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Related Experiment Video

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Symptom-specific amygdala hyperactivity modulates motor control network in conversion disorder.

Thomas Hassa1, Alexandra Sebastian2, Joachim Liepert3

  • 1Lurija Institute for Rehabilitation and Health Sciences, Allensbach, Germany; Neurological Rehabilitation Center Kliniken Schmieder, Allensbach, Germany.

Neuroimage. Clinical
|May 23, 2017
PubMed
Summary
This summary is machine-generated.

Conversion disorder patients show altered brain connectivity between emotion and motor control networks. This study reveals a direct link between emotion processing dysfunction and motor symptoms in conversion disorder.

Keywords:
AmygdalaConversion disorderEmotion processingMotor networkPsychogenic paresisfMRI

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Neurology

Background:

  • Emotion processing is thought to be dysfunctional in conversion disorder.
  • Previous research lacked direct evidence linking emotion processing to motor control in this condition.

Purpose of the Study:

  • To investigate the neural correlates of emotion processing interacting with motor control networks in conversion disorder.
  • To examine functional connectivity between emotion and motor networks during simultaneous emotional and sensorimotor stimulation.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used in 13 conversion disorder patients and 19 healthy controls.
  • A task combined emotional and sensorimotor stimuli, presented separately and simultaneously.
  • Voxelwise statistical mapping and psychophysiological interaction (PPI) analysis were performed.

Main Results:

  • Patients with conversion disorder showed left amygdala hyperactivity during simultaneous emotional stimulation and passive movement of the affected hand.
  • PPI analysis revealed increased functional connectivity between the left amygdala and motor control regions (supplemental motor area, subthalamic nucleus) in patients.

Conclusions:

  • These findings suggest a direct mechanistic link between dysregulated emotion processing and motor control circuitry in conversion disorder.
  • Altered functional connectivity may underlie the motor symptoms observed in conversion disorder.