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Our analyses reveal clear trends: as speech rate increases, Thai speakers predominantly adjust the rate of fundamental frequency (f0) change to maintain tonal contours, with minimal alterations to contour shapes and values. Additionally, speakers tend to elevate the f0 onset value for most tones, positioning the contour within a higher f0 space at faster rates. While effects resembling \u201ctruncation\u201d and undershoot of f0 contours occur in specific tonal combinations at faster speaking rates, we suggest that they are best attributed to global retiming of laryngeal commands governing f0 production. The strategies observed in laryngeal adjustments during faster speech rates are, thus, reminiscent of those observed in supralaryngeal articulation, suggesting the existence of a unified mechanism where rate effects impact both laryngeal and supralaryngeal articulation.<\/jats:p>","DOI":"10.1121\/10.0038965","type":"journal-article","created":{"date-parts":[[2025,8,19]],"date-time":"2025-08-19T12:50:42Z","timestamp":1755607842000},"page":"1204-1226","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":1,"title":["Effects of speaking rate on f0 trajectories: Evidence from Thai lexical tones"],"prefix":"10.1121","volume":"158","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9667-287X","authenticated-orcid":false,"given":"Francesco","family":"Burroni","sequence":"first","affiliation":[{"name":"Institute for Phonetics and Speech Processing, LMU Munich 1 , Munich, Bavaria 80799,","place":["Germany"]},{"name":"Department of Linguistics, Chulalongkorn University 2 , Pathum Wan, Bangkok 10330,","place":["Thailand"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0502-5245","authenticated-orcid":false,"given":"James","family":"Kirby","sequence":"additional","affiliation":[{"name":"Institute for Phonetics and Speech Processing, LMU Munich 1 , Munich, Bavaria 80799,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"231","published-online":{"date-parts":[[2025,8,19]]},"reference":[{"key":"2025081908503582600_c1","volume-title":"The Vowels and Tones of Standard Thai: Acoustical Measurements and Experiments","year":"1962"},{"key":"2025081908503582600_c2","first-page":"1","article-title":"The coarticulation of tones: An acoustic study of Thai","volume-title":"Studies in Tai and Mon-Khmer Phonetics and Phonology In Honour of Eug\u00e9nie J.A. 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