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Bihemispheric network dynamics coordinating vocal feedback control.

Naomi S Kort1, Pablo Cuesta2, John F Houde3

  • 1Department of Psychiatry, SFVAMC 116-D, Building 8, 4150 Clement St, San Francisco, California.

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Summary
This summary is machine-generated.

Neural activity in the brain

Keywords:
functional neuroimagingmagnetoencephalographyphonationsensorimotor cortexsensory-motor performancespeech

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Area of Science:

  • Neuroscience
  • Speech Science
  • Auditory Feedback Research

Background:

  • Vocal pitch modulation is crucial for conveying linguistic and affective information.
  • Auditory feedback is essential for monitoring and regulating vocal pitch.
  • Neural mechanisms underlying pitch control are not fully understood.

Purpose of the Study:

  • To investigate neural high gamma power (HGP) changes during vocal pitch feedback control.
  • To identify brain regions involved in processing pitch shifts and motor adjustments.
  • To elucidate the role of sensorimotor networks in vocal pitch regulation.

Main Methods:

  • Magnetoencephalography (MEG) was used to measure neural activity.
  • Participants phonated while receiving real-time pitch-shifted auditory feedback.
  • Cortical responses during passive listening were subtracted to isolate speech production activity.

Main Results:

  • Increased HGP was observed bilaterally within 200 ms of pitch shifts, involving sensory and motor regions.
  • Later responses (200-300 ms) were right-dominant in parietal, frontal, and temporal areas.
  • Specific regions like the right parietal, premotor, and left posterior temporal cortex were implicated in motor responses.

Conclusions:

  • The study highlights a bihemispheric sensorimotor cortical network for auditory feedback-based vocal pitch control.
  • Neural activity patterns correlate with behavioral compensation, indicating roles in sensory processing and motor planning.
  • Findings provide insights into the neural basis of speech production and adaptation.