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Consonant discrimination as a function of presentation level.

R D Kent, T L Wiley, M L Strennen

    Audiology : Official Organ of the International Society of Audiology
    |May 1, 1979
    PubMed
    Summary
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    Varying presentation levels significantly impact consonant discrimination in young adults. Some speech sounds require higher sound levels for accurate identification, while others are recognized easily even at lower decibel levels.

    Area of Science:

    • Audiology
    • Speech Perception
    • Psychoacoustics

    Background:

    • Accurate speech perception is crucial for effective communication.
    • Understanding how presentation level affects consonant discrimination is vital for audiological assessments and hearing aid fitting.

    Purpose of the Study:

    • To investigate the influence of presentation level on the discrimination of 20 consonants in consonant-vowel (CV) syllables.
    • To analyze the variability in performance-intensity functions across different consonants.

    Main Methods:

    • Ten young adults with normal hearing participated.
    • Consonant discrimination was tested at seven presentation levels, ranging from 0 to 60 dB re the subject's Speech Reception Threshold (SRT).
    • Data were analyzed for stimulus/response bias and subjected to a feature analysis (voice, manner, place).

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    Main Results:

    • Performance-intensity functions for individual consonants showed wide variations.
    • Some consonants were not identified with 100% accuracy even at the highest tested level (60 dB re SRT).
    • Other consonants were consistently identified at a low level (10 dB SL).

    Conclusions:

    • Presentation level plays a critical role in consonant discrimination, with significant inter-consonant variability.
    • The findings highlight the importance of considering individual consonant audibility and acoustic features in speech perception research.
    • Results inform strategies for speech testing and rehabilitation in individuals with hearing impairments.