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KMID : 0357220110230060049
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Journal of Korean Society Physical Therapy
2011 Volume.23 No. 6 p.49 ~ p.53
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The Ongoing Effect of Transcranial Direct Current Stimulation on both the Hemispheres: Single Case fMRI Study
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Kwon Jung-won
Son Sung-Min
Kim Chung-Sun
Cho In-Sul
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Abstract
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Purpose: The purpose of this study is to investigate whether dual-hemisphere transcranial direct current stimulation (tDCS) could induce more cortical activity, compared to single-hemisphere, using functional MRI (fMRI).
Methods: One right-handed healthy subject was recruited. Three phases of dual-hemisphere tDCS (i.e. anodal tDCS over the left-dominant primary sensoriomotor cortex (SM1) and cathodal tDCS over the right-non dominant SM(1) were consecutively delivered on to a subject, during fMRI scanning. The voxel count and the intensity index in the averaged cortical map were analyzed among the three tDCS phases.
Results: Our result showed that cortical activation was observed on all the three phases of the dual-hemisphere tDCS. Voxel count and intensity index were as following; 912 and 4.07 in the first phase, 1102 and 3.90 in the second phase, 1031 and 3.80 in the third phase.
Conclusion: This study demonstrated that application of the dual-hemisphere tDCS could induce cortical activity and maintain to recruit cortical neurons. Our findings suggested that application of dual-hemisphere tDCS could produce efficiency of the ongoing tDCS effect to facilitate cortical excitability.
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KEYWORD
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Transcranial direct current stimulation, Dual-hemispheric stimulation, Cortical activation
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