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Schruth DM, Templeton CN, Holman DJ. On reappearance and complexity in musical calling. PLoS One. 2021;16(12):e0218006doi: 10.1371/journal.pone.0218006.
Schruth, D. M., Templeton, C. N., & Holman, D. J. (2021). On reappearance and complexity in musical calling. PloS one, 16(12), e0218006. https://doi.org/10.1371/journal.pone.0218006
Schruth, David M, et al. "On reappearance and complexity in musical calling." PloS one vol. 16,12 (2021): e0218006. doi: https://doi.org/10.1371/journal.pone.0218006
Schruth DM, Templeton CN, Holman DJ. On reappearance and complexity in musical calling. PLoS One. 2021 Dec 17;16(12):e0218006. doi: 10.1371/journal.pone.0218006. eCollection 2021. PMID: 34919558; PMCID: PMC8683036.
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PLoS One. 2021 Dec 17;16(12):e0218006. doi: 10.1371/journal.pone.0218006. eCollection 2021.

On reappearance and complexity in musical calling.

PloS one

David M Schruth, Christopher N Templeton, Darryl J Holman

Affiliations

  1. Department of Anthropology, University of Washington, Seattle, Washington, United States of America.
  2. Department of Biology, Pacific University, Forest Grove, Oregon, United States of America.

PMID: 34919558 PMCID: PMC8683036 DOI: 10.1371/journal.pone.0218006

Abstract

Music is especially valued in human societies, but music-like behavior in the form of song also occurs in a variety of other animal groups including primates. The calling of our primate ancestors may well have evolved into the music of modern humans via multiple selective scenarios. But efforts to uncover these influences have been hindered by the challenge of precisely defining musical behavior in a way that could be more generally applied across species. We propose an acoustic focused reconsideration of "musicality" that could help enable independent inquiry into potential ecological pressures on the evolutionary emergence of such behavior. Using published spectrographic images (n = 832 vocalizations) from the primate vocalization literature, we developed a quantitative formulation that could be used to help recognize signatures of human-like musicality in the acoustic displays of other species. We visually scored each spectrogram along six structural features from human music-tone, interval, transposition, repetition, rhythm, and syllabic variation-and reduced this multivariate assessment into a concise measure of musical patterning, as informed by principal components analysis. The resulting acoustic reappearance diversity index (ARDI) estimates the number of different reappearing syllables within a call type. ARDI is in concordance with traditional measures of bird song complexity yet more readily identifies shorter, more subtly melodic primate vocalizations. We demonstrate the potential utility of this index by using it to corroborate several origins scenarios. When comparing ARDI scores with ecological features, our data suggest that vocalizations with diversely reappearing elements have a pronounced association with both social and environmental factors. Musical calls were moderately associated with wooded habitats and arboreal foraging, providing partial support for the acoustic adaptation hypothesis. But musical calling was most strongly associated with social monogamy, suggestive of selection for constituents of small family-sized groups by neighboring conspecifics. In sum, ARDI helps construe musical behavior along a continuum, accommodates non-human musicality, and enables gradualistic co-evolutionary paths between primate taxa-ranging from the more inhibited locational calls of archaic primates to the more exhibitional displays of modern apes.

Conflict of interest statement

The authors have declared that no competing interests exist.

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