Cortical neural activity evoked by bilateral and unilateral mirror therapy after stroke

Ruei Yi Tai, Jun Ding Zhu, Chia Hsiung Cheng, Yi Jhan Tseng, Chih Chi Chen, Yu Wei Hsieh

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: This study aimed to investigate the differential effects of bilateral and unilateral mirror therapy (MT) on motor cortical activations in stroke patients by magnetoencephalography (MEG). Methods: Sixteen stroke patients and 16 right-handed healthy volunteers were recruited. All participants were required to perform 4 conditions: resting, no mirror with bilateral hand movements (Bilateral-No mirror), mirror with bilateral hand movements (Bilateral-Mirror) and mirror with unilateral hand movements (Unilateral-Mirror). Beta oscillatory activities in the primary motor cortex (M1) were collected during each condition using MEG. The percentage change of beta oscillatory activity was calculated for each condition to correct the baseline differences. Results: In the stroke group, the percentage change of M1 beta oscillatory activity significantly decreased more in the Bilateral-Mirror condition than in the Bilateral-No mirror and Unilateral-Mirror conditions. In the healthy group, no significant differences in the percentage change of beta oscillatory activity were found among the 3 conditions. Further, a significant difference in the percentage change of beta oscillatory activity only in the Bilateral-Mirror condition was found between the 2 groups. Conclusions: This study provides new information on the differential cortical activations modulated by bilateral and unilateral MT. Significance: Bilateral MT led to greater M1 neural activities than unilateral MT and bilateral movements without a mirror in stroke patients.

Original languageEnglish
Pages (from-to)2333-2340
Number of pages8
JournalClinical Neurophysiology
Volume131
Issue number10
DOIs
Publication statusPublished - Oct 2020

Keywords

  • magnetoencephalography (MEG)
  • Mirror therapy
  • Mirror visual feedback
  • Stroke

ASJC Scopus subject areas

  • Sensory Systems
  • Neurology
  • Clinical Neurology
  • Physiology (medical)

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