Intermittent tACS during a visual task impacts neural oscillations and LZW complexity

Castellano, Marta; Ibanez-Soria, David; Kroupi, Eleni; Acedo, Javier; Campolo, Michela; Soria-Frisch, Aureli; Valls‐Solé, Josep; Verma, Ajay; Ruffini, Giulio

doi:10.1007/s00221-020-05820-z

Cited by 4 publications

(7 citation statements)

References 54 publications

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“…Alpha-gamma phase-amplitude CFI was observed during 20 min of 1 mA 10 Hz tACS applied to Oz-Cz regions (Helfrich et al, 2016). A different kind of CFI was reported in Castellano et al (2020) study in which amplitudes of both alpha and gamma bands were increased during 20 min of 10 Hz tACS passing among PO3, PO4, and Oz (Castellano et al, 2020). On the contrary, another study found that gamma power was decreased during tACS, with the individualized intensity and individualized alpha frequency, passing between Oz and Cz (Herring et al, 2019).…”

Section: Online Effects Of Tacs and Nfb On Alpha Bandmentioning

confidence: 86%

“…Therefore, most tACS studies have focused on the evaluation of the offline effects of tACS rather than on evaluating the online ones (Zaehle et al, 2010 ; Neuling et al, 2013 ; Vossen et al, 2015 ; Kasten et al, 2016 ; Stecher et al, 2017 ; Prim et al, 2019 ). However, there are a couple of tACS studies, which managed at least to partially overcome that problem and the measured effects of tACS on an ongoing EEG activity (Helfrich et al, 2014b ; Ruhnau et al, 2016 ; Kasten et al, 2018a ; Castellano et al, 2020 ). For an analysis of the online EEG activity, the interleaved EEG-tACS protocol uses very short intervals of tACS, which are separated by short non-stimulation periods during which EEG activity is recorded (Castellano et al, 2020 ).…”

Section: Mechanisms Of Tacs and Nfbmentioning

confidence: 99%

“…However, there are a couple of tACS studies, which managed at least to partially overcome that problem and the measured effects of tACS on an ongoing EEG activity (Helfrich et al, 2014b ; Ruhnau et al, 2016 ; Kasten et al, 2018a ; Castellano et al, 2020 ). For an analysis of the online EEG activity, the interleaved EEG-tACS protocol uses very short intervals of tACS, which are separated by short non-stimulation periods during which EEG activity is recorded (Castellano et al, 2020 ). This kind of measurement was exploited in Castellano et al ( 2020 ) study, which reported that 10 Hz tACS was delivered for 27 min among PO3, PO4, and Oz in the following way: 5-s tACS epochs were separated by epochs during which EEG was recorded.…”

Section: Mechanisms Of Tacs and Nfbmentioning

confidence: 99%

“…For an analysis of the online EEG activity, the interleaved EEG-tACS protocol uses very short intervals of tACS, which are separated by short non-stimulation periods during which EEG activity is recorded (Castellano et al, 2020 ). This kind of measurement was exploited in Castellano et al ( 2020 ) study, which reported that 10 Hz tACS was delivered for 27 min among PO3, PO4, and Oz in the following way: 5-s tACS epochs were separated by epochs during which EEG was recorded. A particular study showed increases in alpha amplitude after 5-s intervals of 10-Hz tACS (Castellano et al, 2020 ).…”

Section: Mechanisms Of Tacs and Nfbmentioning

confidence: 99%

“…This kind of measurement was exploited in Castellano et al ( 2020 ) study, which reported that 10 Hz tACS was delivered for 27 min among PO3, PO4, and Oz in the following way: 5-s tACS epochs were separated by epochs during which EEG was recorded. A particular study showed increases in alpha amplitude after 5-s intervals of 10-Hz tACS (Castellano et al, 2020 ).…”

Section: Mechanisms Of Tacs and Nfbmentioning

confidence: 99%

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Effects of Transcranial Alternating Current Stimulation and Neurofeedback on Alpha (EEG) Dynamics: A Review

Orendáčová

Kvašňák

2021

Front. Hum. Neurosci.

