Alternative Motor Task-Based Pattern Training With a Digital Mirror Therapy System Enhances Sensorimotor Signal...

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Motor Control

Background:

• Mirror therapy (MT) is established for motor learning and recovery post-stroke.
• Digital mirror therapy (DMT) offers new ways to explore MT's effects.
• Cortical reorganization is key to motor recovery.

Purpose of the Study:

• To compare cortical activation under three visual feedback conditions: no mirror visual feedback (NoMVF), bilateral synchronized task-based mirror visual feedback training (BMVF), and reciprocal task-based mirror visual feedback training (RMVF).
• To investigate the effects of these conditions on event-related desynchronization (ERD) in mu and beta bands within specific brain areas (ipsilesional, contralesional hemispheres, and SMA).

Main Methods:

• EEG recordings were used to measure ERD in mu and beta bands during DMT in stroke patients and a control group.
• Cortical activation was analyzed across three time-phases (P0, P1, P2) and three brain areas (C3, C4, Cz).
• Repeated-measures analyses of variance examined the impact of group, visual feedback condition, time-phase, and brain area on ERD.

Main Results:

• Cortical activation (ERD) was generally higher in the control group than in the stroke group.
• ERD was significantly greater under RMVF, followed by BMVF, and then NoMVF conditions, across both mu and beta bands.
• The supplementary motor area (SMA) showed increased cortical activation, particularly under the RMVF condition, in both groups.

Conclusions:

• Reciprocal mirror visual feedback training (RMVF) leads to enhanced cortical activation in the SMA.
• The findings support the hypothesis that RMVF training may be beneficial for stroke patients' motor recovery.
• Digital mirror therapy provides a valuable tool for studying and optimizing rehabilitation strategies.