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KMID : 0191120190340430285
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Journal of Korean Medical Science
2019 Volume.34 No. 43 p.285 ~ p.285
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Can Anodal Transcranial Direct Current Stimulation Increase Steady-State Visual Evoked Potential Responses?
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Kim Do-Won
Kim Eui-Jin
Lee Chan-Y
Im Chang-Hwan
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Abstract
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Background: It has been frequently reported that non-negligible numbers of individuals have steady-state visual evoked potential (SSVEP) responses of low signal-to-noise-ratio (SNR) to specific stimulation frequencies, which makes detection of the SSVEP difficult especially in brain?computer interface applications. We investigated whether SSVEP can be modulated by anodal transcranial direct-current stimulation (tDCS) of the visual cortex.
Methods: Each participant participated in two 20-min experiments?an actual tDCS experiment and a sham tDCS experiment?that were conducted on different days. Two representative electroencephalogram (EEG) features used for the SSVEP detection, SNR and amplitude, were tested for pre- and post-tDCS conditions to observe the effect of the anodal tDCS.
Results: The EEG features were significantly enhanced by the anodal tDCS for the electrodes with low pre-tDCS SNR values, whereas the effect was not significant for electrodes with relatively higher SNR values.
Conclusion: Anodal tDCS of the visual cortex may be effective in enhancing the SNR and amplitude of the SSVEP response especially for individuals with low-SNR SSVEP.
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KEYWORD
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Transcranial Direct Current Stimulation, Electroencephalography, Steady-State Visual Evoked Potential, Primary Visual Cortex
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