Transmission of bone conducted sound – Correlation between hearing perception and cochlear vibration

Eeg-Olofsson, Måns; Stenfelt, Stefan; Taghavi, Hamidreza; Reinfeldt, Sabine; Hȧkansson, Bo; Tengstrand, Tomas; Finizia, Chatarina

doi:10.1016/j.heares.2013.08.015

Cited by 75 publications

(71 citation statements)

References 36 publications

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“…Most BC vibration data were obtained in cadaver heads (Eeg-Olofsson et al, 2008;Stenfelt et al, 2005a) but live human data were also used (Eeg-Olofsson et al, 2013). Moreover, hearing threshold data were from measurements in live humans.…”

Section: Relative Importance Of the Five Componentsmentioning

confidence: 99%

Model predictions for bone conduction perception in the human

Stenfelt

2016

Hearing Research

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Five different pathways are often suggested as important for bone conducted (BC) sound: (1) sound pressure in the ear canal, (2) inertia of the middle ear ossicles, (3) inertia of the inner ear fluid, (4) compression of the inner ear space, and (5) pressure transmission from the skull interior. The relative importance of these pathways was investigated with an acousticimpedance model of the inner ear. The model incorporated data of BC generated ear canal sound pressure, middle ear ossicle motion, cochlear promontory vibration, and intracranial sound pressure. With BC stimulation at the mastoid, the inner ear inertia dominated the excitation of the cochlea but inner ear compression and middle ear inertia were within 10 dB for almost the entire frequency range of 0.1 to 10 kHz. Ear canal sound pressure gave little contribution at the low and high frequencies, but was around 15 dB below the total contribution at the mid frequencies. Intracranial sound pressure gave responses similar to the others at low frequencies, but decreased with frequency to a level of 55 dB below the total contribution at 10 kHz. When the BC inner ear model was evaluated against AC stimulation at threshold levels, the results were close up to approximately 4 kHz but deviated significantly at higher frequencies. 3 Highlights• A model for BC simulates the contribution from 5 components.• The inner ear compression and inertia and middle ear inertia are most important.• The contribution from intracranial sound pressure is insignificant at higher frequencies.• The model provides similar BM excitation for AC and BC threshold stimulation up to 4 kHz. KeywordsBone conduction, inner ear model, fluid inertia, inner ear compression, middle ear inertia

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Section: Relative Importance Of the Five Componentsmentioning

confidence: 99%

Model predictions for bone conduction perception in the human

Stenfelt

2016

Hearing Research

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“…The interaction of these pathways is not fully understood. Osseous pathways were assessed in this study by measuring promontory vibration (Eeg-Olofsson et al, 2013), while non-osseous pathways were measured by recording intracranial sound pressure for two simulation conditions. In the first condition, the BC transducer was screwed to the mastoid; in the second, it was held against the dura by an elastic band.…”

Section: Discussionmentioning

confidence: 99%

“…Osseous pathways can be investigated by measuring bone vibrations at the cochlear promontory (Eeg-Olofsson et al, 2013), and non-osseous pathways can be assessed by measuring intracranial sound pressure in the head. The aim of this study was to investigate the interaction between non-osseous and osseous pathways following stimulation with a BC transducer by comparing the relation between bone vibrations measured at the cochlear promontory and intracranial sound pressure for stimulation on the dura and on the mastoid (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Interaction between osseous and non-osseous vibratory stimulation of the human cadaveric head

et al. 2016

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Bone conduction (BC) stimulation can be applied by vibration to the bony or skin covered skull (osseous BC), or on soft tissue such as the neck (non-osseous BC). The interaction between osseous and non-osseous bone conduction pathways is assessed in this study. The relation between bone vibrations measured at the cochlear promontory and the intracranial sound pressure for stimulation directly on the dura and for stimulation at the mastoid between 0.2 and 10 kHz was compared. First, for stimulation on the dura, varying the static coupling force of the BC transducer on the dura had only a small effect on promontory vibration. Second, the presence or absence of intracranial fluid did not affect promontory vibration for stimulation on the dura. Third, stimulation on the mastoid elicited both promontory vibration and intracranial sound pressure. Stimulation on the dura caused intracranial sound pressure to a similar extent above 0.5 kHz compared to stimulation on the mastoid, while promontory vibration was less by 20-40 dB. From these findings, we conclude that intracranial sound pressure (non-osseous BC) only marginally affects bone vibrations measured on the promontory (osseous BC), whereas skull vibrations affect intracranial sound pressure. HIGHLIGHTS:• Promontory vibration (osseous bone conduction) and intracranial sound pressure (nonosseous bone conduction) were measured in human cadaveric whole heads in response to bone-conducted sound.• A bone conduction stimulator was attached either to the mastoid and placed on the dura without contacting surrounding bone.• Intracranial sound pressure was comparable > 500 Hz for both modes of stimulation.• Promontory vibration was less by 20-40 dB for stimulation on the dura.• Dura stimulation only marginally affects bone vibrations as measured on the promontory, whereas stimulation on the mastoid affects intracranial sound pressure.Hearing Research (in print) 2 ABSTRACTA vibratory stimulation such as bone conduction (BC) stimulus can be applied by stimulation on the bony skull, on the skin covered skull (osseous BC), or by stimulating soft tissue, i.e.neck (non-osseous BC). The interaction between osseous and non-osseous BC pathways is assessed in this study. The relation between bone vibrations measured at the cochlear promontory and the intracranial sound pressure for stimulation directly on the dura and for stimulation at the mastoid between 0.2 -10 kHz was compared. First, for stimulation on the dura, varying the static coupling force of the BC transducer on the dura only had a small effect on promontory vibration. Second, the presence or absence of intracranial fluid did not affect promontory vibration for stimulation on the dura. Third, stimulation on the mastoid elicited both promontory vibration and intracranial sound pressure. Stimulation on the dura caused intracranial sound pressure to a similar extent above 0.5 kHz compared to stimulation on the mastoid, while promontory vibration was less by 20-40 dB. From these findings, we conclude that intracrani...

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“…A third issue is that animal models does not always predict functions in the human for BC sound as the anatomy of the cochlea and temporal bone can differ between research animals and the human. As a consequence, a large part of the literature on BC sound have used human cadaver heads [11], human temporal bones [12], measurements of accessible parts [4], or investigated sensitivity changes in pathological ears [13]. One way to circumvent this problem is to use models developed to investigate a specific phenomenon or phenomena.…”

Section: Introductionmentioning

confidence: 99%

Transmission of bone conducted sound – Correlation between hearing perception and cochlear vibration

Cited by 75 publications

References 36 publications

Model predictions for bone conduction perception in the human

Model predictions for bone conduction perception in the human

Interaction between osseous and non-osseous vibratory stimulation of the human cadaveric head

Cochlear boundary motion during bone conduction stimulation: Implications for inertial and compressional excitation of the cochlea

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