Characteristics of stimulus artifacts in EEG recordings induced by electrical stimulation of cochlear implants

Li, Xiaoxia; Nie, Kaibao; Karp, Floyd; Tremblay, Kelly L.; Rubinstein, Jay T.

doi:10.1109/bmei.2010.5639942

Cited by 10 publications

(5 citation statements)

References 25 publications

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“…In the case of fMRI, no ferromagnetic metals are permitted near fMRI scanners, precluding the wearing of most hearing instruments during testing. Similarly, EEG signals are susceptible to electromagnetic field interference from nearby devices, including cochlear implants (Li, Nie, Karp, Tremblay, & Rubinstein, 2010) and hearing aids (Ohlenforst et al., 2017). Although EEG signal-processing measures have been developed to deal with stimulus transduction artifacts (Campbell, Kerlin, Bishop, & Miller, 2012; K. Kim et al., 2015), questions regarding stimulus artifacts can limit interpretation of results and it is not practical to implement these techniques in a clinical setting.…”

Section: Introductionmentioning

confidence: 99%

Functional Near-Infrared Spectroscopy as a Measure of Listening Effort in Older Adults Who Use Hearing Aids

et al. 2019

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Listening effort may be reduced when hearing aids improve access to the acoustic signal. However, this possibility is difficult to evaluate because many neuroimaging methods used to measure listening effort are incompatible with hearing aid use. Functional near-infrared spectroscopy (fNIRS), which can be used to measure the concentration of oxygen in the prefrontal cortex (PFC), appears to be well-suited to this application. The first aim of this study was to establish whether fNIRS could measure cognitive effort during listening in older adults who use hearing aids. The second aim was to use fNIRS to determine if listening effort, a form of cognitive effort, differed depending on whether or not hearing aids were used when listening to sound presented at 35 dB SL (flat gain). Sixteen older adults who were experienced hearing aid users completed an auditory n-back task and a visual n-back task; both tasks were completed with and without hearing aids. We found that PFC oxygenation increased with n-back working memory demand in both modalities, supporting the use of fNIRS to measure cognitive effort during listening in this population. PFC oxygenation was weakly and nonsignificantly correlated with self-reported listening effort and reaction time, respectively, suggesting that PFC oxygenation assesses a dimension of listening effort that differs from these other measures. Furthermore, the extent to which hearing aids reduced PFC oxygenation in the left lateral PFC was positively correlated with age and pure-tone average thresholds. The implications of these findings as well as future directions are discussed.

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Section: Introductionmentioning

confidence: 99%

Functional Near-Infrared Spectroscopy as a Measure of Listening Effort in Older Adults Who Use Hearing Aids

et al. 2019

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“…It is not unexpected that BP would result in responses with smaller amplitude-BAR given that the reference electrode is intra-cochlear, which would restrict current flow within the cochlea, as opposed to MP processing where the reference electrode is extra-cochlear (located in the implant receiver/stimulator), and current flows between the intra-cochlear and extra-cochlear electrodes. Li et al (2010) also found that CI artefacts were smaller in BP versus MP processing when they recorded CI artefacts from an implanted chicken carcase. Although responses from participants with Cochlear Nucleus 22 implants were the appropriate amplitude-BAR and amplitude-PAR plus resembled speech-ABRs, it was difficult to conclude whether responses were artefacts or brainstem responses.…”

Section: Discussionmentioning

confidence: 87%

“…CI artefacts from Cochlear Nucleus CIs follow the stimulus envelope (Wagner et al 2018), which would result in waveforms that may resemble speech-ABRs. Given the smaller amplitude CI artefact (Li et al 2010) and that CI artefacts from Cochlear Nucleus CIs follow the stimulus envelope (Wagner et al 2018), it is more likely that responses recorded from participants with Cochlear Nucleus 22 CIs are artefacts rather than speech-ABRs. Second, Cochlear Nucleus 24 CIs (ACE and MP) resulted in responses that followed the 40 ms [da] envelope.…”

Section: Discussionmentioning

confidence: 99%

Speech-ABRs in cochlear implant recipients: feasibility study

BinKhamis

Perugia

O’Driscoll

et al. 2019

International Journal of Audiology

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Objective: The aim of this study was to assess the feasibility of recording speech-ABRs from cochlear implant (CI) recipients, and to remove the artefact using a clinically applicable single-channel approach. Design: Speech-ABRs were recorded to a 40 ms [da] presented via loudspeaker using a two-channel electrode montage. Additionally, artefacts were recorded using an artificial-head incorporating a MED-EL CI with stimulation parameters as similar as possible to those of three MED-EL participants. A single-channel artefact removal technique was applied to all responses. Study sample: A total of 12 adult CI recipients (6 Cochlear Nucleus and 6 MED-EL CIs). Results: Responses differed according to the CI type, artefact removal resulted in responses containing speech-ARB characteristics in two MED-EL CI participants; however, it was not possible to verify whether these were true responses or were modulated by artefacts, and artefact removal was successful from the artificial-head recordings. Conclusions: This is the first study that attempted to record speech-ABRs from CI recipients. Results suggest that there is a potential for application of a single-channel approach to artefact removal. However, a more robust and adaptive approach to artefact removal that includes a method to verify true responses is needed.

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“…The nature of the CI stimulation artifacts varies over subjects and depends on stimulation and recording parameters. CI stimulation artifacts are typically larger and longer in duration for monopolar mode stimulation than for bipolar mode stimulation [15], [16], and are therefore more difficult to remove. CI stimulation artifacts, shown in Figure 1 have been characterized in [17], for stimulation and recording parameters that are often used.…”

Section: Introductionmentioning

confidence: 99%

Template Subtraction to Remove CI Stimulation Artifacts in Auditory Steady-State Responses in CI Subjects

Deprez

Gransier

Hofmann

et al. 2017

IEEE Trans. Neural Syst. Rehabil. Eng.

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Cochlear implant (CI) stimulation artifacts are currently removed from electrically evoked steady-state response (EASSR) measurements based on a linear interpolation (LI) over the artifact-contaminated signal parts. LI is only successful if CI stimulation artifacts are shorter than the interpulse interval, i.e., for contralateral channels and stimulation pulse rates up to 500 pulses per second (pps). The objective of this paper is to develop and evaluate a template subtraction (TS) method to remove continuous CI stimulation artifacts in order to accurately measure EASSRs. The template construction (TC) is based on an EEG recording containing CI stimulation artifacts but no synchronous neural response. The constructed templates are subtracted from the recording of interest. Response amplitudes and latencies are compared for the TS and LI method, and for different TC durations. The response amplitudes and latencies in contralateral channels are the same after TS and LI, as expected. In ipsilateral channels, response amplitudes and latencies are within the expected range only after TS. The TC duration can be reduced from 5 min to 1 min without a significant effect on response latency. TS with a TC duration of only 1 min allows to remove all CI stimulation artifacts in individual contra- and ipsilateral EEG recording channels.

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Characteristics of stimulus artifacts in EEG recordings induced by electrical stimulation of cochlear implants

Cited by 10 publications

References 25 publications

Functional Near-Infrared Spectroscopy as a Measure of Listening Effort in Older Adults Who Use Hearing Aids

Functional Near-Infrared Spectroscopy as a Measure of Listening Effort in Older Adults Who Use Hearing Aids

Speech-ABRs in cochlear implant recipients: feasibility study

Template Subtraction to Remove CI Stimulation Artifacts in Auditory Steady-State Responses in CI Subjects

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