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Cortical Alpha Oscillations Predict Speech Intelligibility.

Andrew Dimitrijevic1, Michael L Smith2, Darren S Kadis3

  • 1Otolaryngology-Head and Neck Surgery, Sunnybrook Health Sciences CentreToronto, ON, Canada; Hurvitz Brain Sciences, Evaluative Clinical Sciences, Sunnybrook Research InstituteToronto, ON, Canada; Faculty of Medicine, Otolaryngology-Head and Neck SurgeryUniversity of Toronto, Toronto, ON, Canada.

Frontiers in Human Neuroscience
|March 14, 2017
PubMed
Summary
This summary is machine-generated.

Brain alpha oscillations are key to understanding speech in noise. This study found temporal alpha event-related desynchronization (ERD) correlated with correct speech perception in challenging listening conditions.

Keywords:
EEGattentionbraindigits in noisehearingspeech in noise

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cognitive Neuroscience

Background:

  • Speech-in-noise (SiN) perception relies on sensory and cognitive functions like attention and working memory.
  • Alpha brain rhythms (8-12 Hz) are implicated in sensory processing, attention, and working memory.
  • Limited research exists on brain oscillations during continuous speech perception tasks.

Purpose of the Study:

  • To investigate cortical alpha oscillations during attentive listening in a digits-in-noise (DiN) task.
  • To understand the neural mechanisms of top-down cognitive processing in adverse auditory environments.
  • To compare brain activity during active (DiN listening) versus passive (video attention) tasks.

Main Methods:

  • 14 normal-hearing young adults participated.
  • Speech reception threshold (SRT) for the DiN task was behaviorally assessed.
  • Electroencephalography (EEG) recorded brain activity during two conditions: active DiN listening near SRT and passive attention to a silent video with ignored digit stimuli.

Main Results:

  • Distinct neural oscillations (alpha and beta) were observed during active DiN listening, but not during passive video attention.
  • Alpha event-related synchronization (ERS) in central/parietal regions and alpha event-related desynchronization (ERD) in temporal regions were noted during active listening.
  • Temporal alpha ERD was significantly greater on correctly identified digit trials, while central/parietal alpha ERS showed no such consistency.

Conclusions:

  • Alpha brain activity changes are specific to listening conditions, differentiating active from passive tasks.
  • This is the first study to report minimal brain oscillatory changes during a passive task compared to an active one.
  • Temporal alpha ERD is a neural correlate of successful speech perception in noise.