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Perception of lateral misarticulation and its physical correlates.

M Akagi1, N Suzuki, K Hayashi

  • 1School of Information Science, Japan Advanced Institute of Science and Technology, Ishikawa, Japan. akagi@jaist.ac.jp

Folia Phoniatrica Et Logopaedica : Official Organ of the International Association of Logopedics and Phoniatrics (IALP)
|November 27, 2001
PubMed
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Sophisticated listeners identified lateral misarticulation (LM) by analyzing speech spectral envelopes. Specific acoustic features around 3.2 kHz in LM speech are key perceptual correlates.

Area of Science:

  • Speech Science
  • Acoustic Phonetics
  • Linguistics

Background:

  • Lateral misarticulation (LM) is a speech sound disorder affecting pronunciation.
  • Understanding the acoustic properties of LM is crucial for diagnosis and therapy.
  • The relationship between listener perception and physical correlates of LM requires further clarification.

Purpose of the Study:

  • To investigate the link between perceptual judgments of lateral misarticulation (LM) and its physical acoustic correlates.
  • To identify specific spectral envelope features in speech that contribute to the perception of LM.

Main Methods:

  • Three experiments were conducted using sustained speech sounds.
  • Experiment 1: Compared spectral envelopes of normal speech (NS) and LM speech.

Related Experiment Videos

  • Experiment 2: Assessed listener perception of NS and LM with manipulated spectral bands.
  • Experiment 3: Estimated speech spectra using vocal tract area functions.

    • Main Results:

    • LM speech exhibits flattened or decreasing spectral envelopes above 4 kHz, with a notable time-varying peak around 3.2 kHz.
    • Replacing normal speech spectral bands (2.5–4.5 kHz) with those from LM significantly increased perceived LM.
    • Acoustic peaks in LM appear related to vocal tract constriction length and position.

    Conclusions:

    • The spectral envelope characteristic around 3.2 kHz is a significant perceptual correlate of lateral misarticulation.
    • Vocal tract shape and constriction dynamics play a role in generating the acoustic features of LM.