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Related Experiment Videos

Cortical field potentials preceding vocalization in monkeys

H Gemba1, N Miki, K Sasaki

  • 1Department of Physiology, Kansai Medical University, Moriguchi, Japan. gemba@takii.kmu.ac.jp

Acta Oto-Laryngologica. Supplementum
|January 1, 1997
PubMed
Summary
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This study reveals that specific brain areas, including the premotor cortex, are involved in monkey vocalization control. Cerebellar hemispherectomy impacted vocalization, suggesting cerebro-cerebellar interactions are crucial for sound generation.

Area of Science:

  • Neuroscience
  • Primate Behavior
  • Vocalization Research

Background:

  • Animal vocalization is generally considered fundamentally different from human speech.
  • The neural mechanisms underlying primate vocalization are not fully understood.

Purpose of the Study:

  • To investigate the neural correlates of vocalization in monkeys.
  • To explore the role of specific cortical areas and the cerebellum in vocal control.

Main Methods:

  • Chronic electrode implantation on the surface and at depth in various cortical areas of three monkeys.
  • Recording of slow potentials (surface-negative, depth-positive) before vocalization.
  • Assessment of vocalization changes after cerebellar hemispherectomy.

Main Results:

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  • Pre-vocalization potentials were observed in premotor, motor, somatosensory cortices, supplementary motor area, cingulate, and prefrontal cortices.
  • Cerebellar hemispherectomy eliminated these potentials in the motor cortex and Broca's area homolog.
  • Post-surgery, vocalizations showed reduced frequency components and increased duration variability.

Conclusions:

  • The neocortical area homologous to human speech plays a role in monkey vocalization.
  • Cerebro-cerebellar interactions are likely involved in the generation and control of vocalizations.
  • Primate vocalization may share more similarities with human speech than previously thought.