Neural Correlates of Vocal Repertoire in Primates

Frontiers in Neuroscience
Jacob C Dunn, Jeroen B Smaers

Abstract

Understanding the nature of the relationship between vocal complexity and brain architecture across non-human primates may help elucidate some of the key elements underlying the evolution of human speech. Here, we report a positive correlation between vocal repertoire size and the relative size of cortical association areas (governing voluntary control over behavioural output) in non-human primates. We further demonstrate that a hominid grade shift in the relative volume of cortical association areas coincides with a similar grade shift in the hypoglossal nucleus (which is associated with the cranial nerve that innervates the muscles of the tongue). Our results support a qualitative continuity in the neural correlates of vocal repertoire, but a quantitative discontinuity in the extent to which the neural system supporting speech is innervated by cortical association areas in great apes and humans.

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Citations

Aug 12, 2020·PLoS Biology·Daniel L BowlingW Tecumseh Fitch
Jun 17, 2020·Proceedings of the National Academy of Sciences of the United States of America·Denis ArchakovJosef P Rauschecker
Aug 6, 2021·Royal Society Open Science·Eithne KavanaghKatie Slocombe
Jan 16, 2022·Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft·Shin-Ichi IwasakiSerkan Erdoğan

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