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Under special circumstances such as voice pathology or singing, they vibrate together with the vocal folds to contribute to the production of voice. In the present study, experimental data measured from physical models of the vocal and ventricular folds were analyzed in the light of nonlinear dynamics. The physical models provide a useful experimental framework to study the biomechanics of human vocalizations. Of particular interest in this experiment are co-oscillations of the vocal and ventricular folds, occasionally accompanied by irregular dynamics. We show that such a system can be regarded as two coupled oscillators, which give rise to various cooperative behaviors such as synchronized oscillations with a 1:1 or 1:2 frequency ratio and desynchronized oscillations with torus or chaos. The insight gained from the view of nonlinear dynamics should be of significant use for the diagnosis of voice pathologies, such as ventricular fold dysphonia.<\/jats:p>","DOI":"10.1063\/5.0155215","type":"journal-article","created":{"date-parts":[[2024,2,22]],"date-time":"2024-02-22T14:36:14Z","timestamp":1708612574000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":10,"title":["Nonlinear dynamics and chaos in a vocal-ventricular fold system"],"prefix":"10.1063","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-7021-3559","authenticated-orcid":false,"given":"Takumi","family":"Inoue","sequence":"first","affiliation":[{"name":"Graduate School of Science and Engineering, Ritsumeikan University , Noji-higashi, Kusatsu, Shiga 525\u20138577, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7737-3444","authenticated-orcid":false,"given":"Kota","family":"Shiozawa","sequence":"additional","affiliation":[{"name":"Graduate School of Science and Engineering, Ritsumeikan University , Noji-higashi, Kusatsu, Shiga 525\u20138577, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-3435-3672","authenticated-orcid":false,"given":"Takuma","family":"Matsumoto","sequence":"additional","affiliation":[{"name":"Graduate School of Science and Engineering, Ritsumeikan University , Noji-higashi, Kusatsu, Shiga 525\u20138577, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2719-332X","authenticated-orcid":false,"given":"Mayuka","family":"Kanaya","sequence":"additional","affiliation":[{"name":"Graduate School of Science and Engineering, Ritsumeikan University , Noji-higashi, Kusatsu, Shiga 525\u20138577, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6212-0022","authenticated-orcid":false,"given":"Isao T.","family":"Tokuda","sequence":"additional","affiliation":[{"name":"Graduate School of Science and Engineering, Ritsumeikan University , Noji-higashi, Kusatsu, Shiga 525\u20138577, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2024,2,22]]},"reference":[{"key":"2024022219360214200_c1","volume-title":"Synchronization: A Universal Concept in Nonlinear Sciences","year":"2003"},{"key":"2024022219360214200_c2","doi-asserted-by":"publisher","first-page":"237","DOI":"10.1016\/j.physrep.2006.11.001","article-title":"Recurrence plots for the analysis of complex systems","volume":"438","year":"2007","journal-title":"Phys. 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