Relationship between correct answer rate for Japanese monosyllables and their initial acoustic energy in hearing impaired patients

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  • 難聴者の単音節別正答率と初期音響エネルギーとの関係

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Abstract

<p>　Although studies have shown that Japanese monosyllables can be indiscernible to individuals with sensorineural hearing loss, the acoustic features that make these monosyllables difficult to discern have not yet been clearly identified. In this study, focusing on the initial acoustic energy, the relationship between the initial rise of the sound exposure level (LAE [dB]) and the correct answer rate for monosyllables was examined. The LAE is defined as accumulated sound energy level from the onset of the monosyllable. When the early arrival time (tatt) was defined by the duration required to reach a desired LAE (Latt), the time on a logarithmic scale (logtatt) showed a strong negative correlation with the correct answer rate for monosyllables whose voice onset times were not less than 0ms. In other words, the correct answer rate was high for monosyllables whose LAE value rose more steeply. The correlation became high for individuals whose speech intelligibilities were profoundly low (r=-0.77, p<0.01). Meanwhile, monosyllables whose voice onset times were less than zero had were associated with? vocal cord vibrations (VCV) in advance of the consonant parts, such that the equalized initial rises of the LAE made the correlation obscure. The correct answer rates in elder people were decreased because of elimination of the VCVs, and it can thus be said that the initial acoustic energy including the VCVs affects speech discrimination.</p>

Journal

  • AUDIOLOGY JAPAN

    AUDIOLOGY JAPAN 65 (4), 271-279, 2022-08-30

    Japan Audiological Society

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