Evaluation of evoked potentials to dyadic tones after cochlear implantation

Sandmann, Pascale; Eichele, Tom; Buechler, Michael; Debener, Stefan; Jäncke, Lutz; Dillier, Norbert; Hugdahl, Kenneth; Meyer, Martin

doi:10.1093/brain/awp034

Cited by 64 publications

(99 citation statements)

References 67 publications

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“…This confirms previous research which reported differences in the sensory processing of auditory stimuli in CI users and NH listeners [Finke et al, 2015;Finke et al, 2016;Oates et al, 2002;Sandmann et al, 2009Sandmann et al, , 2010Sandmann et al, , 2015.…”

Section: Behavioral Resultssupporting

confidence: 91%

“…Independent components reflecting eye blinks, horizontal eye movements, and CI artifacts were removed [Jung et al, 2000a, b]. Components representing CI artifacts were identified by the centroid on the side of the implanted device and by the time course of component activity, which typically showed a sharp onset around 30 ms after stimulus onset (for details about the reduction of CI artifacts by means of independent component analysis, see Debener et al [2008], Sandmann et al [2009], and Viola et al [2011]). Then, missing channels located in proximity to the speech processor and transmitter coil were interpolated using spherical spline interpolation (mean number of missing electrodes: 6.3; SD: 2.11; range: 3-10 [Perrin et al, 1989]).…”

Section: Data Recording and Analysismentioning

confidence: 99%

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Consequences of Stimulus Type on Higher-Order Processing in Single-Sided Deaf Cochlear Implant Users

et al. 2016

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Single-sided deaf subjects with a cochlear implant (CI) provide the unique opportunity to compare central auditory processing of the electrical input (CI ear) and the acoustic input (normal-hearing, NH, ear) within the same individual. In these individuals, sensory processing differs between their two ears, while cognitive abilities are the same irrespectively of the sensory input. To better understand perceptual-cognitive factors modulating speech intelligibility with a CI, this electroencephalography study examined the central-auditory processing of words, the cognitive abilities, and the speech intelligibility in 10 postlingually single-sided deaf CI users. We found lower hit rates and prolonged response times for word classification during an oddball task for the CI ear when compared with the NH ear. Also, event-related potentials reflecting sensory (N1) and higher-order processing (N2/N4) were prolonged for word classification (targets versus nontargets) with the CI ear compared with the NH ear. Our results suggest that speech processing via the CI ear and the NH ear differs both at sensory (N1) and cognitive (N2/N4) processing stages, thereby affecting the behavioral performance for speech discrimination. These results provide objective evidence for cognition to be a key factor for speech perception under adverse listening conditions, such as the degraded speech signal provided from the CI.

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Section: Behavioral Resultssupporting

confidence: 91%

Section: Data Recording and Analysismentioning

confidence: 99%

Consequences of Stimulus Type on Higher-Order Processing in Single-Sided Deaf Cochlear Implant Users

et al. 2016

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“…Independent components reflecting eye-blinks, horizontal eye movements, electrical heartbeat activity and CI artifacts were removed (Jung et al, 2000a(Jung et al, , 2000b. Components representing CI artifacts were identified by the centroid on the side of the implanted device and by the time course of component activity (for details about the reduction of CI artifacts by means of ICA see (Debener et al, 2008;Sandmann et al, 2009;Viola et al, 2011)). After removal of artifact-related ICA components, channels which were missing due to the speech processor and transmitter coil were interpolated.…”

Section: Electrophysiological Data: Recording and Data Processingmentioning

confidence: 99%

“…Among the long-latency ERPs, the N1-P2 complex seems to be particularly useful to study auditory processing because it can be evoked by a variety of stimuli. Alterations in long-latency ERPs have been reported for subject populations who experience perception difficulties, among them individuals with hearing impairment and CI users (Oates et al, 2002;Sandmann et al, 2009). Moreover, the N1-P2 complex is modulated by background noise.…”

