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Aronoff JM, Staisloff HE. Response to Letter to the Editor by Goupell et al. Ear Hear 2024; 45:527-528. [PMID: 38372760 PMCID: PMC11073616 DOI: 10.1097/aud.0000000000001466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2024]
Affiliation(s)
- Justin M Aronoff
- Department of Speech and Hearing Science, University of Illinois at Urbana-Champaign, Champaign, Illinois, USA
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Svirsky MA. Adaptive Procedures in Auditory Research and the Importance of Data Transparency. Ear Hear 2024; 45:522. [PMID: 38372758 DOI: 10.1097/aud.0000000000001461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2024]
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Goupell MJ, Cleary M, Bernstein JG. Letter to the Editor: Discussion of Measurement and Analysis Techniques to Estimate Interaural Place-of-Stimulation Mismatch for Binaural Perception, Re: Staisloff and Aronoff (2021). Comparing Methods for Pairing Electrodes Across Ears With Cochlear Implants, Ear Hear, 42, 1218-1227. Ear Hear 2024; 45:523-527. [PMID: 38372759 PMCID: PMC10990077 DOI: 10.1097/aud.0000000000001390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2024]
Affiliation(s)
- Matthew J. Goupell
- Department of Hearing and Speech Sciences, University of Maryland, College Park, Maryland, USA
| | - Miranda Cleary
- Department of Hearing and Speech Sciences, University of Maryland, College Park, Maryland, USA
| | - Joshua G.W. Bernstein
- National Military Audiology and Speech Center, Walter Reed National Military Medical Center, Bethesda, Maryland, USA
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Cleary M, Bernstein JGW, Stakhovskaya OA, Noble J, Kolberg E, Jensen KK, Hoa M, Kim HJ, Goupell MJ. The Relationship Between Interaural Insertion-Depth Differences, Scalar Location, and Interaural Time-Difference Processing in Adult Bilateral Cochlear-Implant Listeners. Trends Hear 2022; 26:23312165221129165. [PMID: 36379607 PMCID: PMC9669699 DOI: 10.1177/23312165221129165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Sensitivity to interaural time differences (ITDs) in acoustic hearing involves comparison of interaurally frequency-matched inputs. Bilateral cochlear-implant arrays are, however, only approximately aligned in angular insertion depth and scalar location across the cochleae. Interaural place-of-stimulation mismatch therefore has the potential to impact binaural perception. ITD left-right discrimination thresholds were examined in 23 postlingually-deafened adult bilateral cochlear-implant listeners, using low-rate constant-amplitude pulse trains presented via direct stimulation to single electrodes in each ear. Angular insertion depth and scalar location measured from computed-tomography (CT) scans were used to quantify interaural mismatch, and their association with binaural performance was assessed. Number-matched electrodes displayed a median interaural insertion-depth mismatch of 18° and generally yielded best or near-best ITD discrimination thresholds. Two listeners whose discrimination thresholds did not show this pattern were confirmed via CT to have atypical array placement. Listeners with more number-matched electrode pairs located in the scala tympani displayed better thresholds than listeners with fewer such pairs. ITD tuning curves as a function of interaural electrode separation were broad; bandwidths at twice the threshold minimum averaged 10.5 electrodes (equivalent to 5.9 mm for a Cochlear-brand pre-curved array). Larger angular insertion-depth differences were associated with wider bandwidths. Wide ITD tuning curve bandwidths appear to be a product of both monopolar stimulation and angular insertion-depth mismatch. Cases of good ITD sensitivity with very wide bandwidths suggest that precise matching of insertion depth is not critical for discrimination thresholds. Further prioritizing scala tympani location at implantation should, however, benefit ITD sensitivity.
