Effects of Transcranial Electrical Stimulation on Human Auditory Processing and Behavior—A Review

Wang, Yao; Shi, Limeng; Dong, Gaoyuan; Zhang, Zuoying; Chen, Ruijuan

doi:10.3390/brainsci10080531

Cited by 15 publications

(17 citation statements)

References 122 publications

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“…These studies found that the tACS did modulate speech comprehension, but that the best and worst phase shifts were highly variable between subjects (Riecke et al, 2018;Zoefel, Archer-Boyd and Davis, 2018). Similarly, related work on temporal delays between the sound and the neurostimulation waveform found large variability between subjects, and in one case no significant effect on the population level (Riecke et al, 2018;Wilsch et al, 2018;Erkens et al, 2020;Wang et al, 2020). In our previous work on the role of phase shifts in tACS with the speech envelope we employed, as in this study, natural speech in which syllables did not occur at a single fixed frequency and found a phase dependency of the resulting speech comprehension that was largely consistent across the different subjects.…”

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confidence: 90%

Cortical Tracking of a Background Speaker Modulates the Comprehension of a Foreground Speech Signal

2021

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confidence: 90%

Cortical Tracking of a Background Speaker Modulates the Comprehension of a Foreground Speech Signal

2021

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“…Each subject would undergo these three stimulation protocols in a randomized order. Meanwhile, the stimulation conditions were performed with a wash-off period of at least one week between each other [ 21 ].…”

Section: Methodsmentioning

confidence: 99%

The Effects of 10 Hz and 20 Hz tACS in Network Integration and Segregation in Chronic Stroke: A Graph Theoretical fMRI Study

et al. 2021

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Transcranial alternating current stimulation (tACS) has emerged as a promising technique to non-invasively modulate the endogenous oscillations in the human brain. Despite its clinical potential to be applied in routine rehabilitation therapies, the underlying modulation mechanism has not been thoroughly understood, especially for patients with neurological disorders, including stroke. In this study, we aimed to investigate the frequency-specific stimulation effect of tACS in chronic stroke. Thirteen chronic stroke patients underwent tACS intervention, while resting-state functional magnetic resonance imaging (fMRI) data were collected under various frequencies (sham, 10 Hz and 20 Hz). The graph theoretical analysis indicated that 20 Hz tACS might facilitate local segregation in motor-related regions and global integration at the whole-brain level. However, 10 Hz was only observed to increase the segregation from whole-brain level. Additionally, it is also observed that, for the network in motor-related regions, the nodal clustering characteristic was decreased after 10 Hz tACS, but increased after 20 Hz tACS . Taken together, our results suggested that tACS in various frequencies might induce heterogeneous modulation effects in lesioned brains. Specifically, 20 Hz tACS might induce more modulation effects, especially in motor-related regions, and they have the potential to be applied in rehabilitation therapies to facilitate neuromodulation. Our findings might shed light on the mechanism of neural responses to tACS and facilitate effectively designing stimulation protocols with tACS in stroke in the future.

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“…The copyright holder for this preprint this version posted April 12, 2021. ; https://doi.org/10.1101/2021.04.12.439458 doi: bioRxiv preprint worst phase shifts were highly variable between subjects (Riecke et al, 2018;Zoefel, Archer-Boyd and Davis, 2018). Similarly, related work on temporal delays between the sound and the neurostimulation waveform found large variability between subjects, and in one case no significant effect on the population level (Riecke et al, 2018;Wilsch et al, 2018;Erkens et al, 2020;Wang et al, 2020). In our previous work on the role of phase shifts in tACS with the speech envelope we employed, as in this study, natural speech in which syllables did not occur at a single fixed frequency and found a phase dependency of the resulting speech comprehension that was largely consistent across the different subjects.…”

Section: Multiple Linear Regressionmentioning

confidence: 99%

Cortical tracking of a background speaker modulates the comprehension of a foreground speech signal

Keshavarzi

Varano

Reichenbach

2021

Preprint

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Understanding speech in background noise is a difficult task. The tracking of speech rhythms such as the rate of syllables and words by cortical activity has emerged as a key neural mechanism for speech-in-noise comprehension. In particular, recent investigations have used transcranial alternating current stimulation (tACS) with the envelope of a speech signal to influence the cortical speech tracking, demonstrating that this type of stimulation modulates comprehension and therefore evidencing a functional role of the cortical tracking in speech processing. Cortical activity has been found to track the rhythms of a background speaker as well, but the functional significance of this neural response remains unclear. Here we employ a speech-comprehension task with a target speaker in the presence of a distractor voice to show that tACS with the speech envelope of the target voice as well as tACS with the envelope of the distractor speaker both modulate the comprehension of the target speech. Because the envelope of the distractor speech does not carry information about the target speech stream, the modulation of speech comprehension through tACS with this envelope evidences that the cortical tracking of the background speaker affects the comprehension of the foreground speech signal. The phase dependency of the resulting modulation of speech comprehension is, however, opposite to that obtained from tACS with the envelope of the target speech signal. This suggests that the cortical tracking of the ignored speech stream and that of the attended speech stream may compete for neural resources.

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Effects of Transcranial Electrical Stimulation on Human Auditory Processing and Behavior—A Review

Cited by 15 publications

References 122 publications

Cortical Tracking of a Background Speaker Modulates the Comprehension of a Foreground Speech Signal

Cortical Tracking of a Background Speaker Modulates the Comprehension of a Foreground Speech Signal

The Effects of 10 Hz and 20 Hz tACS in Network Integration and Segregation in Chronic Stroke: A Graph Theoretical fMRI Study

Cortical tracking of a background speaker modulates the comprehension of a foreground speech signal

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