Binaural Hearing Ability With Bilateral Bone Conduction Stimulation in Subjects With Normal Hearing: Implications for Bone Conduction Hearing Aids

Zeitooni, Mehrnaz; Mäki‐Torkko, Elina; Stenfelt, Stefan

doi:10.1097/aud.0000000000000336

Cited by 26 publications

(22 citation statements)

References 33 publications

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“…6 In a follow-up study, similar binaural benefits were demonstrated with bone conduction transducers placed at the clinical BAHD position. 7 …”

Section: Discussionmentioning

confidence: 99%

“…perceiving the absolute position of a sound source), but perhaps the emergence of ITD-determined binaural disparities (i.e., “converted ILDs”) is sufficient for listeners to achieve binaural unmasking. 7 …”

Section: Discussionmentioning

confidence: 99%

“…While these benefits are clear for air conducted sound, including that conveyed by conventional hearing aids and cochlear implants, benefits of binaural hearing via bone conduction are less clear. 6, 7 …”

Section: Introductionmentioning

confidence: 99%

“…10, 11 Studies in normal-hearing listeners have also demonstrated spatial/binaural benefit with bilateral bone conduction device. 6, 7 Moreover, subjective assessments indicate that patients prefer bilateral BAHD to unilateral BAHD and report improved overall quality of life when utilizing bilateral BAHD. 12, 13 …”

Section: Introductionmentioning

confidence: 99%

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Intracochlear Measurements of Interaural Time and Level Differences Conveyed by Bilateral Bone Conduction Systems

Farrell

Hartl²,

Benichoux³

et al. 2017

Otology &Amp; Neurotology

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Hypothesis Intracochlear pressures (PIC) and stapes velocity (Vstap) elicited by bilaterally-placed bone anchored hearing devices (BAHD) will be systematically modulated by imposed interaural time (ITD) and level differences (ILD), demonstrating the potential for users of bilateral BAHD to access these binaural cues. Background BAHD are traditionally implanted unilaterally under the assumption that transcranial cross-talk limits interaural differences. Recent studies have demonstrated improvements in binaural and spatial performance with bilateral BAHD; however, objective measures of binaural cues from bilateral BAHDs are lacking. Methods Bone-conduction transducers were coupled to both mastoids of cadaveric specimens via implanted titanium abutments. PIC and Vstap were measured using intracochlear pressure probes and laser Doppler vibrometry, respectively, during stimulation with pure tone stimuli of varied frequency (250–4000 Hz) in ipsilateral, contralateral and bilateral ITD (−1 to 1 ms) and ILD (−20 to 20 dB) conditions. Results Bilateral stimulation produced constructive and destructive interference patterns that varied dramatically with ITD and stimulus frequency. Variation of ITD led to large variation of PIC and Vstap, with opposing effects in ipsilateral and contralateral ears expected to lead to “ITD to ILD conversion”. Variation of ILD produced more straightforward (monotonic) variations of PIC and Vstap, with ipsilateral-favoring ILD producing higher PIC and Vstap than contralateral-favoring. Conclusion Variation of ITDs and ILDs conveyed by BAHDs systematically modulated cochlear inputs. While transcranial cross-talk leads to complex interactions that depend on cue type and stimulus frequency, binaural disparities potentiate binaural benefit, providing a basis for improved sound localization and speech-in-noise perception.

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“…6 In a follow-up study, similar binaural benefits were demonstrated with bone conduction transducers placed at the clinical BAHD position. 7 …”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Intracochlear Measurements of Interaural Time and Level Differences Conveyed by Bilateral Bone Conduction Systems

Farrell

Hartl²,

Benichoux³

et al. 2017

Otology &Amp; Neurotology

View full text Add to dashboard Cite

show abstract

“…BCDs rely on the transmission of vibrations through the skull bone and surrounding tissues rather than via conventional air conduction (AC) pathways. When a BC stimulus is applied at one location of the skull, both the cochleae are stimulated almost simultaneously, reducing the interaural separation and decreasing the ability to extract binaural cues (Zeitooni, Maki-Torkko, and Stenfelt 2016). Due to the crosstalk between both inner ears, a degradation of SRM compared to AC stimulation is expected under BC stimulation, as seen in Stenfelt and Zeitooni (2013), where SRM for bilateral BC stimulation was approximately half of that for AC in normal hearing individuals.…”

Section: Introductionmentioning

confidence: 99%

The effect of an active transcutaneous bone conduction device on spatial release from masking

Rigato

Reinfeldt

Asp

2019

International Journal of Audiology

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Objective: The aim was to quantify the effect of the experimental active transcutaneous Bone Conduction Implant (BCI) on spatial release from masking (SRM) in subjects with bilateral or unilateral conductive and mixed hearing loss. Design: Measurements were performed in a sound booth with five loudspeakers at 0 , þ/À30 and þ/À150 azimuth. Target speech was presented frontally, and interfering speech from either the front (co-located) or surrounding (separated) loudspeakers. SRM was calculated as the difference between the separated and the co-located speech recognition threshold (SRT). Study Sample: Twelve patients (aged 22-76 years) unilaterally implanted with the BCI were included. Results: A positive SRM, reflecting a benefit of spatially separating interferers from target speech, existed for all subjects in unaided condition, and for nine subjects (75%) in aided condition. Aided SRM was lower compared to unaided in nine of the subjects. There was no difference in SRM between patients with bilateral and unilateral hearing loss. In aided situation, SRT improved only for patients with bilateral hearing loss. Conclusions: The BCI fitted unilaterally in patients with bilateral or unilateral conductive/mixed hearing loss seems to reduce SRM. However, data indicates that SRT is improved or maintained for patients with bilateral and unilateral hearing loss, respectively.

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Effect of transducer attachment on vibration transmission and transcranial attenuation for direct drive bone conduction stimulation

et al. 2019

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Binaural Hearing Ability With Bilateral Bone Conduction Stimulation in Subjects With Normal Hearing: Implications for Bone Conduction Hearing Aids

Abstract: The results confirm that binaural hearing processing with bilateral BC stimulation at the mastoid position is also present at the BCHA implant position. This indicates the ability for binaural hearing in patients with good cochlear function when using bilateral BCHAs.

Cited by 26 publications

References 33 publications

Intracochlear Measurements of Interaural Time and Level Differences Conveyed by Bilateral Bone Conduction Systems

Intracochlear Measurements of Interaural Time and Level Differences Conveyed by Bilateral Bone Conduction Systems

The effect of an active transcutaneous bone conduction device on spatial release from masking

Effect of transducer attachment on vibration transmission and transcranial attenuation for direct drive bone conduction stimulation

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