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Processing of auditory feedback in perisylvian and insular cortex.

Garret Lynn Kurteff1, Alyssa M Field1, Saman Asghar1,2

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During speech production, the brain selectively suppresses auditory onset responses in the auditory cortex, while the posterior insula integrates multisensory feedback for speech control.

Keywords:
auditory perceptionintracranial electrophysiologylanguagespeechspeech motor controlspeech production

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Speech Processing

Background:

  • Speech production involves motor control and auditory/sensory feedback.
  • Auditory responses are modulated during speech production versus perception.
  • The spatiotemporal dynamics of this modulation are not fully understood.

Purpose of the Study:

  • To investigate auditory response modulation during speech production.
  • To examine how speech production affects auditory processing in the brain.
  • To identify brain regions involved in auditory feedback control during speech.

Main Methods:

  • Recorded intracranial electroencephalography (iEEG) in 17 patients (pediatric, adolescent, adult) with epilepsy.
  • Patients performed a reading/listening task.
  • Analyzed neural responses to speech perception and production.

Main Results:

  • Identified onset and sustained speech responses in bilateral auditory cortex.
  • Observed selective suppression of onset responses during speech production compared to perception.
  • Found stable phonological feature tuning in suppressed electrodes.
  • Detected responses in the posterior insula during both speech perception and production onset.

Conclusions:

  • Speech production involves selective suppression of auditory onset responses in the auditory cortex.
  • Onset suppression may relate to predictive coding mechanisms in speech.
  • The posterior insula plays a role in multisensory integration for speech feedback control.