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Effects of tonsillectomy on articulation

Y Hori1, Y Koike, G Ohyama

  • 1Department of Otolaryngology, The University of Tokushima, School of Medicine, Japan.

Acta Oto-Laryngologica. Supplementum
|January 1, 1996
PubMed
Summary

Tonsillectomy slightly alters Japanese vowel articulation, primarily affecting the F3 formant. While generally negligible in clinical practice, these vocal changes may impact professional singers.

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Area of Science:

  • Otolaryngology
  • Acoustic Phonetics
  • Speech Science

Background:

  • Tonsillectomy, a surgical procedure, may influence vocal tract articulation.
  • Acoustic analysis using formant frequencies provides objective measures of speech changes.

Purpose of the Study:

  • To investigate the effects of tonsillectomy on the articulation of Japanese vowels.
  • To compare acoustic changes in vowel formants before and after surgery.

Main Methods:

  • Acoustic analysis of 5 Japanese vowels in 40 patients post-tonsillectomy and 10 healthy controls.
  • Measurement of formant frequencies (F1, F2, F3, F4) and bandwidths before and 1 month after surgery.

Main Results:

  • Formant 3 (F3) showed a significant decrease in many cases, especially for the /o/ vowel.

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  • Other formants (F1, F2, F4) and bandwidths remained largely unchanged.
  • Larger tonsil size correlated with greater formant frequency changes.

    • Conclusions:

    • Tonsillectomy causes minor, generally clinically insignificant, alterations in Japanese vowel articulation.
    • The vocal tract appears to compensate over time through surrounding tissue adjustments.
    • Professional vocalists may experience more noticeable and problematic speech changes post-surgery.