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A Phoneme Perception Test Method for High-Frequency Hearing Aid Fitting.

Nicola Schmitt, Alexandra Winkler, Michael Boretzki

    Journal of the American Academy of Audiology
    |May 15, 2016
    PubMed
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    This study found that the Phoneme Perception Test (PPT) using high-frequency stimuli effectively measures hearing aid (HA) effects on speech audibility and recognition. The test is crucial for evaluating speech modification algorithms and understanding high-frequency sound processing.

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    Area of Science:

    • Audiology
    • Speech Science
    • Hearing Instrument Technology

    Background:

    • Standard hearing aid (HA) outcome measures often lack sensitivity to changes in high-frequency audibility.
    • Assessing HA effectiveness requires tests sensitive to high-frequency speech perception.

    Purpose of the Study:

    • To evaluate the Phoneme Perception Test (PPT) for measuring individual differences in phoneme audibility and recognition.
    • To assess the impact of different hearing instrument settings, specifically nonlinear frequency compression (NLFC), on speech perception.
    • To compare the efficacy of two stimulus sets (LF and nLF) in revealing HA and NLFC effects.

    Main Methods:

    • A repeated measures design was employed with 31 participants with sensorineural hearing loss.
    • Phoneme detection and recognition tests were conducted using two stimulus sets (LF and nLF) under unaided, aided, and two NLFC settings.
    • Statistical analysis focused on the PPT's ability to measure audibility and perception of high-frequency information.

    Main Results:

    • Stimulus set nLF showed higher correlation with audiometric thresholds compared to LF stimuli.
    • The difference in thresholds between unaided and aided conditions was greater for nLF stimuli.
    • A 'too strong' NLFC setting significantly altered phoneme detection and recognition thresholds for /s/.

    Conclusions:

    • The nLF stimulus set is effective for quantifying HA and NLFC effects on high-frequency speech cues.
    • Both detection and recognition tests are necessary to assess audibility and recognition abilities related to speech modification algorithms.
    • Further research is needed to investigate acclimatization effects and the impact of strong NLFC settings on phoneme perception.