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Related Experiment Video

Updated: Apr 29, 2026

Transcranial Direct Current Stimulation tDCS of Wernicke's and Broca's Areas in Studies of Language Learning and Word Acquisition
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Dynamic, minimally invasive electrical brain stimulation improves speech perception.

Serdar Akkol1, Jose L Herrero2, Elizabeth Espinal3

  • 1The Feinstein Institutes for Medical Research, Northwell Health, Manhasset, NY, United States; Elmezzi Graduate School of Molecular Medicine at Northwell Health, Manhasset, NY, United States.

Hearing Research
|April 27, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a new minimally-invasive electrical brain stimulation (EBS) method to enhance speech perception. The novel approach improved accuracy in most sessions, showing potential for dynamic auditory processing enhancement.

Keywords:
Auditory response latencyCranial boltsEpicranial electrodesMatrix sentence speech in noise task

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Auditory Perception

Background:

  • Electrical brain stimulation (EBS) is explored for improving speech perception.
  • Current noninvasive EBS methods lack precision and temporal specificity.
  • Minimally-invasive approaches are needed to overcome limitations of transcranial stimulation.

Purpose of the Study:

  • To introduce and evaluate a novel minimally-invasive EBS technique using epicranial electrodes and cranial bolts.
  • To investigate the effect of dynamic EBS patterns on speech perception in noise.
  • To assess the efficacy of different stimulation latencies (50 ms and 200 ms) on speech perception accuracy.

Main Methods:

  • Utilized clinically implanted epicranial electrodes and cranial bolts in five epilepsy patients.
  • Patients performed a speech-in-noise task under three conditions: no stimulation, 50 ms, and 200 ms stimulation lag.
  • Employed amplitude-modulated, biphasic, 100 Hz square-wave pulses, with amplitude dynamically adjusted to the speech envelope.

Main Results:

  • Speech perception accuracy improved in 5 out of 6 sessions.
  • A significant improvement was observed with a 50 ms stimulation delay in 5/6 sessions.
  • Further improvement was noted with a 200 ms delay in 3/5 sessions showing initial improvement.
  • Responder rates for improved speech perception were 83% for 50 ms and 50% for 200 ms delay.

Conclusions:

  • Minimally-invasive EBS with epicranial electrodes is feasible for dynamic modulation of speech perception.
  • The novel approach circumvents shunting limitations of transcranial stimulation.
  • Dynamic EBS shows promise for enhancing auditory processing, with varying efficacy based on stimulation latency.