Inter-brain phase synchronization (IBPS) following individual transcranial alternating current stimulation (tACS)

Publikationstyp:
Poster
Metadaten:
Abstract
Modulating the brain oscillations using individual alpha frequency (IAF) reveals causal relationships within the brain oscillations’ behaviour (Bächinger et al. 2017). I.e., tACS allows a non-invasive adjustment of applied EEG frequency bands. This can alter cognitive (Klink et al. 2020) and motor performance (Berger et al. 2017, Pixa et al. 2018, Pollok et al. 2015). Usually, EEG power of the frequency spectrum is analysed to demonstrate tACS after-effects (Kasten et al. 2016, Neuling et al. 2013). Yet, the role of phase synchronization in tACS effects must be clarified. Therefore, the perspective of data interpretation is changed using the Circular Correlation Coefficient (CCorr, Jammalamadaka & SenGupta 2001, Burgess 2013). Furthermore, the time observing possible offline effects was increased compared to the latest state of the art (Orendáčová & Kvašňák, 2021). In our study, 20-min IAF-tACS at P3/P4 (1.5mA, 15s ramp up/down) was applied on 17 subjects (Klimesch 1999, Mioni et al. 2020). EEG was recorded while performing vigilance tests and having eyes closed/ eyes opened measures (60s). The procedures were held before (pre) and after the stimulation. Post tACS, the tasks were repeated every 25 minutes, (post1-post11). Thereby, this study reveals tACS after-effects of 4.5-5 hours in total. A two-way ANOVA – using CCorr as dependent measure – was calculated for sixty data pairs (alpha rhythm, 8-12 Hz). The factors are time (pre, post1-11) and channel (CP5, CP6, CP1, CP2). The main factor TIME yielded a significant result (F5,45=2.53; η2p=.291; p=.042) indicating higher CCorr values post tACS. Thereby, we can assume a higher IBPS after than before the tACS. Neither CHANNEL nor the interaction of both factors showed significant results. We will present extended results by both using more pairs of data and including data of the sham and a third group (1.0mA IAF tACS).
Autoren
Autoren-URL
https://www.sportpsychologie.uni-mainz.de/marc-varel/
Schlüsselwörter
  • tACS
  • offline effects
  • phase synchronization
  • CCorr
Presented at
5th International Brain Stimulation Conference
Datum der Veröffentlichung
2023
Datum der Datenerfassung
2023
Titel
Inter-brain phase synchronization (IBPS) following individual transcranial alternating current stimulation (tACS)

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