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Learning from communication versus observation in great apes
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Context, not sequence order, affects the meaning of bonobo (Pan paniscus) gestures
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Bo-NO-bouba-kiki : picture-word mapping but no spontaneous sound symbolic speech-shape mapping in a language trained bonobo
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4
Listening to the zoo : challenging zoo visiting conventions
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5
Collective knowledge and the dynamics of culture in chimpanzees
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6
Chimpanzees combine pant hoots with food calls into larger structures
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7
The vocal repertoire of pale spear-nosed bats in a social roosting context
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8
Chimpanzee lip-smacks confirm primate continuity for speech-rhythm evolution
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9
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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10
Combinatoriality in the vocal systems of nonhuman animals
Engesser, Sabrina; Townsend, Simon W.. - : John Wiley & Sons Ltd., 2019
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11
Thirty years of great ape gestures
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12
Bonobo and chimpanzee gestures overlap extensively in meaning
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13
Cumulative culture in nonhumans : overlooked findings from Japanese monkeys?
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14
Speech-like rhythm in a voiced and voiceless orangutan call
Abstract: A.R.L. thanks the Menken Funds of the University of Amsterdam. ; The evolutionary origins of speech remain obscure. Recently, it was proposed that speech derived from monkey facial signals which exhibit a speech-like rhythm of ∼5 open-close lip cycles per second. In monkeys, these signals may also be vocalized, offering a plausible evolutionary stepping stone towards speech. Three essential predictions remain, however, to be tested to assess this hypothesis' validity; (i) Great apes, our closest relatives, should likewise produce 5Hz-rhythm signals, (ii) speech-like rhythm should involve calls articulatorily similar to consonants and vowels given that speech rhythm is the direct product of stringing together these two basic elements, and (iii) speech-like rhythm should be experience-based. Via cinematic analyses we demonstrate that an ex-entertainment orangutan produces two calls at a speech-like rhythm, coined "clicks" and "faux-speech." Like voiceless consonants, clicks required no vocal fold action, but did involve independent manoeuvring over lips and tongue. In parallel to vowels, faux-speech showed harmonic and formant modulations, implying vocal fold and supralaryngeal action. This rhythm was several times faster than orangutan chewing rates, as observed in monkeys and humans. Critically, this rhythm was seven-fold faster, and contextually distinct, than any other known rhythmic calls described to date in the largest database of the orangutan repertoire ever assembled. The first two predictions advanced by this study are validated and, based on parsimony and exclusion of potential alternative explanations, initial support is given to the third prediction. Irrespectively of the putative origins of these calls and underlying mechanisms, our findings demonstrate irrevocably that great apes are not respiratorily, articulatorilly, or neurologically constrained for the production of consonant- and vowel-like calls at speech rhythm. Orangutan clicks and faux-speech confirm the importance of rhythmic speech antecedents within the primate lineage, and highlight potential articulatory homologies between great ape calls and human consonants and vowels. ; Publisher PDF ; Peer reviewed
Keyword: Agricultural and Biological Sciences(all); Biochemistry; Genetics and Molecular Biology(all); Medicine(all); NDAS; QH301; QH301 Biology; QL; QL Zoology
URL: http://hdl.handle.net/10023/12452
https://doi.org/10.1371/journal.pone.0116136
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15
A gestural repertoire of 1-2year old human children : in search of the ape gestures
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16
Compositionality in animals and humans
Townsend, Simon W.; Engesser, Sabrina; Stoll, Sabine. - : Public Library of Science, 2018
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17
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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18
Sensitivity to relational similarity and object similarity in apes and children
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19
Zoonotic diagrams : mastering and unsettling human-animal relations
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20
Titi semantics : context and meaning in Titi monkey call sequences
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