Abstract
Presbyacusic listeners with moderate sloping sensorineural bearing impairment were presented the California Consonant Test in three conditions: unaided; with flat frequency response aid; and with high-frequency emphasis hearing aid. Frequency selectivity was assessed using the metric Q1 octave, for a simultaneous pure tone masking paradigm. Three distinct error patterns were found when the data from the unaided and aided conditions were compared: (1) errors on a phone disappeared with amplification (e.g./t∫); (2) errors changed from one phone to another with amplification (e.g./for/s/); and (3) the errors were the same and were not eliminated by amplification (for the stop consonants). In the latter case, the best correlation of PTA for any set of frequencies and improvement in stop consonant recognition was −0.35; the best correlation of Q1 octave and improvement in stop recognition under aided conditions was 0.63. Even though Q1 octave was a better predictor of improvement than was the PTA, the range of improvement with similar Q scores was considerable.
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