Section: Introductionmentioning

confidence: 99%

On the relationship between auditory cognition and speech intelligibility in cochlear implant users: An ERP study

et al. 2016

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There is a high degree of variability in speech intelligibility outcomes across cochlear-implant (CI) users. To better understand how auditory cognition affects speech intelligibility with the CI, we performed an electroencephalography study in which we examined the relationship between central auditory processing, cognitive abilities, and speech intelligibility. Postlingually deafened CI users (N=13) and matched normal-hearing (NH) listeners (N=13) performed an oddball task with words presented in different background conditions (quiet, stationary noise, modulated noise). Participants had to categorize words as living (targets) or non-living entities (standards). We also assessed participants' working memory (WM) capacity and verbal abilities. For the oddball task, we found lower hit rates and prolonged response times in CI users when compared with NH listeners. Noise-related prolongation of the N1 amplitude was found for all participants. Further, we observed group-specific modulation effects of event-related potentials (ERPs) as a function of background noise. While NH listeners showed stronger noise-related modulation of the N1 latency, CI users revealed enhanced modulation effects of the N2/N4 latency. In general, higher-order processing (N2/N4, P3) was prolonged in CI users in all background conditions when compared with NH listeners. Longer N2/N4 latency in CI users suggests that these individuals have difficulties to map acoustic-phonetic features to lexical representations. These difficulties seem to be increased for speech-in-noise conditions when compared with speech in quiet background. Correlation analyses showed that shorter ERP latencies were related to enhanced speech intelligibility (N1, N2/N4), better lexical fluency (N1), and lower ratings of listening effort (N2/N4) in CI users. In sum, our findings suggest that CI users and NH listeners differ with regards to both the sensory and the higher-order processing of speech in quiet as well as in noisy background conditions. Our results also revealed that verbal abilities are related to speech processing and speech intelligibility in CI users, confirming the view that auditory cognition plays an important role for CI outcome. We conclude that differences in auditory-cognitive processing contribute to the variability in speech performance outcomes observed in CI users. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Hannover, Finke.Mareike@mh-hannover.de AbstractThere is a high degree of variability in speech intelligibility outcomes across cochlear-implant (CI) users. To better understand how auditory cognition aff...

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“…As it is evoked by the onset of a pitch and its morphology is different from an N100 response, this IRN onset response was labeled as pitch onset response (POR) [Krumbholz et al, 2003]. In contrast to magnetoencephalographic recordings, auditory-evoked potentials have been recorded by EEGs in CI users [Kraus et al, 1993;Debener et al, 2007;Sandmann et al, 2009;Rahne et al, 2014]. Equivalent to the POR, the acoustic change complex was evoked by a slight change to the fundamental frequency of a vowel stimulus and measured successfully in 1 CI user by Martin [2007].…”

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confidence: 99%

Perception of Iterated Rippled Noise Periodicity in Cochlear Implant Users

Wagner

Plontke²,

Rahne³

2017

Audiol Neurotol

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Pitch perception is more challenging for individuals with cochlear implants (CIs) than normal-hearing subjects because the signal processing by CIs is restricted. Processing and perceiving the periodicity of signals may contribute to pitch perception. Whether individuals with CIs can discern pitch within an iterated rippled noise (IRN) signal is still unclear. In a prospective controlled psychoacoustic study with 34 CI users and 15 normal-hearing control subjects, the difference limen between IRN signals with different numbers of iterations was measured. In 7 CI users and 15 normal-hearing control listeners with single-sided deafness, pitch matching between IRN and harmonic complex tones was measured. The pitch onset response (POR) following signal changes from white noise to IRN was measured electrophysiologically. The CI users could discriminate different numbers of iteration in IRN signals, but worse than normal-hearing listeners. A POR was measured for both normal-hearing subjects and CI users increasing with the pitch salience of the IRN. This indicates that the POR could serve as an objective measure to monitor progress during audioverbal therapy after CI surgery.

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Evaluation of evoked potentials to dyadic tones after cochlear implantation

Cited by 64 publications

References 67 publications

Consequences of Stimulus Type on Higher-Order Processing in Single-Sided Deaf Cochlear Implant Users

Consequences of Stimulus Type on Higher-Order Processing in Single-Sided Deaf Cochlear Implant Users

On the relationship between auditory cognition and speech intelligibility in cochlear implant users: An ERP study

Perception of Iterated Rippled Noise Periodicity in Cochlear Implant Users

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