The contribution of a frequency-compression hearing aid to contralateral cochlear implant performance

Perreau, Ann Elizabeth

doi:10.17077/etd.b7hscc74

Cited by 6 publications

(11 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Results of the vowel identification task with our hearing impaired participants, which indicated negative effects of combined low start frequency and high compression ratio on performance, are consistent with the findings of Perreau, Bentler, and Tyler (2013), who found significant negative effects of frequency compression (implemented in a commercial hearing aid) on vowel identification in hearing impaired listeners. As stated previously, many of the participants in the Perreau, Bentler, and Tyler (2013) study were fit with frequency compression settings, selected using SoundRecover Fitting Assistant, nearly identical to the maximum frequency compression condition in this study (1.5 kHz knee point, 4:1 compression ratio).…”

Section: Discussionsupporting

confidence: 89%

“…Performance was generally high on this task and remained so across the frequency compression conditions. This lack of significant effects of frequency compression ratio on vowel perception was unexpected, though previous reports of deleterious effects of frequency compression on vowel identification were in individuals with moderate-to-severe sensorineural hearing loss (Perreau, Bentler, and Tyler, 2013), rather than in individuals with normal hearing.…”

Section: Figurementioning

confidence: 59%

“…Shifts in the frequency of vowel formant peaks can decrease listeners' ability to perceive separate formants (Chistovich and Lublinkskaya, 1979). The reported nonlinear frequency compression start frequencies in Glista et al (2009) were higher, on average, than those of Perreau, Bentler, and Tyler (2013), where a majority of the subjects were fit with the lowest available frequency compression knee point (1.5 kHz), which is below the typical second formant frequency for some vowels. As a result, the frequency compression implementation in Perreau, Bentler, and Tyler (2013) may have caused shifts in formant ratio or other distortions that negatively impacted performance.…”

Section: Frequency Lowering Signal Processing In Hearing Aidsmentioning

confidence: 78%

“…It is clear then that the use of frequency compression is not always beneficial for the listener and that benefit in perception of high frequency consonant sounds can be highly variable for individual users. Perreau, Bentler, and Tyler (2013) reported significantly poorer vowel and spondee-in-noise performance in adult listeners with moderate to severe hearing loss using frequency compression hearing aid signal processing compared to conventional hearing aid settings after two months of use. This finding was in contrast to the lack of significant effects of frequency compression on vowel recognition reported by Glista et al (2009).…”

Section: Frequency Lowering Signal Processing In Hearing Aidsmentioning

confidence: 91%

“…Nonetheless, Hillock-Dunn (2014) used SoundRecover Fitting Assistant to set nonlinear frequency setting for their participants and found no improvement compared to conventional hearing aid processing. Perreau, Bentler, and Tyler (2013), who observed decrements in vowel and spondee performance with nonlinear frequency compression, also used SoundRecover Fitting Assistant to program knee point and compression ratio settings for their subjects.…”

Section: Frequency Lowering Signal Processing In Hearing Aidsmentioning

confidence: 99%

See 4 more Smart Citations

The impact of frequency compression on cortical evoked potentials and perception

Kirby¹

View full text Add to dashboard Cite

provided invaluable technical assistance without which this work could not have been completed.Many thanks are owed to my family and friends. v ABSTRACT Nonlinear frequency compression is a signal processing technique used to increase the audibility of high frequency speech sounds for hearing aid users with sloping, high frequency hearing loss. However, excessive compression ratios may reduce spectral contrast between sounds and negatively impact speech perception. This is of particular concern in infants and young children, who may not be able to provide feedback about frequency compression settings. This study explores use of an objective cortical auditory evoked potential that is sensitive to changes in spectral contrast, the auditory change complex (ACC), in the verification of frequency compression parameters.We recorded ACC responses in adult listeners to a spectral ripple contrast stimulus processed with a range of frequency compression ratios (1:1 to 4:1). Vowel identification, consonant identification, speech recognition in noise (QuickSIN), and behavioral ripple discrimination thresholds were also measured under identical frequency compression conditions. In Experiment 1, these measures were completed in ten adult normal hearing individuals to determine the effects of this type of signal processing in individuals with optimal hearing. In Experiment 2, these same measures were repeated in ten adults with sloping, high frequency hearing loss, which is the clinical population for whom this signal processing technique was intended.Increasing the compression ratio did not affect vowel identification for the NH group but did cause a significant decrease in vowel identification for the hearing impaired listeners. Changes in compression ratio were associated with significant changes in ACC amplitude, consonant identification, ripple discrimination threshold, and speech perception in noise scores.These results indicate that the ACC response, like speech and non-speech perceptual measures, is sensitive to frequency compression ratio. However, it was observed that the amplitude of ACC responses elicited by our single ripple contrast vi stimulus was not strongly correlated with behavioral ripple discrimination or measures of speech perception in quiet or in noise. It may be the case that using a different ripple density in the evoking stimulus (e.g. 1 RPO, 2 RPO), or determination of ACC threshold by using multiple ripple densities, would result in stronger correlation to behavioral measures across frequency compression conditions. vii

