks.
  • Antipsychotics represent a potential confounding factor in fMRI studies of schizophrenia.