Effects of Extreme Tonotopic Mismatches Between Bilateral Cochlear Implants on Electric Pitch Perception: A Case Study

Reiss, Lina A. J.; Lowder, Mary W.; Karsten, Sue A.; Turner, Christopher W.; Gantz, Bruce J.

doi:10.1097/aud.0b013e31820c81b0

Cited by 36 publications

(40 citation statements)

References 21 publications

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“…However, not all patients adapt to reduce this mismatch. Bimodal CI users are more likely to experience no changes in pitch or even a drop in pitch for all electrodes, exacerbating the mismatch (Reiss et al 2007(Reiss et al , 2011(Reiss et al , 2012a; consistent with this finding, several long-term studies also found electrode pitch to be mismatched to and lower than the frequency-toelectrode allocations (e.g., Blamey et al 1996;Dorman et al 2007). For bimodal CI users, it is possible that instead of or in addition to adapting pitch, the brain adapts BSI to increase fusion of interaurally mismatched inputs to effectively reduce the perception of mismatch.…”

Section: Introductionsupporting

confidence: 62%

“…For Hybrid CI users, electrode pitch perception changes relative to contralateral acoustic pitch over time, and the changes tend to occur in the direction of reducing perceived interaural pitch mismatch (Reiss et al 2007(Reiss et al , 2011. Analogous adaptations in auditory or visual receptive fields have been reported in response to auditory-visual mismatch, such as after months of experience with displacing prisms in the barn owl (Knudsen 2002) or on the time scale of seconds with the ventriquolism aftereffect (Recanzone 1998).…”

Section: Dichotic Fusion Rangesmentioning

confidence: 94%

“…Our previous studies have shown that Hybrid CI users who wear HAs in both ears or a second CI in the contralateral ear can adapt pitch perception over months of experience to reduce any perceived pitch mismatch between acoustic and electric inputs arising from this tonotopic mismatch (Reiss et al 2007(Reiss et al , 2011. However, not all patients adapt to reduce this mismatch.…”

Section: Introductionmentioning

confidence: 99%

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Abnormal Binaural Spectral Integration in Cochlear Implant Users

Reiss

Ito

Eggleston

et al. 2014

JARO

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Bimodal stimulation, or stimulation of a cochlear implant (CI) together with a contralateral hearing aid (HA), can improve speech perception in noise However, this benefit is variable, and some individuals even experience interference with bimodal stimulation. One contributing factor to this variability may be differences in binaural spectral integration (BSI) due to abnormal auditory experience. CI programming introduces interaural pitch mismatches, in which the frequencies allocated to the electrodes (and contralateral HA) differ from the electrically stimulated cochlear frequencies. Previous studies have shown that some, but not all, CI users adapt pitch perception to reduce this mismatch. The purpose of this study was to determine whether broadened BSI may also reduce the perception of mismatch. Interaural pitch mismatches and dichotic pitch fusion ranges were measured in 21 bimodal CI users. Seventeen subjects with wide fusion ranges also conducted a task to pitch match various fused electrode-tone pairs. All subjects showed abnormally wide dichotic fusion frequency ranges of 1-4 octaves. The fusion range size was weakly correlated with the interaural pitch mismatch, suggesting a link between broad binaural pitch fusion and large interaural pitch mismatch. Dichotic pitch averaging was also observed, in which a new binaural pitch resulted from the fusion of the original monaural pitches, even when the pitches differed by as much as 3-4 octaves. These findings suggest that abnormal BSI, indicated by broadened fusion ranges and spectral averaging between ears, may account for speech perception interference and nonoptimal integration observed with bimodal compared with monaural hearing device use.

