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40Hz-Transcranial alternating current stimulation (tACS) selectively modulates speech perception.

Katharina S Rufener1, Tino Zaehle2, Mathias S Oechslin3

  • 1Research Unit for Neuroplasticity and Learning of the Healthy Aging Brain, University of Zurich, Switzerland; Department of Neurology, Otto-von-Guericke University Magdeburg, Germany.

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|January 19, 2016
PubMed
Summary

Forty Hertz transcranial alternating current stimulation (tACS) selectively impaired speech perception learning. This finding suggests gamma oscillations are crucial for processing acoustic speech features and may offer new therapeutic avenues.

Keywords:
Perceptual learningPhoneme processingTranscranial alternating current stimulation

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Speech Processing

Background:

  • Gamma oscillations are implicated in cognitive functions.
  • Understanding their role in speech perception is crucial for addressing related disorders.

Purpose of the Study:

  • To investigate the functional relevance of gamma oscillations in processing rapid acoustic speech features.
  • To examine the effects of transcranial alternating current stimulation (tACS) on speech perception learning.

Main Methods:

  • 18 healthy adults performed a phoneme categorization task.
  • Participants received 6Hz or 40Hz tACS over the auditory cortex.
  • Repetition-induced perceptual learning effects were analyzed.

Main Results:

  • 40Hz tACS selectively attenuated repetition-induced improvements in phoneme categorization.
  • 6Hz tACS and no stimulation showed considerable perceptual performance improvement.
  • Short-duration tACS below perceptual threshold affected speech perception.

Conclusions:

  • Gamma oscillations are functionally relevant for perceptual learning of acoustic speech features.
  • Non-invasive brain stimulation can modulate speech perception.
  • This approach may benefit individuals with impaired speech processing, such as dyslexics and older adults.