Effects of Nonlinear Frequency Compression on ACC Amplitude and Listener Performance

Kirby, Benjamin; Brown, Carolyn J.

doi:10.1097/aud.0000000000000177

Cited by 15 publications

(21 citation statements)

References 45 publications

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“…While our focus has been on Hybrid CI users, the techniques we describe have and could be adapted to address a wide range of potentially clinically relevant questions. For example, Kirby and Brown (in press) report measures of the ACC evoked using ripple noise stimuli with contrasting spectra, similar to those described by Won and colleagues (2011). They showed that AAC amplitude measures were affected by the use of frequency compression in a hearing aid and that changes in the frequency compression ratio directly influenced the amplitude of the ACC recorded using rippled noise stimuli.…”

Section: Discussionmentioning

confidence: 77%

“…They showed that AAC amplitude measures were affected by the use of frequency compression in a hearing aid and that changes in the frequency compression ratio directly influenced the amplitude of the ACC recorded using rippled noise stimuli. While the current study describes essentially negative findings, our hope is the techniques similar to those used in this report and in the Won et al (2011) and the Kirby and Brown (in press) studies will serve as a small step toward identifying a larger role for CAEP in clinical practice.…”

Section: Discussionmentioning

confidence: 84%

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Cortical Auditory Evoked Potentials Recorded From Nucleus Hybrid Cochlear Implant Users

et al. 2015

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Objective Nucleus Hybrid CI users hear low-frequency sounds via acoustic stimulation and high frequency sounds via electrical stimulation. This within-subject study compares three different methods of coordinating programming of the acoustic and electrical components of the Hybrid device. Speech perception and cortical auditory evoked potentials (CAEP) were used to assess differences in outcome. The goals of this study were to determine (1) if the evoked potential measures could predict which programming strategy resulted either in better outcome on the speech perception task or was preferred by the listener, and (2) whether CAEPs could be used to predict which subjects benefitted most from having access to the electrical signal provided by the Hybrid implant. Design CAEPs were recorded from 10 Nucleus Hybrid CI users. Study participants were tested using three different experimental MAPs that differed in terms of how much overlap there was between the range of frequencies processed by the acoustic component of the Hybrid device and range of frequencies processed by the electrical component. The study design included allowing participants to acclimatize for a period of up to 4 weeks with each experimental program prior to speech perception and evoked potential testing. Performance using the experimental MAPs was assessed using both a closed-set consonant recognition task and an adaptive test that measured the signal to noise ratio that resulted in 50% correct identification of a set of 12 spondees presented in background noise (SNR-50). Long-duration, synthetic vowels were used to record both the cortical P1-N1-P2 “onset” response and the auditory “change” or ACC response. Correlations between the evoked potential measures and performance on the speech perception tasks are reported. Results Differences in performance using the three programming strategies were not large. Peak-to-peak amplitude of the AAC response was not found to be sensitive enough to accurately predict the programming strategy that resulted in the best performance on either measure of speech perception. All 10 Hybrid CI users had residual low frequency acoustic hearing. For all 10 subjects, allowing them to use both the acoustic and electrical signals provided by the implant improved performance on the consonant recognition task. For most subjects, it also resulted in slightly larger cortical change responses. However, the impact that listening mode had on the cortical change responses was small and again, the correlation between the evoked potential and speech perception results was not significant. Conclusions CAEPs can be successfully measured from Hybrid CI users. The responses that are recorded are similar to those recorded from normal hearing listeners. The goal of this study was to see if CAEPs might play a role either in identifying the experimental program that resulted in best performance on a consonant recognition task or documenting benefit from use of the electrical signal provided by the Hybrid CI. At least for the stimuli...

