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  • Title: Children's speech recognition in noise using omni-directional and dual-microphone hearing aid technology.
    Author: Gravel JS, Fausel N, Liskow C, Chobot J.
    Journal: Ear Hear; 1999 Feb; 20(1):1-11. PubMed ID: 10037061.
    Abstract:
    OBJECTIVE: The purpose of this study was to examine children's speech recognition abilities for words and sentences presented in background noise when the children used omni-directional and dual-microphone hearing aid technology. DESIGN: Twenty children (ten 4- to 6-yr olds; ten 7- to 11-yr-olds) with bilateral cochlear hearing loss (average four-frequency hearing loss = 57.25 dB HL; range: mild to severe) were included in the study. An adaptive test procedure was used to estimate a signal to noise ratio (SNR) that reduced individual speech recognition ability to 50% in multi-talker background competition. Testing was completed with the child seated in a conventional audiologic test suite. A fixed level of the speech signal was delivered through a loudspeaker located at 0 degrees; noise varying in 2 dB steps was presented at 180 degrees. SNR was estimated for two types of speech materials (closed-set words and sentences). Children wore binaural programmable hearing aids (Phonak PiCS) and were tested in conventional omni-directional and dual-microphone ("Audio Zoom") conditions. RESULTS: Significant effects of microphone condition, speech material type (words and sentences), and age group ("younger" and "older") were revealed by mixed design analysis of variance. Overall, children received a mean advantage of 4.7 dB from listening in the dual-microphone condition. Children's performance was correlated with their chronological age and language age (receptive vocabulary) but not with their degree of hearing loss (except in one condition). Younger children required a more advantageous SNR to achieve the same performance criteria as older children. CONCLUSIONS: Under the specific test conditions used in this investigation, dual-microphone hearing aid technology provided a significant listening advantage in background competition over conventional omni-directional microphones for children with mild to severe cochlear hearing loss for both word and sentence test materials.
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