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Five words per vowel, two of which were produced twice, were analyzed for fo and estimates of the first four formants frequencies from 190 (97 female, 93 male) typically developing speakers ages 4\u201320\u2009years old. Findings revealed developmental trajectories with decreasing values of fo and formant frequencies. Sex differences in fo emerged at age 7. The decrease of fo was larger in males than females with a marked drop during puberty. Sex differences in formant frequencies appeared at the earliest age under study and varied with vowel and formant. Generally, the higher formants (F3-F4) were sensitive to sex differences. Inter- and intra-speaker variability declined with age but had somewhat different patterns, likely reflective of maturing motor control that interacts with the changing anatomy. This study reports a source of developmental normative data on fo and the first four formants in both sexes. The different developmental patterns in the first four formants and vowel-formant interactions in sex differences likely point to anatomic factors, although speech-learning phenomena cannot be discounted.<\/jats:p>","DOI":"10.1121\/1.5131271","type":"journal-article","created":{"date-parts":[[2019,11,12]],"date-time":"2019-11-12T18:51:10Z","timestamp":1573584670000},"page":"3255-3274","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":27,"title":["Corner vowels in males and females ages 4 to 20 years: Fundamental and F1\u2013F4 formant frequencies"],"prefix":"10.1121","volume":"146","author":[{"given":"Houri K.","family":"Vorperian","sequence":"first","affiliation":[{"name":"Vocal Tract Development Laboratory, Waisman Center, University of Wisconsin-Madison , 1500 Highland Avenue, Madison, Wisconsin 53705, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Raymond D.","family":"Kent","sequence":"additional","affiliation":[{"name":"Vocal Tract Development Laboratory, Waisman Center, University of Wisconsin-Madison , 1500 Highland Avenue, Madison, Wisconsin 53705, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yen","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Educational Psychology, University of Wisconsin-Madison , 1086 Educational, Sciences Building, 1025 West Johnson Street, Madison, Wisconsin 53706, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel M.","family":"Bolt","sequence":"additional","affiliation":[{"name":"Department of Educational Psychology, University of Wisconsin-Madison , 1086 Educational, Sciences Building, 1025 West Johnson Street, Madison, Wisconsin 53706, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"231","published-online":{"date-parts":[[2019,11,12]]},"reference":[{"issue":"3","key":"2023080508364484500_c1","first-page":"148","article-title":"Analysis of a vowel database","volume":"36","year":"2008","journal-title":"Can. 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