Affiliation:
1. Department of Speech, Language, and Hearing Sciences, Purdue University,West Lafayette, Indiana
Abstract
Purpose
Frequency lowering in hearing aids can cause listeners to perceive [s] as [ʃ]. The S-SH Confusion Test, which consists of 66 minimal word pairs spoken by 6 female talkers, was designed to help clinicians and researchers document these negative side effects. This study's purpose was to use this new test to evaluate the hypothesis that these confusions will increase to the extent that low frequencies are altered.
Method
Twenty-one listeners with normal hearing were each tested on 7 conditions. Three were control conditions that were low-pass filtered at 3.3, 5.0, and 9.1 kHz. Four conditions were processed with nonlinear frequency compression (NFC): 2 had a 3.3-kHz maximum audible output frequency (MAOF), with a start frequency (SF) of 1.6 or 2.2 kHz; 2 had a 5.0-kHz MAOF, with an SF of 1.6 or 4.0 kHz. Listeners' responses were analyzed using concepts from signal detection theory. Response times were also collected as a measure of cognitive processing.
Results
Overall, [s] for [ʃ] confusions were minimal. As predicted, [ʃ] for [s] confusions increased for NFC conditions with a lower versus higher MAOF and with a lower versus higher SF. Response times for trials with correct [s] responses were shortest for the 9.1-kHz control and increased for the 5.0- and 3.3-kHz controls. NFC response times were also significantly longer as MAOF and SF decreased. The NFC condition with the highest MAOF and SF had statistically shorter response times than its control condition, indicating that, under some circumstances, NFC may ease cognitive processing.
Conclusions
Large differences in the S-SH Confusion Test across frequency-lowering conditions show that it can be used to document a major negative side effect associated with frequency lowering. Smaller but significant differences in response times for correct [s] trials indicate that NFC can help or hinder cognitive processing, depending on its settings.
Publisher
American Speech Language Hearing Association
Subject
Speech and Hearing,Linguistics and Language,Language and Linguistics
Reference80 articles.
1. Individual Variability in Recognition of Frequency-Lowered Speech
2. Alexander J. M.
(2013b). 20Q: The highs and lows of frequency lowering amplification. AudiologyOnline. Retrieved from https://www.audiologyonline.com/articles/20q-highs-and-lows-frequency-11772
3. Nonlinear frequency compression: Influence of start frequency and input bandwidth on consonant and vowel recognition
4. Alexander J. M.
(2016b). 20Q: Frequency lowering ten years later—New technology innovations. AudiologyOnline. Retrieved from https://www.audiologyonline.com/articles/20q-frequency-lowering-ten-years-18040
5. Effects of Frequency Compression and Frequency Transposition on Fricative and Affricate Perception in Listeners With Normal Hearing and Mild to Moderate Hearing Loss
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