Objective vocal parameters in Farsi-speaking adults with Down syndrome

Sadegh Seifpanahi, Mehdi Bakhtiar, Tahmineh Salmalian

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)


Previous studies have indicated significant differences in vocal parameters between children with Down syndrome and normal children. This study was performed to see whether there is a significant dissociation between normal adults and adults with Down syndrome in terms of some vocal parameters. The participants were 22 adults with Down syndrome and 22 normal adults matched for age and gender. We measured jitter, shimmer, fundamental frequency (F0), and maximum phonation time (MPT). The results showed a significantly higher F0 and a significantly lower jitter in the Down syndrome group compared to the control group, while the average amounts of MPT and shimmer were not different. Moreover, the shimmer and jitter of females in both groups were lower than those of males. These findings might be the result of a physiological retardation of the larynx rather than mental retardation in the Down syndrome population.
Original languageEnglish
Pages (from-to)72-76
Number of pages5
JournalFolia Phoniatrica et Logopaedica
Issue number2
Publication statusPublished - 1 Feb 2011
Externally publishedYes


  • Down syndrome
  • Jitter
  • Maximum phonation time
  • Shimmer
  • Vocal parameters

ASJC Scopus subject areas

  • Language and Linguistics
  • Linguistics and Language
  • Speech and Hearing
  • LPN and LVN


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