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Sensory Attenuation Assessed by Sensory Evoked Potentials in Functional Movement Disorders

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  • Antonella Macerollo
  • Jui-Cheng Chen
  • Isabel Pareés
  • Panagiotis Kassavetis
  • James Morvan Kilner
  • Mark John Edwards

Abstract

Background: Functional (psychogenic) movement disorders (FMD) have features associated with voluntary movement (e.g. distractibility) but patients report movements to be out of their control. One explanation for this phenomenon is that sense of agency for movement is impaired. The phenomenon of reduction in the intensity of sensory experience when movement is self-generated and a reduction in sensory evoked potentials (SEPs) amplitude at the onset of self-paced movement (sensory attenuation) have been linked to sense of agency for movement. Methods: We compared amplitude of SEPs from median nerve stimulation at rest and at the onset of a self-paced movement of the thumb in 17 patients with FMD and 17 healthy controls. Results: Patients showed lack of attenuation of SEPs at the onset of movement compared to reduction in amplitude of SEPs in controls. FMD patients had significantly different ratios of movement onset to rest SEPs than did healthy controls at each electrode: 0.79 in healthy controls and 1.35 in patients at F3 (t = -4.22, p

Suggested Citation

  • Antonella Macerollo & Jui-Cheng Chen & Isabel Pareés & Panagiotis Kassavetis & James Morvan Kilner & Mark John Edwards, 2015. "Sensory Attenuation Assessed by Sensory Evoked Potentials in Functional Movement Disorders," PLOS ONE, Public Library of Science, vol. 10(6), pages 1-6, June.
    • Handle: RePEc:plo:pone00:0129507
    DOI: 10.1371/journal.pone.0129507
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