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To address these questions, this study examines the syllable-initial r-sound, quantifying tongue contours for the r-phoneme itself and in relation to the retroflex sibilants (i.e., \/\u0282, t\u0282\n                    <jats:sup>h<\/jats:sup>\n                    , t\u0282\/). Both established and novel articulatory and acoustic measures are employed to assess their effectiveness in distinguishing phonetic contrasts. The ultrasound imaging results reveal that Putonghua onset \/r\/ is articulated with either a tip-up retroflex or a tip-down bunched tongue posture, specifying both coronal and dorsal gestures. Compared to \/\u0282, t\u0282\n                    <jats:sup>h<\/jats:sup>\n                    , t\u0282\/, the syllable-initial \/r\/ is produced with a greater degree of tip-up retroflexion and more pronounced tongue inflections, supported by vertical tongue displacement and discrete Fourier transform measurements. Acoustically, Putonghua \/r\/ is most often produced without frication and is characterized by low F3, F3F2 distance and zero crossing rates. The results find that even the fricated \/r\/ variant remains substantially distinct from sibilants both in tongue gestures and acoustic properties. The study argues that this phoneme should be classified as a retroflex approximant, transcribed as [\u027b], rather than a fricative [\u0290]. The results contribute substantial evidence to the limited articulatory corpus and enhance the understanding of the Putonghua rhotic\u2019s articulatory-acoustic correspondence, highlighting the importance of contextualizing phonetic variability within the phonology of the language.\n                  <\/jats:p>","DOI":"10.1177\/00238309251350082","type":"journal-article","created":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T09:09:50Z","timestamp":1753866590000},"page":"535-562","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["The Articulatory and Acoustic Variability in Putonghua Onset \/r\/"],"prefix":"10.1177","volume":"69","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9465-5662","authenticated-orcid":false,"given":"Shan","family":"Luo","sequence":"first","affiliation":[{"name":"College of International Studies, Yangzhou University, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2025,7,30]]},"reference":[{"key":"e_1_3_5_2_1","doi-asserted-by":"crossref","unstructured":"Barr D. 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