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Just noticeable differences for glottal flow waveform characteristics

R C Scherer1, K H Arehart, C G Guo

  • 1Department of Communication Disorders, Bowling Green State University, Ohio 43403, USA.

Journal of Voice : Official Journal of the Voice Foundation
|June 10, 1998
PubMed
Summary
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Singers can discern subtle vocal fold timing variations. This study found listeners could detect differences in open quotient and speed quotient, crucial for laryngeal function and auditory perception.

Area of Science:

  • Speech Science
  • Auditory Perception
  • Laryngeal Physiology

Background:

  • Understanding the relationship between laryngeal function and auditory perception is crucial for voice production and analysis.
  • Quantifying perceptual thresholds for vocal parameters like open quotient and speed quotient can inform voice diagnostics and training.

Purpose of the Study:

  • To determine the just noticeable differences (JNDs) for open quotient and speed quotient of glottal flow.
  • To investigate how these JNDs differ when applied to glottal flow versus synthesized vocal tract output pressure.
  • To explore potential gender-based differences in auditory perception of these vocal parameters.

Main Methods:

  • Participants (singing teachers) listened to synthesized glottal flow and output pressure signals representing the vowel /a/.

Related Experiment Videos

  • An adaptive auditory listening procedure was employed to estimate JNDs for open and speed quotients.
  • Statistical analyses compared JNDs across genders and stimulus types (glottal flow vs. output pressure).

    • Main Results:

    • JNDs for open quotient were 0.0264 (glottal flow) and 0.0344 (output pressure).
    • JNDs for speed quotient were 0.154 (glottal flow) and 0.319 (output pressure).
    • Perceptual variance was significantly higher for output pressure stimuli compared to glottal flow stimuli for both quotients.

    Conclusions:

    • Auditory perception of laryngeal function parameters (open and speed quotients) is possible.
    • The vocal tract significantly influences the perception of these parameters, with greater variability in perceived output pressure.
    • No significant gender differences were found in the perception of these vocal quotients.