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Related Experiment Videos

Auditory response following vocalization: a magnetoencephalographic study.

A Gunji1, M Hoshiyama, R Kakigi

  • 1Department of Integrative Physiology, National Institute for Physiological Sciences, Myodaiji, 444-8585, Okazaki, Japan. agunji@nips.ac.jp

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|February 27, 2001
PubMed
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Researchers identified the auditory component of vocalization-related cortical fields (VRCF) by masking a subject's own voice. This auditory feedback process, crucial after vocalization onset, activates areas similar to external sound processing.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Speech Processing

Background:

  • Vocalization-related cortical fields (VRCF) are complex neural responses.
  • Understanding the auditory component of self-produced vocalizations is challenging due to simultaneous vocalization and auditory feedback.
  • Previous research has not fully isolated the auditory feedback response within the VRCF complex.

Purpose of the Study:

  • To identify and isolate the auditory component evoked by a subject's own voice within the VRCF complex.
  • To differentiate the neural activity related to vocalization production from auditory feedback.
  • To investigate the timing and location of auditory feedback processing in the brain.

Main Methods:

  • Recorded VRCF in 10 healthy volunteers during vowel (/u/) vocalization under two conditions: no masking (control) and masking with weighted-white noise.

Related Experiment Videos

  • Recorded auditory evoked magnetic fields (AEF) following speech sound stimulation in a separate experiment.
  • Analyzed the difference waveform (masking minus control) to isolate the auditory feedback response (1M component).

    • Main Results:

    • VRCF onset occurred before vocalization onset, with a distinct phase-reversed deflection after vocalization.
    • A significant deflection (1M) was observed at 81.3 ms after vocalization onset in the difference waveform.
    • The 1M component's equivalent current dipole was localized in the auditory cortex, similar to the M100 component of AEF (94.3 ms).

    Conclusions:

    • Auditory feedback response was successfully separated from the VRCF complex using voice masking.
    • The masking technique proved crucial for isolating the auditory feedback process occurring after vocalization onset.
    • The 1M component likely represents auditory feedback from the subject's own voice, activating auditory areas similar to those for external sounds.