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Affiliation(s)
- Miranda Cleary
- Department of Hearing and Speech Sciences, University of Maryland, College Park, MD, USA
| | - Joshua G. W. Bernstein
- National Military Audiology and Speech Pathology Center, Walter Reed National Military Medical
Center, Bethesda, MD, USA
| | - Olga A. Stakhovskaya
- Department of Hearing and Speech Sciences, University of Maryland, College Park, MD, USA
| | - Jack Noble
- Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN, USA,Department of Hearing and Speech Sciences, Vanderbilt University
Medical Center, Nashville, TN, USA,Department of Otolaryngology, Vanderbilt University Medical Center,
Nashville, TN, USA
| | - Elizabeth Kolberg
- Department of Hearing and Speech Sciences, University of Maryland, College Park, MD, USA
| | - Kenneth K. Jensen
- National Military Audiology and Speech Pathology Center, Walter Reed National Military Medical
Center, Bethesda, MD, USA
| | - Michael Hoa
- Department of Otolaryngology-Head and Neck Surgery, Georgetown University Medical
Center, Washington, DC, USA
| | - Hung Jeffrey Kim
- Department of Otolaryngology-Head and Neck Surgery, Georgetown University Medical
Center, Washington, DC, USA
| | - Matthew J. Goupell
- Department of Hearing and Speech Sciences, University of Maryland, College Park, MD, USA,Matthew J. Goupell, Department of Hearing
and Speech Sciences, University of Maryland, College Park, MD 20742, USA.
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Pieper SH, Hamze N, Brill S, Hochmuth S, Exter M, Polak M, Radeloff A, Buschermöhle M, Dietz M. Considerations for Fitting Cochlear Implants Bimodally and to the Single-Sided Deaf. Trends Hear 2022; 26:23312165221108259. [PMID: 35726211 PMCID: PMC9218456 DOI: 10.1177/23312165221108259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
When listening with a cochlear implant through one ear and acoustically through the other, binaural benefits and spatial hearing abilities are generally poorer than in other bilaterally stimulated configurations. With the working hypothesis that binaural neurons require interaurally matched inputs, we review causes for mismatch, their perceptual consequences, and experimental methods for mismatch measurements. The focus is on the three primary interaural dimensions of latency, frequency, and level. Often, the mismatch is not constant, but rather highly stimulus-dependent. We report on mismatch compensation strategies, taking into consideration the specific needs of the respective patient groups. Practical challenges typically faced by audiologists in the proposed fitting procedure are discussed. While improvement in certain areas (e.g., speaker localization) is definitely achievable, a more comprehensive mismatch compensation is a very ambitious endeavor. Even in the hypothetical ideal fitting case, performance is not expected to exceed that of a good bilateral cochlear implant user.
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Affiliation(s)
- Sabrina H Pieper
- Department of Medical Physics and Acoustic, University of Oldenburg, Oldenburg, Germany.,Cluster of Excellence Hearing4all, University of Oldenburg, Oldenburg, Germany
| | - Noura Hamze
- MED-EL Medical Electronics GmbH, Innsbruck, Austria
| | - Stefan Brill
- MED-EL Medical Electronics Germany GmbH, Starnberg, Germany
| | - Sabine Hochmuth
- Division of Otorhinolaryngology, University of Oldenburg, Oldenburg, Germany
| | - Mats Exter
- Cluster of Excellence Hearing4all, University of Oldenburg, Oldenburg, Germany.,Hörzentrum Oldenburg gGmbH, Oldenburg, Germany
| | - Marek Polak
- MED-EL Medical Electronics GmbH, Innsbruck, Austria
| | - Andreas Radeloff
- Cluster of Excellence Hearing4all, University of Oldenburg, Oldenburg, Germany.,Division of Otorhinolaryngology, University of Oldenburg, Oldenburg, Germany.,Research Center Neurosensory Science, University of Oldenburg, Oldenburg, Germany
| | | | - Mathias Dietz
- Department of Medical Physics and Acoustic, University of Oldenburg, Oldenburg, Germany.,Cluster of Excellence Hearing4all, University of Oldenburg, Oldenburg, Germany.,Research Center Neurosensory Science, University of Oldenburg, Oldenburg, Germany
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