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However, these theories do not clearly specify which aspects of articulatory motion are reliably coordinated across signal stretches spanning multiple segments. The present study tested the hypothesis that phonological structure is realized through temporal coordination of movement onsets across successive segments. Using electromagnetic articulography, we recorded tongue-tip and jaw movements as participants produced vowel\u2013consonant\u2013vowel sequences with varied vowels (\/\u0251\/-\/\u025b\/) and alveolar stops (\/t\/-\/d\/) across rate (fast vs normal) and stress (first-syllable stressed vs unstressed) conditions. Temporal coordination between vowel-related jaw and consonant-related tongue-tip movements was analyzed across conditions. Results showed that movement onset timing across articulators was consistently maintained, such that inter-movement intervals scaled reliably across conditions, whereas the timing of peak displacements and offsets varied with rate and stress. Importantly, movement onsets scaled more reliably in absolute time than when computed proportionally to movement duration. Collectively, these findings demonstrate that articulatory movement onsets are governed by fixed timing control, whereas later portions of movement trajectories are flexibly adjusted to meet evolving task demands.<\/jats:p>","DOI":"10.1121\/10.0043331","type":"journal-article","created":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T18:32:32Z","timestamp":1776105152000},"page":"3241-3256","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Temporal coordination of articulatory movements across speech segments: Fixed onsets with flexible kinematic trajectories"],"prefix":"10.1121","volume":"159","author":[{"given":"Matthew","family":"Masapollo","sequence":"first","affiliation":[{"name":"Department of Communication Sciences and Disorders, University of Oklahoma Health Sciences 1 , 1200 North Stonewall Avenue, Oklahoma City, Oklahoma 73117,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ann","family":"Stewart","sequence":"additional","affiliation":[{"name":"Department of Communication Sciences and Disorders, University of Oklahoma Health Sciences 1 , 1200 North Stonewall Avenue, Oklahoma City, Oklahoma 73117,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ashlyn","family":"Ludwig","sequence":"additional","affiliation":[{"name":"Department of Communication Sciences and Disorders, University of Oklahoma Health Sciences 1 , 1200 North Stonewall Avenue, Oklahoma City, Oklahoma 73117,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nathan","family":"Maxfield","sequence":"additional","affiliation":[{"name":"Department of Communication Sciences and Disorders, University of South Florida 2 , 4202 E. 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