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Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 84%

Cortical Auditory Evoked Potentials Recorded From Nucleus Hybrid Cochlear Implant Users

et al. 2015

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“…This method has theoretical advantages in comparison with other frequency-lowering approaches. It does not introduce distortion of vowel formant ratios by shifting the second formant as can occur with frequency compression settings with a start frequency below 2000 Hz (Perreau et al, 2013;Kirby and Brown, 2015). It also has a narrower destination band relative to transposition, reducing the likelihood of the shifted speech sounds masking other speech information already present in that band.…”

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confidence: 99%

Listener Performance with a Novel Hearing Aid Frequency Lowering Technique

et al. 2017

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Background Sloping hearing loss imposes limits on audibility for high-frequency sounds in many hearing aid users. Signal processing algorithms that shift high-frequency sounds to lower frequencies have been introduced in hearing aids to address this challenge by improving audibility of high-frequency sounds. Purpose This study examined speech perception performance, listening effort, and subjective sound quality ratings with conventional hearing aid processing and a new frequency-lowering signal processing strategy called frequency composition (FC) in adults and children. Research Design Participants wore the study hearing aids in two signal processing conditions (conventional processing versus FC) at an initial laboratory visit and subsequently at home during two approximately six-week long trials, with the order of conditions counterbalanced across individuals in a double-blind paradigm. Study Sample Children (N = 12, 7 females, mean age in years = 12.0, SD = 3.0) and adults (N = 12, 6 females, mean age in years = 56.2, SD = 17.6) with bilateral sensorineural hearing loss who were full-time hearing aid users. Data Collection and Analyses Individual performance with each type of processing was assessed using speech perception tasks, a measure of listening effort, and subjective sound quality surveys at an initial visit. At the conclusion of each subsequent at-home trial, participants were retested in the laboratory. Linear mixed effects analyses were completed for each outcome measure with signal processing condition, age group, visit (prehome versus posthome trial), and measures of aided audibility as predictors. Results Overall, there were few significant differences in speech perception, listening effort, or subjective sound quality between FC and conventional processing, effects of listener age, or longitudinal changes in performance. Listeners preferred FC to conventional processing on one of six subjective sound quality metrics. Better speech perception performance was consistently related to higher aided audibility. Conclusions These results indicate that when high-frequency speech sounds are made audible with conventional processing, speech recognition ability and listening effort are similar between conventional processing and FC. Despite the lack of benefit to speech perception, some listeners still preferred FC, suggesting that qualitative measures should be considered when evaluating candidacy for this signal processing strategy.

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“…It can be evoked using a passive listening paradigm. It has been successfully recorded using spectrally complex acoustic stimuli presented in the sound field and processed by a hearing aid or a cochlear implant (Brown et al, 2008; Friesen & Tremblay, 2006; Kirby & Brown, 2015). Previous work from our lab and others has shown that changes in these cortical auditory evoked potentials may parallel changes in perception associated with training (Brown et al, 2014; Tremblay & Kraus, 2002).…”

Section: Training Program Evaluationmentioning

confidence: 99%

A preliminary report of music-based training for adult cochlear implant users: Rationales and development

Gfeller

Guthe²,

Driscoll

et al. 2015

Cochlear Implants International

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Objective This paper provides a preliminary report of a music-based training program for adult cochlear implant (CI) recipients. Included in this report are descriptions of the rationale for music-based training, factors influencing program development, and the resulting program components. Methods Prior studies describing experience-based plasticity in response to music training, auditory training for persons with hearing impairment, and music training for cochlear implant recipients were reviewed. These sources revealed rationales for using music to enhance speech, factors associated with successful auditory training, relevant aspects of electric hearing and music perception, and extant evidence regarding limitations and advantages associated with parameters for music training with CI users. This information formed the development of a computer-based music training program designed specifically for adult CI users. Results Principles and parameters for perceptual training of music, such as stimulus choice, rehabilitation approach, and motivational concerns were developed in relation to the unique auditory characteristics of adults with electric hearing. An outline of the resulting program components and the outcome measures for evaluating program effectiveness are presented. Conclusions Music training can enhance the perceptual accuracy of music, but is also hypothesized to enhance several features of speech with similar processing requirements as music (e.g., pitch and timbre). However, additional evaluation of specific training parameters and the impact of music-based training on speech perception of CI users are required.

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Effects of Nonlinear Frequency Compression on ACC Amplitude and Listener Performance

Cited by 15 publications

References 45 publications

Cortical Auditory Evoked Potentials Recorded From Nucleus Hybrid Cochlear Implant Users

Cortical Auditory Evoked Potentials Recorded From Nucleus Hybrid Cochlear Implant Users

Listener Performance with a Novel Hearing Aid Frequency Lowering Technique

A preliminary report of music-based training for adult cochlear implant users: Rationales and development

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