Electrophysiological aftereffects of high-frequency transcranial random noise stimulation (hf-tRNS): an EEG investigation

Ghin, F, O'Hare, L ORCID: https://orcid.org/0000-0003-0331-3646 and Pavan, A, 2021. Electrophysiological aftereffects of high-frequency transcranial random noise stimulation (hf-tRNS): an EEG investigation. Experimental Brain Research, 239, pp. 2399-2418. ISSN 0014-4819

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Abstract

There is evidence that high-frequency transcranial random noise stimulation (hf-tRNS) is effective in improving behavioural performance in several visual tasks. However, so far there has been limited research into the spatial and temporal characteristics of hf-tRNS-induced facilitatory effects. In the present study, electroencephalogram (EEG) was used to investigate the spatial and temporal dynamics of cortical activity modulated by offline hf-tRNS on performance on a motion direction discrimination task. We used EEG to measure the amplitude of motion-related VEPs over the parieto-occipital cortex, as well as oscillatory power spectral density (PSD) at rest. A time–frequency decomposition analysis was also performed to investigate the shift in event-related spectral perturbation (ERSP) in response to the motion stimuli between the pre- and post-stimulation period. The results showed that the accuracy of the motion direction discrimination task was not modulated by offline hf-tRNS. Although the motion task was able to elicit motion-dependent VEP components (P1, N2, and P2), none of them showed any significant change between pre- and post-stimulation. We also found a time-dependent increase of the PSD in alpha and beta bands regardless of the stimulation protocol. Finally, time–frequency analysis showed a modulation of ERSP power in the hf-tRNS condition for gamma activity when compared to pre-stimulation periods and Sham stimulation. Overall, these results show that offline hf-tRNS may induce moderate aftereffects in brain oscillatory activity.

Item Type:	Journal article
Publication Title:	Experimental Brain Research
Creators:	Ghin, F., O'Hare, L. and Pavan, A.
Publisher:	Springer (part of Springer Nature)
Date:	August 2021
Volume:	239
ISSN:	0014-4819
Identifiers:	Number Type 10.1007/s00221-021-06142- DOI 1441343 Other
Rights:	Post-prints are subject to Springer Nature re-use terms
Divisions:	Schools > School of Social Sciences
Record created by:	Laura Ward
Date Added:	26 May 2021 09:38
Last Modified:	08 Jun 2022 03:00
URI:	https://irep.ntu.ac.uk/id/eprint/42919

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