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Predicted and measured speech recognition performance in noise with linear amplification

Artikel i vetenskaplig tidskrift
Författare Lennart Magnusson
M. Karlsson
A. Leijon
Publicerad i Ear and Hearing
Volym 22
Nummer/häfte 1
Sidor 46-57
ISSN 0196-0202
Publiceringsår 2001
Publicerad vid Institutionen för särskilda specialiteter, Avdelningen för audiologi
Sidor 46-57
Språk en
Länkar www.ncbi.nlm.nih.gov/entrez/query.f...
Ämnesord Aged, Aged, 80 and over, Audiometry, Pure-Tone, Auditory Threshold/physiology, Female, *Hearing Aids, Hearing Loss, Sensorineural/diagnosis/*rehabilitation, Humans, Male, *Noise, Phonetics, Severity of Illness Index, Speech Perception/*physiology
Ämneskategorier Audiologi

Sammanfattning

OBJECTIVE: The purpose of this study was to investigate the applicability of the Speech Intelligibility Index (SII) in hearing aid fitting. It was hypothesized that estimated speech intelligibility, based on the SII, could be a more reliable measure than real speech recognition results for comparing hearing aid characteristics. DESIGN: The test subjects were 29 elderly persons (66 to 80 yr) with mild-to-moderate hearing loss, who were using monaurally fitted linear hearing aids. They were selected from the files at Sahlgrenska hearing clinic. Speech recognition scores were obtained at fixed speech-to-noise ratios with Phonemically Balanced (PB) words in speech-weighted noise and in low-frequency noise. A Just-Follow-Conversation (JFC) test was performed with connected speech presented in the same background noises. The subjects were tested without hearing aid and with their hearing aids set at three different frequency responses. Predicted speech recognition scores were calculated for each condition based on the SII, complemented with a correction for sensorineural hearing impairment. The calculations involved speech and noise spectra, pure tone thresholds and insertion gain responses. RESULTS: For each condition, the measured speech recognition scores were, on average, well predicted by the calculated scores. The intra-individual standard deviation of the predicted scores was estimated to be about one percent unit. The group results of the JFC test were in agreement with the word recognition results for the aided conditions, but a floor effect was observed for the unaided conditions. CONCLUSIONS: Speech intelligibility prediction based on the modified SII is a valid estimate of speech recognition performance of hearing-impaired persons with mild-to-moderate hearing loss. Estimated intelligibility based on the SII is more reliable than actually measured speech recognition performance, for comparing amplification conditions within subjects.

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