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Reliability of single sample experimental designs: comfortable effort level

W S Brown1, R J Morris, T DeGroot

  • 1Department of Communication Sciences and Disorders, University of Florida, Gainesville 32611, USA.

Journal of Voice : Official Journal of the Voice Foundation
|February 13, 1999
PubMed
Summary
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This study found minimal intrasubject variability in speech measures like fundamental frequency and vocal intensity across multiple sessions. This suggests consistent vocal performance, even when assessed over time.

Area of Science:

  • Speech science
  • Acoustic phonetics
  • Voice analysis

Background:

  • Intrasubject variability is often overlooked in speech research.
  • Single-sample designs limit understanding of vocal consistency.
  • Reliable speech measurements require assessing variability over time.

Purpose of the Study:

  • To quantify intrasubject variability in speech parameters.
  • To assess vocal consistency across multiple recording sessions.
  • To determine the extent of variation in speaking fundamental frequency, vocal intensity, and reading rate.

Main Methods:

  • Three age groups (young, middle-aged, elderly) participated.
  • Participants repeated the vowel /a/, read a standard passage, and spoke extemporaneously.

Related Experiment Videos

  • Intrasubject variability was analyzed within and across experimental sessions.

    • Main Results:

    • Minimal intrasubject variability was observed.
    • Approximately 4% of data showed significant variation across sessions.
    • Variability was assessed for speaking fundamental frequency, vocal intensity, and reading rate.

    Conclusions:

    • Intrasubject variability in speech measures is generally low.
    • Findings support the reliability of speech data collected across sessions.
    • This research provides a basis for more robust speech analysis.