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Resting-state functional connectivity changes following audio-tactile speech training.

Katarzyna Cieśla1,2,3, Tomasz Wolak3, Amir Amedi1,2

  • 1The Baruch Ivcher Institute for Brain, Cognition, and Technology, The Baruch Ivcher School of Psychology, Reichman University, Herzliya, Israel.

Frontiers in Neuroscience
|May 14, 2025
PubMed
Summary
This summary is machine-generated.

Audio-tactile speech training enhances brain connectivity for speech comprehension. This multisensory approach improves how the brain processes sound and touch, offering potential benefits for hearing rehabilitation.

Keywords:
cochlear implantsfMRImultisensory trainingresting-state functional MRIspeech comprehensiontactile aid

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Multisensory Integration

Background:

  • Speech comprehension in noise is difficult, especially with distorted signals.
  • Previous studies show tactile speech signals improve auditory comprehension.
  • Audio-tactile speech training further enhances this effect.

Purpose of the Study:

  • To investigate training-induced changes in brain functional connectivity using resting-state fMRI.
  • To understand the neural mechanisms underlying tactile speech benefits.
  • To explore potential applications in hearing rehabilitation.

Main Methods:

  • Used resting-state functional magnetic resonance imaging (rsfMRI).
  • Measured spontaneous low-frequency brain oscillations at rest.
  • Assessed changes in functional connectivity (FC) before and after audio-tactile speech training.

Main Results:

  • Enhanced FC in right-hemisphere areas (MT, EBA, LOC) connected to the insula.
  • Early visual areas shifted connectivity from auditory cortex to a parietal hub post-training.
  • Increased internal connectivity within the right sensorimotor cortex, including finger areas.

Conclusions:

  • Training leverages pre-existing audio-visual speech networks and enhances spatial/body awareness for audio-tactile integration.
  • Results suggest novel multisensory pathways are formed, potentially requiring extended training.
  • Findings advance understanding of tactile speech benefits for comprehension and hearing impairment rehabilitation.