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Alpha transcranial alternating current stimulation modulates auditory perception.

Sreekari Vogeti1, Maryam Faramarzi1, Christoph S Herrmann2

  • 1Experimental Psychology Lab, Department of Psychology, European Medical School, Cluster for Excellence "Hearing for All", Carl von Ossietzky University, Oldenburg, Germany.

Brain Stimulation
|November 10, 2023
PubMed
Summary
This summary is machine-generated.

Alpha transcranial alternating current stimulation (tACS) enhances auditory perception, unlike delta stimulation or polarity alone. This non-invasive brain stimulation technique specifically modulates how we perceive near-threshold sounds.

Keywords:
Entrainment(3)Hearing(4)Oscillations(2)Perception(5)Phase modulation(6)Transcranial alternating current stimulation (tACS)(1)

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Brain Stimulation

Background:

  • Non-invasive brain stimulation, specifically transcranial alternating current stimulation (tACS), has shown links between alpha and delta/theta oscillations and auditory perception.
  • Previous studies have not directly compared the effects of different oscillation phases and frequencies on auditory perception.
  • The role of polarity, independent of frequency, in modulating auditory perception remains unclear.

Purpose of the Study:

  • To investigate whether auditory perception is influenced by the phase of alpha oscillations, delta/theta oscillations, or by polarity alone.
  • To compare the effects of alpha tACS, delta tACS, and direct current (DC) stimulation on near-threshold auditory perception.
  • To determine if stimulation polarity independently affects auditory perception.

Main Methods:

  • Participants underwent alpha, delta, and DC stimulation, as well as a sham condition, over temporal and central scalp sites.
  • Auditory perception was assessed by identifying near-threshold tones-in-noise.
  • Statistical analyses included repeated-measures ANOVA and permutation-based circular-logistic regressions to evaluate the impact of stimulation conditions and polarity on performance.

Main Results:

  • A significantly higher proportion of correct identifications (hits) was observed during alpha tACS compared to delta, DC, and sham conditions.
  • An interaction between polarity and stimulation condition was found, with enhanced perception during the positive phase of alpha tACS.
  • No significant effects on auditory perception were found for delta tACS, DC stimulation, or polarity alone, although exploratory analysis indicated alpha stimulation's circular predictors significantly explained behavioral data.

Conclusions:

  • Alpha tACS, but not delta tACS or polarity alone, significantly modulates auditory perception.
  • The findings highlight the specific role of alpha oscillations in auditory processing.
  • This research provides insights into optimizing non-invasive brain stimulation for auditory perception enhancement.