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Comparing internal and external standards in voice quality judgments

B R Gerratt1, J Kreiman, N Antonanzas-Barroso

  • 1VA Medical Center, West Los Angeles, CA.

Journal of Speech and Hearing Research
|February 1, 1993
PubMed
Summary

Using explicit anchor stimuli improved voice quality ratings. This method enhanced listener reliability and prevented rating drift compared to traditional scales, benefiting clinical voice assessment.

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Area of Science:

  • Speech and Hearing Sciences
  • Acoustic Phonetics
  • Perceptual Voice Evaluation

Background:

  • Voice quality perception relies on listeners comparing stimuli to internal standards.
  • Internal standards for vocal qualities are unstable and susceptible to context effects.
  • This instability can lead to drift in voice ratings over time.

Purpose of the Study:

  • To test if explicit, external standards improve listener reliability in voice quality ratings.
  • To investigate whether anchored scales prevent context-induced drift in voice perception.
  • To compare the reliability of anchored versus unanchored rating scales for voice quality.

Main Methods:

  • 12 clinicians rated the roughness of 22 synthetic voice stimuli.
  • Two rating scales were used: a traditional 5-point equal-appearing interval (EAI) scale and an explicitly anchored scale.

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  • Stimuli included normal and mildly rough voices to induce potential drift.

    • Main Results:

    • Ratings using the anchored scale were significantly more reliable than those using the unanchored EAI scale.
    • Ratings on the unanchored EAI scale showed significant drift within the listening session.
    • Ratings on the anchored scale did not exhibit significant drift.

    Conclusions:

    • Explicitly anchored paradigms enhance listener reliability in voice quality evaluation.
    • Anchored scales mitigate context effects and prevent rating drift, unlike traditional EAI scales.
    • This approach offers potential improvements for both voice research and clinical practice.