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Chimpanzees combine pant hoots with food calls into larger structures
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Chestnut-crowned babbler calls are composed of meaningless shared building blocks
Abstract: A core component of human language is its combinatorial sound system: meaningful signals are built from different combinations of meaningless sounds. Investigating whether nonhuman communication systems are also combinatorial is hampered by difficulties in identifying the extent to which vocalizations are constructed from shared, meaningless building blocks. Here we present an approach to circumvent this difficulty and show that a pair of functionally distinct chestnut-crowned babbler (Pomatostomus ruficeps) vocalizations can be decomposed into perceptibly distinct, meaningless entities that are shared across the 2 calls. Specifically, by focusing on the acoustic distinctiveness of sound elements using a habituation-discrimination paradigm on wild-caught babblers under standardized aviary conditions, we show that 2 multielement calls are composed of perceptibly distinct sounds that are reused in different arrangements across the 2 calls. Furthermore, and critically, we show that none of the 5 constituent elements elicits functionally relevant responses in receivers, indicating that the constituent sounds do not carry the meaning of the call and so are contextually meaningless. Our work, which allows combinatorial systems in animals to be more easily identified, suggests that animals can produce functionally distinct calls that are built in a way superficially reminiscent of the way that humans produce morphemes and words. The results reported lend credence to the recent idea that language’s combinatorial system may have been preceded by a superficial stage where signalers neither needed to be cognitively aware of the combinatorial strategy in place, nor of its building blocks.
Keyword: Biological Sciences
URL: http://www.ncbi.nlm.nih.gov/pubmed/31501336
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6765311/
https://doi.org/10.1073/pnas.1819513116
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3
Chestnut-crowned babbler calls are composed of meaningless shared building blocks
Engesser, Sabrina; Holub, Jennifer L.; O’Neill, Louis G.. - : National Academy of Sciences, 2019
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4
Multimodal communication and language origins : integrating gestures and vocalizations
Fröhlich, Marlen; Sievers, Christine; Townsend, Simon W.. - : Wiley-Blackwell Publishing, Inc., 2019
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5
Combinatoriality in the vocal systems of nonhuman animals
Engesser, Sabrina; Townsend, Simon W.. - : John Wiley & Sons Ltd., 2019
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6
From animal communication to linguistics and back: insight from combinatorial abilities in monkeys and birds
In: Origins of human language: continuities and splits with nonhuman primates ; https://hal-univ-rennes1.archives-ouvertes.fr/hal-01928023 ; Louis-Jean Boë; Joël Fagot; Pascal Perrier; Jean-Luc Schwartz. Origins of human language: continuities and splits with nonhuman primates, Peter Lang GmbH, 2018, Speech Production and Perception Vol. 4, 9783631737262 (2018)
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7
Compositionality in animals and humans
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8
Compositionality in animals and humans
Townsend, Simon W.; Engesser, Sabrina; Stoll, Sabine. - : Public Library of Science, 2018
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9
Internal acoustic structuring in pied babbler recruitment cries specifies the form of recruitment
Engesser, Sabrina; Ridley, Amanda R.; Manser, Marta B.. - : Oxford University Press, 2018
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10
Exorcising Grice's ghost : an empirical approach to studying intentional communication in animals
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11
From animal communication to linguistics and back : insight from combinatorial abilities in monkeys and birds
Townsend, Simon W.. - : Frankfurt am Main, 2017
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12
Exorcising Grice’s ghost : an empirical approach to studying intentional communication in animals
Townsend, Simon W.; Koski, Sonja E.; Byrne, Richard W.. - : Wiley-Blackwell Publishing, Inc., 2017
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13
Data from: Experimental evidence for phonemic contrasts in a nonhuman vocal system ...
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14
Exorcising Grice's ghost : an empirical approach to studying intentional communication in animals
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15
Meaningful call combinations and compositional processing in the Southern Pied Babbler
Engesser, Sabrina; Ridley, Amanda R.; Townsend, Simon W.. - : National Academy of Sciences, 2016
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16
Experimental Evidence for Phonemic Contrasts in a Nonhuman Vocal System
Engesser, Sabrina; Crane, Jodie M. S.; Savage, James L.. - : Public Library of Science, 2015
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Engesser et al. Dryad ...
Engesser, Sabrina; Crane, Jodie M. S.; Savage, James L.. - : Dryad Digital Repository, 2015
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18
Experimental evidence for phonemic contrasts in a nonhuman vocal system
Engesser, Sabrina; Crane, Jodie M. S.; Savage, James L.. - : Public Library of Science, 2015
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19
Vocal learning in the functionally referential food grunts of chimpanzees
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20
Language evolution: syntax before phonology? ...
Collier, Katie; Bickel, Balthasar; Van Schaik, Carel P. - : Royal Society Publishing, 2014
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