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Lateralization01:28

Lateralization

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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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Implicit motor imagery using laterality recognition in functional movement disorders.

Dharsha Navaratnam1, Karl Harm2, Alison Fenton2

  • 1Active Rehabilitation Physiotherapy, Brisbane, Australia; Princess Alexandra Hospital, Brisbane, Australia.

Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia
|June 13, 2021
PubMed
Summary
This summary is machine-generated.

People with functional movement disorder (FMD) show slower reaction times and reduced accuracy in judging hand laterality, indicating sensorimotor processing deficits. These findings highlight potential underlying neurological differences in FMD.

Keywords:
Conversion disorderFunctional movement disorderLaterality perceptionMovement disorderPhysiotherapy

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Area of Science:

  • Neuroscience
  • Neurology
  • Psychology

Background:

  • Functional movement disorder (FMD) involves disabling motor symptoms without clear organic causes.
  • Sensorimotor processing, crucial for movement and body awareness, may be impaired in FMD.
  • Laterality recognition relies on integrated sensorimotor information.

Purpose of the Study:

  • To compare hand laterality recognition performance between individuals with FMD and healthy controls.
  • To investigate the relationship between sensorimotor processing deficits and FMD severity.

Main Methods:

  • Prospective observational study comparing 30 FMD patients and 30 age-matched controls.
  • Assessed reaction time (RT) and accuracy (ACC) in a hand laterality recognition task.
  • Explored correlations between RT, ACC, and the Simplified Functional Movement Disorders Rating Scale (SFMDRS).

Main Results:

  • FMD patients exhibited significantly slower RT (0.6s slower) and lower ACC (8.9% lower) than controls.
  • After adjusting for SFMDRS, RT remained slower in FMD patients, but ACC differences diminished.
  • A moderate negative correlation between RT and ACC was observed in FMD patients.

Conclusions:

  • Individuals with FMD demonstrate significant deficits in sensorimotor processing related to laterality recognition.
  • These findings suggest underlying sensorimotor network alterations contribute to FMD symptoms.
  • Further research into sensorimotor processing may offer novel therapeutic targets for FMD.