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Trans. R. Soc. B"],"published-print":{"date-parts":[[2025,4,3]]},"abstract":"<jats:p>\n                    We investigated the causal basis of abrupt frequency jumps in a unique database of New World monkey vocalizations. We used a combination of acoustic and electroglottographic recordings\n                    <jats:italic>in vivo<\/jats:italic>\n                    , excised larynx investigations of vocal fold dynamics, and computational modelling. We particularly attended to the contribution of the vocal membranes: thin upward extensions of the vocal folds found in most primates but absent in humans. In three of the six investigated species, we observed two distinct modes of vocal fold vibration. The first, involving vocal fold vibration alone, produced low-frequency oscillations, and is analogous to that underlying human phonation. The second, incorporating the vocal membranes, resulted in much higher-frequency oscillation. Abrupt fundamental frequency shifts were observed in all three datasets. While these data are reminiscent of the rapid transitions in frequency observed in certain human singing styles (e.g. yodelling), the frequency jumps are considerably larger in the nonhuman primates studied. Our data suggest that peripheral modifications of vocal anatomy provide an important source of variability and complexity in the vocal repertoires of nonhuman primates. We further propose that the call repertoire is crucially related to a species\u2019 ability to vocalize with different laryngeal mechanisms, analogous to human vocal registers.\n                  <\/jats:p>\n                  <jats:p>This article is part of the theme issue \u2018Nonlinear phenomena in vertebrate vocalizations: mechanisms and communicative functions\u2019.<\/jats:p>","DOI":"10.1098\/rstb.2024.0005","type":"journal-article","created":{"date-parts":[[2025,4,3]],"date-time":"2025-04-03T03:01:16Z","timestamp":1743649276000},"update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":6,"title":["\u2018Monkey yodels\u2019\u2014frequency jumps in New World monkey vocalizations greatly surpass human vocal register transitions"],"prefix":"10.1098","volume":"380","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9095-3953","authenticated-orcid":true,"given":"Christian T.","family":"Herbst","sequence":"first","affiliation":[{"name":"Department of Behavioral and Cognitive Biology, University of Vienna","place":["Vienna, Austria"]},{"name":"Center for the Evolutionary Origins of Human Behavior, Kyoto University","place":["Inuyama, Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6212-0022","authenticated-orcid":true,"given":"Isao T.","family":"Tokuda","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Ritsumeikan University","place":["Kusatsu, Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takeshi","family":"Nishimura","sequence":"additional","affiliation":[{"name":"Graduate School of Human Sciences, The University of Osaka","place":["Suita, Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sten","family":"Ternstr\u00f6m","sequence":"additional","affiliation":[{"name":"Department of Speech, Music and Hearing, School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology","place":["Stockholm, Sweden"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vicky","family":"Ossio","sequence":"additional","affiliation":[{"name":"La Senda Verde","place":["North Yungas, Bolivia"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marcelo","family":"Levy","sequence":"additional","affiliation":[{"name":"La Senda Verde","place":["North Yungas, Bolivia"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1830-0928","authenticated-orcid":true,"given":"W. 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