Interhemispheric modulation of dual-mode, noninvasive brain stimulation on motor function
Eunhee Park1, Yun-Hee Kim1, Won Hyuk Chang1
1Department of Physical and Rehabilitation Medicine, Center for Prevention and Rehabilitation, Heart Vascular and Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
Annals of Rehabilitation Medicine
|July 16, 2014
Summary
Simultaneous brain stimulation using repetitive transcranial magnetic stimulation (rTMS) and transcranial direct current stimulation (tDCS) improved motor functions and cortical excitability. Anodal tDCS with rTMS showed the most significant positive effects on motor performance.
Area of Science:
- Neuroscience
- Motor Control
- Brain Stimulation
Background:
- Investigating non-invasive brain stimulation techniques for motor function enhancement.
- Understanding interhemispheric interactions in the motor cortex.
Purpose of the Study:
- To evaluate the effects of simultaneous, bihemispheric, dual-mode stimulation (rTMS and tDCS) on motor functions and cortical excitability in healthy individuals.
Main Methods:
- Twenty-five healthy volunteers received four conditions of simultaneous stimulation: high-frequency rTMS over the right primary motor cortex (M1) paired with sham, anodal, or cathodal tDCS over the left M1, and a sham-sham condition.
- Cortical excitability (motor evoked potentials) and motor functions (Purdue Pegboard, box and block tests) were assessed pre- and post-stimulation.
Main Results:
- Simultaneous stimulation with high-frequency rTMS (right M1) and anodal tDCS (left M1) significantly increased motor evoked potential amplitudes and improved performance on motor tasks.
- High-frequency rTMS alone also enhanced motor evoked potentials, but to a lesser extent than the combined anodal tDCS protocol.
Conclusions:
- Combined anodal tDCS and high-frequency rTMS can effectively modulate interhemispheric pathways and induce homeostatic plasticity.
- This dual-mode stimulation approach shows promise for enhancing cortical excitability and motor functions.
Keywords:
Bihemispheric stimulationInterhemispheric modulationMotor functionTranscranial direct current stimulation (tDCS)Transcranial magnetic stimulation (TMS)
