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Related Experiment Videos

Respiratory muscle activity during vocalization in the squirrel monkey.

U Jürgens1, S Schriever

  • 1Max-Planck-Institut für Psychiatrie, München, BRD.

Folia Primatologica; International Journal of Primatology
|January 1, 1991
PubMed
Summary

Researchers investigated primate phonation by recording 17 abdominal and thoracic muscles in squirrel monkeys during vocalization. Findings reveal specific muscles stabilize the thorax for vocalization, rather than solely aiding exhalation.

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Area of Science:

  • Comparative Anatomy
  • Animal Behavior
  • Physiology

Background:

  • Primate phonation involves complex respiratory muscle coordination.
  • Understanding these mechanisms is crucial for studying vocal communication evolution.

Purpose of the Study:

  • To identify specific muscles involved in the respiratory component of primate vocalization.
  • To elucidate the functional role of thoracic and abdominal muscles during phonation.

Main Methods:

  • Electromyography was used to record the activity of 17 abdominal and thoracic muscles.
  • Muscle activity was measured during vocalization in squirrel monkeys.

Main Results:

  • Vocalization-correlated activity was observed in external oblique, internal oblique, rectus abdominis, transversus abdominis, external intercostal, internal intercostal, and intercartilagineus muscles.

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  • Muscles such as iliocostalis, latissimus dorsi, and pectoralis major showed no vocalization-correlated activity.
  • Simultaneous activation of external (rib-raising) and internal (rib-lowering) intercostals occurred during most vocalizations.

    • Conclusions:

    • The intercostal muscles primarily function to stabilize the thorax during primate vocalization.
    • This thoracic stabilization provides an anchor for abdominal muscles to act against during phonation.