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dc.contributor.authorDe Boer, Bart
dc.contributor.authorWich, Serge A.
dc.contributor.authorHardus, Madeleine E.
dc.contributor.authorLameira, Adriano R.
dc.identifier.citationDe Boer , B , Wich , S A , Hardus , M E & Lameira , A R 2015 , ' Acoustic models of orangutan hand-assisted alarm calls ' , Journal of Experimental Biology , vol. 218 , no. 6 , pp. 907-914 .
dc.identifier.otherPURE: 252019127
dc.identifier.otherPURE UUID: ea0944c7-10dc-44b1-9618-b0a44273ff7c
dc.identifier.otherScopus: 84964260982
dc.identifier.otherPubMed: 25788727
dc.descriptionB.d.B. was funded by the European research council starting grant ABACUS project and the Innoviris ‘Brains back to Brussels’ programme. S.A.W. was funded by the Netherlands Organisation for Scientific Research NWO. A.R.L. was funded by the Menken Funds (University of Amsterdam).en
dc.description.abstractOrangutans produce alarm calls called kiss-squeaks, which they sometimes modify by putting a hand in front of their mouth. Through theoretical models and observational evidence, we show that using the hand when making a kiss-squeak alters the acoustics of the production in such a way that more formants per kilohertz are produced. Our theoretical models suggest that cylindrical wave propagation is created with the use of the hand and face as they act as a cylindrical extension of the lips. The use of cylindrical wave propagation in animal calls appears to be extremely rare, but is an effective way to lengthen the acoustic system; it causes the number of resonances per kilohertz to increase. This increase is associated with larger animals, and thus using the hand in kiss-squeak production may be effective in exaggerating the size of the producer. Using the hand appears to be a culturally learned behavior, and therefore orangutans may be able to associate the acoustic effect of using the hand with potentially more effective deterrence of predators.
dc.relation.ispartofJournal of Experimental Biologyen
dc.rights© 2015 The Author(s). Published by The Company of Biologists Ltd. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at:
dc.subjectSize exaggerationen
dc.subjectSound productionen
dc.subjectQL Zoologyen
dc.subjectEcology, Evolution, Behavior and Systematicsen
dc.subjectAquatic Scienceen
dc.subjectMolecular Biologyen
dc.subjectAnimal Science and Zoologyen
dc.subjectInsect Scienceen
dc.titleAcoustic models of orangutan hand-assisted alarm callsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Psychology and Neuroscienceen
dc.contributor.institutionUniversity of St Andrews.Centre for Social Learning & Cognitive Evolutionen
dc.description.statusPeer revieweden

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