Which way to the dawn of speech?: Reanalyzing half a century of debates and data in light of speech science

Abstract

Recent articles on primate articulatory abilities are revolutionary regarding speech emergence, a crucial aspect of language evolution, by revealing a human-like system of proto-vowels in nonhuman primates and implicitly throughout our hominid ancestry. This article presents both a schematic history and the state of the art in primate vocalization research and its importance for speech emergence. Recent speech research advances allowmore incisive comparison of phylogeny and ontogeny and also an illuminating reinterpretation of vintage primate vocalization data. This review produces three major findings. First, even among primates, laryngeal descent is not uniquely human. Second, laryngeal descent is not required to produce contrasting formant patterns in vocalizations. Third, living nonhuman primates produce vocalizations with contrasting formant patterns. Thus, evidence now overwhelmingly refutes the long-standing laryngeal descent theory, which pushes back "the dawn of speech" beyond similar to 200 ka ago to over similar to 20 Ma ago, a difference of two orders of magnitude.

Description
Keywords
MONKEYS CERCOPITHECUS-AETHIOPS, VERTEBRATE VOCAL PRODUCTION, TRACT AREA FUNCTIONS, HUMANS HOMO-SAPIENS, ACOUSTIC FEATURES, BODY-SIZE, VERVET MONKEYS, RHESUS-MONKEY, ALARM CALLS, GRUNT VOCALIZATIONS, Multidisciplinary Sciences
Citation
Boë, L.-J., Sawallis, T. R., Fagot, J., Badin, P., Barbier, G., Captier, G., Ménard, L., Heim, J.-L., & Schwartz, J.-L. (2019). Which way to the dawn of speech?: Reanalyzing half a century of debates and data in light of speech science. In Science Advances (Vol. 5, Issue 12). American Association for the Advancement of Science (AAAS). https://doi.org/10.1126/sciadv.aaw3916