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Section: Introductionsupporting

confidence: 62%

Section: Dichotic Fusion Rangesmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Abnormal Binaural Spectral Integration in Cochlear Implant Users

Reiss

Ito

Eggleston

et al. 2014

JARO

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“…Indeed, the results of previous studies on the effect of electrode array length have been controversial [Boyd, 2011;Esquia Medina et al, 2013;Holden et al, 2013]. While some authors argue against short electrode arrays compromising auditory outcome [Reiss et al, 2011[Reiss et al, , 2014, others have reported higher speech perception outcome with longer electrode arrays, with subsequent residual hearing preservation [Esquia Medina et al, 2013;Usami et al, 2011].…”

Section: Introductionmentioning

confidence: 96%

“…Frequency allocation maps of cochlear implants are rarely adapted to either the insertion depth of electrode arrays or the individual variations in cochlear size. Such lack of adaptation may result in disagreement between the implant's frequency allocation map and the characteristic frequency of the auditory neurons in closest vicinity to each electrode contact [Baumann et al, 2011;Blamey et al, 1996;Boex et al, 2006;Di Nardo et al, 2010;McDermott et al, 2009;Reiss et al, 2011].…”

Section: Introductionmentioning

confidence: 99%

Effects of Electrode Array Length on Frequency-Place Mismatch and Speech Perception with Cochlear Implants

et al. 2015

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Frequency-place mismatch often occurs after cochlear implantation, yet its effect on speech perception outcome remains unclear. In this article, we propose a method, based on cochlea imaging, to determine the cochlear place-frequency map. We evaluated the effect of frequency-place mismatch on speech perception outcome in subjects implanted with 3 different lengths of electrode arrays. A deeper insertion was responsible for a larger frequency-place mismatch and a decreased and delayed speech perception improvement by comparison with a shallower insertion, for which a similar but slighter effect was noticed. Our results support the notion that selecting an electrode array length adapted to each individual's cochlear anatomy may reduce frequency-place mismatch and thus improve speech perception outcome.

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Two Ears Are Not Always Better than One: Mandatory Vowel Fusion Across Spectrally Mismatched Ears in Hearing-Impaired Listeners

Reiss

Eggleston

Walker

et al. 2016

JARO

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Hearing loss and auditory prostheses can alter auditory processing by inducing large pitch mismatches and broad pitch fusion between the two ears. Similar to integration of incongruent inputs in other sensory modalities, the mismatched, fused pitches are often averaged across ears for simple stimuli. Here, we measured parallel effects on complex stimulus integration using a new technique based on vowel classification in five bilateral hearing aid users and eight bimodal cochlear implant users. Continua between five pairs of synthetic vowels were created by varying the first formant spectral peak while keeping the second formant constant. Comparison of binaural and monaural vowel classification functions for each vowel pair continuum enabled visualization of the following frequency-dependent integration trends: (1) similar monaural and binaural functions, (2) ear dominance, (3) binaural averaging, and (4) binaural interference. Hearing aid users showed all trends, while bimodal cochlear implant users showed mostly ear dominance or interference. Interaural pitch mismatches, frequency ranges of binaural pitch fusion, and the relative weightings of pitch averaging across ears were also measured using tone and/or electrode stimulation. The presence of both large interaural pitch mismatches and broad pitch fusion was not sufficient to predict vowel integration trends such as binaural averaging or interference. The way that pitch averaging was weighted between ears also appears to be important for determining binaural vowel integration trends. Abnormally broad spectral fusion and the associated phoneme fusion across mismatched ears may underlie binaural speech perception interference observed in hearing aid and cochlear implant users.

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Effects of Extreme Tonotopic Mismatches Between Bilateral Cochlear Implants on Electric Pitch Perception: A Case Study

Cited by 36 publications

References 21 publications

Abnormal Binaural Spectral Integration in Cochlear Implant Users

Abnormal Binaural Spectral Integration in Cochlear Implant Users

Effects of Electrode Array Length on Frequency-Place Mismatch and Speech Perception with Cochlear Implants

Two Ears Are Not Always Better than One: Mandatory Vowel Fusion Across Spectrally Mismatched Ears in Hearing-Impaired Listeners

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