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Related Experiment Videos

Cortical potentials associated with vocalization in the rhesus monkey.

J Szirtes, M Marton, J Urbán

    Acta Physiologica Academiae Scientiarum Hungaricae
    |January 1, 1977
    PubMed
    Summary

    Researchers studied cortical potentials in rhesus monkeys before vocalization. A slow negative potential shift was observed, potentially representing an early stage of voluntary speech control in humans.

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    Area of Science:

    • Neuroscience
    • Primatology
    • Comparative Cognition

    Background:

    • Vocalization in non-human primates offers insights into the evolution of complex communication.
    • Understanding the neural underpinnings of vocal control is crucial for evolutionary biology.

    Purpose of the Study:

    • To investigate cortical electrical activity preceding vocalization in rhesus monkeys.
    • To explore potential neural precursors to voluntary vocal control.

    Main Methods:

    • Transcranial recordings were performed on two rhesus monkeys.
    • Electrical potentials in precentral cortical areas were analyzed in relation to vocalization onset.

    Main Results:

    • A consistent slow negative potential shift was detected approximately one second before vocalization.
    • This pre-vocalization potential was observed in the precentral cortical regions.

    Conclusions:

    • The observed slow potential shift may represent a homologous or analogous neural mechanism to human speech control.
    • This finding suggests a potential phylogenetic link between primate vocalization control and human speech evolution.

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