Acoustic and perceptual correlates of stress in nonwords produced by children with suspected developmental apraxia of speech and children with phonological disorder

Benjamin Munson, Elissa M. Bjorum, Jennifer Windsor

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Previous research (L. Shriberg, D. Aram, & J. Kwiatkowski, 1997b, 1997c) has suggested that accuracy in producing linguistic stress reliably distinguishes between children with suspected developmental apraxia of speech (sDAS) and children with phonological disorder (PD). The current investigation tested this hypothesis by examining acoustic correlates of stress in trochaic (strong-weak) and iambic (weak-strong) nonwords produced by 5 children in each of these 2 groups. Four measures relating to stress production were examined: vowel duration, fundamental frequency (f0) at vowel midpoint, timing of the f0 peak relative to vowel onset, and intensity at vowel midpoint. In addition, perceptual judgments of accuracy of stress production were obtained. No group differences in the production of stress were found; however, listeners judged that the nonword repetitions of children with sDAS matched the target stress contour less often than did the repetitions of children with PD. Multiple regression analyses found that mean vowel duration, as well as the relative duration and relative f0 of stressed and stressless syllables, predicted listeners' judgments of stress, although these variables only accounted for a small proportion of variance (21.8%). Thus, children with sDAS were able to produce acoustic differences between stressed and stressless syllables, but these differences were not consistently perceptible to listeners.

Original languageEnglish (US)
Pages (from-to)189-202
Number of pages14
JournalJournal of Speech, Language, and Hearing Research
Volume46
Issue number1
DOIs
StatePublished - Feb 1 2003

Keywords

  • Acoustic analysis
  • Developmental apraxia of speech
  • Phonological disorder
  • Stress

Fingerprint Dive into the research topics of 'Acoustic and perceptual correlates of stress in nonwords produced by children with suspected developmental apraxia of speech and children with phonological disorder'. Together they form a unique fingerprint.

Cite this