{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,25]],"date-time":"2025-10-25T12:15:22Z","timestamp":1761394522190},"reference-count":51,"publisher":"American Speech Language Hearing Association","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Speech Lang Hear Res"],"published-print":{"date-parts":[[1998,8]]},"abstract":"<jats:p>This investigation examined the timing relationships of EMG activity underlying vowel production in 2 normal individuals and in 2 individuals with marked-tosevere apraxia of speech of approximately two-and-one-half years duration. The timing of lip muscle activity was investigated in monosyllabic words embedded in phrases and in syllable word stems as a function of changes in word length. Specifically, the onset and offset of EMG activity of lip muscles used for production of \/u\/ in the monosyllables and word stems were examined. The results revealed that the relative amounts of time devoted to onset and offset of EMG activity for lip rounding are disorganized in apraxia of speech. Word length appeared to affect the timing of the onset of muscle activity for both the normal speakers and the speakers with apraxia of speech. Word length also influenced the offset of muscle activity, but its effect was less systematic for the speakers with apraxia of speech. The findings suggest that termination of EMG activity may be at least as disturbed as the initiation of EMG activity in apraxia of speech.<\/jats:p>","DOI":"10.1044\/jslhr.4104.786","type":"journal-article","created":{"date-parts":[[2014,8,26]],"date-time":"2014-08-26T19:09:46Z","timestamp":1409080186000},"page":"786-801","source":"Crossref","is-referenced-by-count":5,"title":["Lip EMG Activity During Vowel Production in Apraxia of Speech"],"prefix":"10.1044","volume":"41","author":[{"given":"Monica Strauss","family":"Hough","sequence":"first","affiliation":[{"name":"East Carolina University Greenville, NC"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard J.","family":"Klich","sequence":"additional","affiliation":[{"name":"Kent State University Kent, OH"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1310","reference":[{"key":"e_1_3_2_2_1","doi-asserted-by":"crossref","first-page":"226","DOI":"10.1159\/000265767","article-title":"Acoustic analysis of vowel duration in apraxia of speech","volume":"35","author":"Caliguiri M.","year":"1983","journal-title":"Folia Phoniatrica"},{"key":"e_1_3_2_3_1","doi-asserted-by":"crossref","first-page":"251","DOI":"10.1080\/02687038808248919","article-title":"Apraxia of speech and phonemic paraphasia","volume":"2","author":"Canter G. 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