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The cingular vocalization pathway in the squirrel monkey.

U Jürgens, R Pratt

    Experimental Brain Research
    |February 15, 1979
    PubMed
    Summary
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    Researchers mapped the neural pathway for vocalizations originating in the squirrel monkey

    Area of Science:

    • Neuroscience
    • Primatology
    • Vocalization Research

    Background:

    • Vocalizations are crucial for animal communication.
    • The neural basis of vocal production is complex and not fully understood.
    • The anterior cingulate gyrus is implicated in vocal control.

    Purpose of the Study:

    • To determine the complete neural pathway for vocalizations elicited from the squirrel monkey's precallosal cingulate gyrus.
    • To investigate the role of the anterior cingulate gyrus in vocal control.

    Main Methods:

    • Lesion studies in 39 squirrel monkeys (Saimiri sciureus).
    • Electrical stimulation of the precallosal cingulate gyrus.
    • Tracing lesion pathways to laryngeal motoneurons.
    • Testing effects of anterior cingular lesions on vocalizations from other brain areas.

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    Main Results:

    • A continuous pathway for "cingular vocalization" was traced from the precallosal cingulate gyrus to the nucleus ambiguus.
    • This pathway involves the frontal white matter, internal capsule, periaqueductal gray, parabrachial area, pons, and medulla.
    • Bilateral anterior cingular lesions abolished vocalizations elicited from the postero-medial orbital cortex, but not other areas.

    Conclusions:

    • The study elucidates a specific descending motor pathway for vocalization control originating in the anterior cingulate cortex.
    • This pathway highlights the critical role of the anterior cingulate gyrus in vocal production and its connection to laryngeal motoneurons.
    • The anterior cingulate gyrus exerts control over specific vocalization-eliciting areas, such as the postero-medial orbital cortex.