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Modulation of Illusory Auditory Perception by Transcranial Electrical Stimulation.

Giulia Prete1, Anita D'Anselmo1, Luca Tommasi1

  • 1Department of Psychological Science, Health and Territory, Università degli Studi "G. d'Annunzio" Chieti - PescaraChieti, Italy.

Frontiers in Neuroscience
|July 6, 2017
PubMed
Summary

High-frequency transcranial Random Noise Stimulation (hf-tRNS) effectively modulated auditory illusions, unlike transcranial Direct Current Stimulation (tDCS). This finding highlights hf-tRNS as a promising tool for influencing auditory perception and illusions.

Keywords:
Deutsch's illusionacoustic stimuliauditory cortextranscranial direct current stimulation (tDCS)transcranial random noise stimulation (tRNS)

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Sensory Illusions

Background:

  • Auditory illusions, such as the Deutsch's illusion, demonstrate the brain's active role in constructing auditory perception.
  • Transcranial electrical stimulation techniques offer non-invasive methods to probe and modulate neural activity.

Purpose of the Study:

  • To investigate the efficacy of transcranial Direct Current Stimulation (tDCS) and high-frequency transcranial Random Noise Stimulation (hf-tRNS) in modulating the Deutsch's auditory illusion.
  • To compare the effects of tDCS and hf-tRNS on illusory auditory perception.

Main Methods:

  • Two experiments were conducted applying tDCS (anodal/cathodal) and hf-tRNS to the temporal cortex during the Deutsch's illusion paradigm.
  • Participants (N=60 for tDCS, N=45 for hf-tRNS) were exposed to dichotically alternating tones designed to elicit the illusion.
  • Sham stimulation served as a control condition for both stimulation types.

Main Results:

  • Neither anodal nor cathodal tDCS over the temporal cortex significantly altered the perception of the Deutsch's illusion.
  • hf-tRNS applied bilaterally to the temporal cortex significantly reduced the occurrence of the Deutsch's illusion compared to sham stimulation.
  • The duration of stimulation (5 or 15 minutes) did not impact the perceptual modulation by hf-tRNS.

Conclusions:

  • hf-tRNS is more effective than tDCS in modulating auditory perception, specifically reducing the incidence of the Deutsch's illusion.
  • These findings suggest that hf-tRNS can be a valuable tool for investigating and potentially influencing auditory processing and sensory illusions.