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Introduction: Bimodal listeners combine a cochlear implant (CI) with a contralateral hearing aid (HA). Psychoacoustic research shows that bimodal listening can improve speech perception in noise, sound localization, and music appreciation. Nevertheless, a substantial proportion of bimodal listeners cease to wear the HA shortly after implantation. To date, there is no consensus on whether or not bimodal listening is preferred in a given individual or population. This study examines whether endogenous auditory evoked cortical responses can be used to assess bimodal benefit. Methods: Six experienced CI-users were included in the study. Three used a HA in daily life, whereas the others did not wear a HA. All subjects were implanted with either the Nucleus CI24RE(CA) or CI422 and had low-frequency residual hearing in the non-implanted ear. The cognitive P300 response was elicited using an oddball paradigm with a 500 Hz tone-burst as the standard and a 250 Hz tone-burst as the deviant stimulus. P300s were recorded in the CI-only (i.e. with the contralateral ear plugged) and the bimodal condition (i.e. CI and HA or CI and residual hearing, depending on the subject’s daily use). Results: Overall, P300 morphology was clearer in the bimodal compared to the CI-only condition. Amplitudes in the bimodal and CI-only condition were respectively 17.39 μV and 11.63 μV. Latencies were 262 ms (SD 30.0 ms) in the bimodal and 281 ms (SD 49.2 ms) in the CI-only condition. Interestingly, the trend of shorter latencies for the bimodal compared to the CI-only condition was only observed in the subjects who wear a HA in daily life. Conclusion: Preliminary data reveal that the bimodal condition elicited better P300 responses than the CI-only condition, especially in subjects who wear a hearing aid in daily life.

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Chicago
Van Yper, Lindsey, Andy Beynon, KATRIEN VERMEIRE, and Ingeborg Dhooge. 2015. “P300 in Bimodal CI-users.” In Implantable Auditory Prostheses, Conference Abstracts.
APA
Van Yper, L., Beynon, A., VERMEIRE, K., & Dhooge, I. (2015). P300 in bimodal CI-users. Implantable Auditory Prostheses, Conference abstracts. Presented at the 2015 Conference on Implantable Auditory Prostheses (CIAP).
Vancouver
1.
Van Yper L, Beynon A, VERMEIRE K, Dhooge I. P300 in bimodal CI-users. Implantable Auditory Prostheses, Conference abstracts. 2015.
MLA
Van Yper, Lindsey, Andy Beynon, KATRIEN VERMEIRE, et al. “P300 in Bimodal CI-users.” Implantable Auditory Prostheses, Conference Abstracts. 2015. Print.
@inproceedings{7088787,
  abstract     = {Introduction: Bimodal listeners combine a cochlear implant (CI) with a contralateral hearing aid (HA). Psychoacoustic research shows that bimodal listening can improve speech perception in noise, sound localization, and music appreciation. Nevertheless, a substantial proportion of bimodal listeners cease to wear the HA shortly after implantation. To date, there is no consensus on whether or not bimodal listening is preferred in a given individual or population. This study examines whether endogenous auditory evoked cortical responses can be used to assess bimodal benefit.
Methods: Six experienced CI-users were included in the study. Three used a HA in daily life, whereas the others did not wear a HA. All subjects were implanted with either the Nucleus CI24RE(CA) or CI422 and had low-frequency residual hearing in the non-implanted ear. The cognitive P300 response was elicited using an oddball paradigm with a 500 Hz tone-burst as the standard and a 250 Hz tone-burst as the deviant stimulus. P300s were recorded in the CI-only (i.e. with the contralateral ear plugged) and the bimodal condition (i.e. CI and HA or CI and residual hearing, depending on the subject{\textquoteright}s daily use).
Results: Overall, P300 morphology was clearer in the bimodal compared to the CI-only condition. Amplitudes in the bimodal and CI-only condition were respectively 17.39 \ensuremath{\mu}V and 11.63 \ensuremath{\mu}V. Latencies were 262 ms (SD 30.0 ms) in the bimodal and 281 ms (SD 49.2 ms) in the CI-only condition. Interestingly, the trend of shorter latencies for the bimodal compared to the CI-only condition was only observed in the subjects who wear a HA in daily life.
Conclusion: Preliminary data reveal that the bimodal condition elicited better P300 responses than the CI-only condition, especially in subjects who wear a hearing aid in daily life.},
  author       = {Van Yper, Lindsey and Beynon, Andy and VERMEIRE, KATRIEN and Dhooge, Ingeborg},
  booktitle    = {Implantable Auditory Prostheses, Conference abstracts},
  language     = {eng},
  location     = {Lake Tahoe, CA, USA},
  title        = {P300 in bimodal CI-users},
  year         = {2015},
}