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Transcranial alternating current stimulation (tACS) and neurofeedback (NFB) are two different types of non-invasive neuromodulation techniques, which can modulate brain activity and improve brain functioning. In this review, we compared the current state of knowledge related to the mechanisms of tACS and NFB and their effects on electroencephalogram (EEG) activity (online period/stimulation period) and on aftereffects (offline period/post/stimulation period), including the duration of their persistence and potential behavioral benefits. Since alpha bandwidth has been broadly studied in NFB and in tACS research, the studies of NFB and tACS in modulating alpha bandwidth were selected for comparing the online and offline effects of these two neuromodulation techniques. The factors responsible for variability in the responsiveness of the modulated EEG activity by tACS and NFB were analyzed and compared too. Based on the current literature related to tACS and NFB, it can be concluded that tACS and NFB differ a lot in the mechanisms responsible for their effects on an online EEG activity but they possibly share the common universal mechanisms responsible for the induction of aftereffects in the targeted stimulated EEG band, namely Hebbian and homeostatic plasticity. Many studies of both neuromodulation techniques report the aftereffects connected to the behavioral benefits. The duration of persistence of aftereffects for NFB and tACS is comparable. In relation to the factors influencing responsiveness to tACS and NFB, significantly more types of factors were analyzed in the NFB studies compared to the tACS studies. Several common factors for both tACS and NFB have been already investigated. Based on these outcomes, we propose several new research directions regarding tACS and NFB.

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Section: Online Effects Of Tacs and Nfb On Alpha Bandmentioning

confidence: 86%

Section: Mechanisms Of Tacs and Nfbmentioning

confidence: 99%

Section: Mechanisms Of Tacs and Nfbmentioning

confidence: 99%

Section: Mechanisms Of Tacs and Nfbmentioning

confidence: 99%

Section: Mechanisms Of Tacs and Nfbmentioning

confidence: 99%

See 3 more Smart Citations

Effects of Transcranial Alternating Current Stimulation and Neurofeedback on Alpha (EEG) Dynamics: A Review

Orendáčová

Kvašňák

2021

Front. Hum. Neurosci.

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Transcranial Alternating Current Stimulation to Modulate Alpha Activity: A Systematic Review

Koninck

Brazeau

Guay

et al. 2023

Neuromodulation: Technology at the Neural Interface

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Closed-Loop Current Stimulation Feedback Control of a Neural Mass Model Using Reservoir Computing

Pei

Shinn‐Cunningham

2023

Applied Sciences

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Transcranial electrical stimulation (tES) is a non-invasive neuromodulatory technique that alters ongoing neural dynamics by injecting an exogenous electrical current through the scalp. Although tES protocols are becoming more common in both clinical and experimental settings, the neurophysiological mechanisms through which tES modulates cortical dynamics are unknown. Most existing tES protocols ignore the potential effect of phasic interactions between endogenous and exogenous currents by stimulating in an open-looped fashion. To better understand the mechanisms of closed-loop tES, we first instantiated a two-column Jansen and Rit model to simulate neuronal dynamics of pyramidal cells and interneurons. An echo-state network (ESN) reservoir computer inverted the dynamics of the model without access to the internal state equations. After inverting the model dynamics, the ESN was used as a closed-loop feedback controller for the neural mass model by predicting the current stimulation input for a desired future output. The ESN was used to predict the endogenous membrane currents of the model from the observable pyramidal cell membrane potentials and then inject current stimulation to destructively interfere with endogenous membrane currents, thereby reducing the energy of the PCs. This simulation approach provides a framework for a model-free closed-loop feedback controller in tES experiments.

show abstract

Intermittent tACS during a visual task impacts neural oscillations and LZW complexity

Cited by 4 publications

References 54 publications

Effects of Transcranial Alternating Current Stimulation and Neurofeedback on Alpha (EEG) Dynamics: A Review

Effects of Transcranial Alternating Current Stimulation and Neurofeedback on Alpha (EEG) Dynamics: A Review

Transcranial Alternating Current Stimulation to Modulate Alpha Activity: A Systematic Review

Closed-Loop Current Stimulation Feedback Control of a Neural Mass Model Using Reservoir Computing

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