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Related Experiment Videos

Speaking modifies voice-evoked activity in the human auditory cortex.

G Curio1, G Neuloh, J Numminen

  • 1Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland. curio@zedat.fu-berlin.de

Human Brain Mapping
|April 19, 2000
PubMed
Summary

Speaking primes the auditory cortex, delaying responses to self-produced sounds, especially in the dominant hemisphere. This auditory self-monitoring mechanism may be impaired in speech disorders.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Speech Production

Background:

  • Proper audiovocal interaction is crucial for spoken language.
  • Dysfunctional audiovocal interactions are linked to aphasia, stuttering, and voice hallucinations.
  • Noninvasive methods to assess auditory self-monitoring of speech are limited.

Purpose of the Study:

  • To investigate the neural mechanisms of auditory self-monitoring during speech.
  • To examine how the brain processes self-produced sounds compared to external sounds.
  • To explore potential deficits in auditory self-monitoring in speech disorders.

Main Methods:

  • Magnetoencephalography (MEG) was used to measure brain activity.
  • Participants spoke syllables and listened to recordings of their own speech.

Related Experiment Videos

  • Auditory cortex responses to expected and unexpected auditory stimuli were analyzed.

    • Main Results:

    • Self-uttered syllables activated the speaker's auditory cortex approximately 100 ms after voice onset.
    • Auditory responses were delayed in the left hemisphere compared to the right during self-utterance, but symmetric during listening.
    • The auditory cortex showed reduced responses to unexpected vowel changes during repetitive speech compared to listening.

    Conclusions:

    • Speaking primes the auditory cortex, dampening and delaying responses to expected self-produced sounds.
    • This motor-to-sensory priming effect is more pronounced in the speech-dominant hemisphere.
    • Compromised auditory self-monitoring mechanisms in the early auditory cortex may contribute to central speech disorders.