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Abnormal parietal function in conversion paresis.

Marije van Beilen1, Bauke M de Jong, Esther W Gieteling

  • 1Department of Neurology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands. m.van.beilen@neuro.umcg.nl

Plos One
|November 1, 2011
PubMed
Summary
This summary is machine-generated.

This study identified abnormal parietal activation in conversion paresis patients, suggesting a link between psychological factors and motor control deficits. These findings offer new insights into the neurophysiology of conversion disorder.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Psychology

Background:

  • Medically unexplained symptoms, like conversion disorder, have an unclear etiology.
  • Neuroimaging in conversion paresis is complex due to varied control groups, tasks, and statistical methods.

Purpose of the Study:

  • To integrate diverse neuroimaging approaches for a clearer understanding of conversion paresis.
  • To identify specific neural correlates of conversion paresis using a comprehensive methodology.

Main Methods:

  • Included normal controls and malingerers to control for conversion paresis.
  • Studied both movement execution and imagery, contrasting within-group and between-group activation.
  • Analyzed both flipped and unflipped data to reveal hemisphere-specific effects.

Main Results:

  • Identified abnormal parietal activation specific to conversion paresis patients.
  • Observed reduced activity in prefrontal cortex, supramarginal gyrus, and precuneus.
  • Found hemisphere-specific activation lateralized consistently, irrespective of paresis side.

Conclusions:

  • Abnormal parietal activation and altered activity in prefrontal and parietal regions are key findings in conversion paresis.
  • These regions may represent an interface between psychological mechanisms and motor control disturbances.
  • The study provides an integrative neurophysiological perspective on conversion disorder etiology.