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Can Anodal Transcranial Direct Current Stimulation Increase Steady-State Visual Evoked Potential Responses?
Journal of Korean Medical Science ; : e285-2019.
Article in English | WPRIM | ID: wpr-765114
ABSTRACT

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 braincomputer 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.
Subject(s)

Full text: Available Index: WPRIM (Western Pacific) Main subject: Visual Cortex / Electrodes / Electroencephalography / Evoked Potentials, Visual / Transcranial Direct Current Stimulation Language: English Journal: Journal of Korean Medical Science Year: 2019 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Visual Cortex / Electrodes / Electroencephalography / Evoked Potentials, Visual / Transcranial Direct Current Stimulation Language: English Journal: Journal of Korean Medical Science Year: 2019 Type: Article