show abstract

Section: Discussionsupporting

confidence: 89%

Section: Figurementioning

confidence: 59%

Section: Frequency Lowering Signal Processing In Hearing Aidsmentioning

confidence: 78%

Section: Frequency Lowering Signal Processing In Hearing Aidsmentioning

confidence: 91%

Section: Frequency Lowering Signal Processing In Hearing Aidsmentioning

confidence: 99%

See 3 more Smart Citations

The impact of frequency compression on cortical evoked potentials and perception

Kirby¹

View full text Add to dashboard Cite

show abstract

A Literature Review of Bimodal Fitting

Bahng

2020

Audiol Speech Res

View full text Add to dashboard Cite

Although there are quite a few bimodal cochlear implant users, bimodal fitting guidelines were not fully developed. Bimodal fitting optimization is one of the factors that contribute to successful bimodal outcomes. The purpose of this study is to investigate recent literatures related to bimodal fitting to establish evidence based bimodal fitting guidelines. Three databases including Google Scholar, PubMed publisher, and PLOS One were searched to review bimodal fitting literatures. A total of 599,604 articles were identified by using ten bimodal relevant keywords at the initial stage. Then, we included 192 articles with abstract review, inclusion and exclusion criteria and removals of duplicates. Lastly, two authors reviewed full texts and identified a total of 19 bimodal fitting articles. Results were categorized into type of bimodal intervention, procedures, and outcomes. Bimodal fitting procedures, test materials, and questionnaires were also summarized. A total of 18 articles consist of bimodal hearing aid fitting covering hearing aid fitting formula, gain adjustment, loudness balance, frequency band, frequency lowering technology, and overall bimodal fitting guidelines. Only one article includes bimodal cochlear implant fitting with low frequency band adjustment. Several factors including real-ear measurement, loudness balance test, frequency band selection considering cochlear dead region, and subjective questionnaires are considered to optimize bimodal hearing aid fitting. Bimodal fitting guidelines considering several relevant factors will optimize bimodal fitting and improve bimodal benefits.

show abstract

A Review of Bimodal Hearing Aid Fitting

Oh¹

2019

Audiol Speech Res

View full text Add to dashboard Cite

바이모달 보청기 적합 문헌 고찰Bimodal hearing refers to the combination of the cochlear implant in one ear and the hearing aid in the opposite ear. Recently, cochlear implant candidacy criteria have been expanded and the number of people receiving cochlear implants with residual hearing has increased, leading to the raised bimodal population. Providing professional fitting services based on systematic bimodal fitting methods or guidelines are essential for the successful bimodal intervention of the hearing impaired. However, there is a lack of evidence-based bimodal fitting method or guideline clinically applicable. In general, bimodal fitting consists of three areas of fitting; cochlear implant mapping, hearing aid fitting, and bimodal fitting. Among them, establishing evidence-based bimodal hearing aid fitting will be a key factor to improve bimodal fitting services of hearing aid centers. The purpose of this study is to review recent literature related to bimodal hearing aid fitting to establish bimodal hearing aid fitting guidelines for hearing aid professionals. This review involves five bimodal hearing aid fitting issues including frequency response, loudness, dynamic compression, frequency transposition, and hearing aid fitting formula. In addition, it described three recent clinical bimodal hearing aid fitting guidelines provided by manufacturers. Two factors contributing to bimodal hearing aid fitting optimization across the studies are frequency response and loudness balance. Conducting loudness balance in bimodal hearing devices and adjusting gains based on the loudness balance tests are one of the important procedures for bimodal fitting optimization. Hearing aid fitting based on wide-band frequency responses and conventional hearing aid formula is recommended for the initial step of the bimodal fitting.

show abstract

The contribution of a frequency-compression hearing aid to contralateral cochlear implant performance

Cited by 6 publications

References 43 publications

The impact of frequency compression on cortical evoked potentials and perception

The impact of frequency compression on cortical evoked potentials and perception

A Literature Review of Bimodal Fitting

A Review of Bimodal Hearing Aid Fitting

Contact Info

Product

Resources

About