Effects of frequency modulated tones and vowel formants on perioral muscle activity during isometric lip rounding

Shimon Sapir, Elizabeth DeRosier, Andrea M. Simonson, Amy Wohlert

Research output: Contribution to journalArticlepeer-review

Abstract

Two studies were conducted to assess the sensitivity of perioral muscles to vowel-like auditory stimuli. In one study, normal young adults produced an isometric lip rounding gesture while listening to a frequency modulated tone (FMT). The fundamental of the FMT was modulated over time in a sinusoidal fashion near the frequency ranges of the first and second formants of the vowels /u/ and /i/ (rate of modulation = 4.5 or 7 Hz). In another study, normal young adults produced an isometric lip rounding gesture while listening to synthesized vowels whose formant frequencies were modulated over time in a sinusoidal fashion to simulate repetitive changes from the vowel /u/ to /i/ (rate of modulation = 2 or 4 Hz). The FMTs and synthesized vowels were presented binaurally via headphones at 75 and 60 dB SL, respectively. Muscle activity from the orbicularis oris superior and inferior and from lip retractors was recorded with surface electromyography (EMG). Signal averaging and spectral analysis of the rectified and smoothed EMG failed to show perioral muscle responses to the auditory stimuli. Implications for auditory feedback theories of speech control are discussed.

Original languageEnglish
Pages (from-to)152-158
Number of pages7
JournalJournal of Voice
Volume4
Issue number2
DOIs
StatePublished - 1990
Externally publishedYes

Keywords

  • Auditory feedback
  • Auditory stimulation
  • Auditory-motor reflexes
  • Electromyography
  • Speech control
  • Speech physiology

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Speech and Hearing
  • LPN and LVN

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