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Comfortable effort level revisited

W S Brown1, R J Morris, T Murry

  • 1Institute for Advanced Study of the Communication Processes, University of Florida, Gainesville 32611, USA.

Journal of Voice : Official Journal of the Voice Foundation
|September 1, 1996
PubMed
Summary
This summary is machine-generated.

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Speech frequency and intensity show variability across sessions, age groups, and gender. Expect about +/- 1 semitone for speaking fundamental frequency (SFF) and 2 dB for vocal intensity between sessions.

Area of Science:

  • Speech Science
  • Acoustic Phonetics
  • Voice Production

Background:

  • Understanding speech variability is crucial for voice analysis and clinical assessment.
  • Previous research has explored vocal variability, but comprehensive data across different age groups and speaking tasks is limited.

Purpose of the Study:

  • To quantify the variability in speech frequency and intensity at a comfortable effort level.
  • To assess within- and across-session variability in speaking fundamental frequency (SFF) and vocal intensity.

Main Methods:

  • Collected multiple voice samples from participants over a 3-day period.
  • Measured speaking fundamental frequency (SFF) and vocal intensity for repeated utterances, a standard passage reading, and extemporaneous speech.
  • Analyzed data from three age groups (young, middle-aged, elderly) of men and women.

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Main Results:

  • Significant variability in SFF and vocal intensity was observed across experimental sessions, age groups, gender, and speaking samples.
  • Group means indicated typical session-to-session variability of approximately +/- 1 semitone for SFF and +/- 2 dB SPL for vocal intensity.
  • Individual variations within groups could reach up to 2 semitones for SFF and 6 dB SPL for vocal intensity.

Conclusions:

  • Speech frequency and intensity exhibit inherent variability influenced by multiple factors.
  • These findings provide normative data for expected vocal variability in healthy adults across different age strata.
  • The results have implications for voice disorder assessment and the interpretation of speech production measures.