Bone Conduction Thresholds and Skull Vibration Measured on the Teeth during Stimulation at Different Sites on the Human Head

Ito, Tsukasa; Röösli, Christof; Kim, C.J.; Sim, Jae Hoon; Huber, Alexander; Probst, Rudolf

doi:10.1159/000314282

Cited by 64 publications

(66 citation statements)

References 39 publications

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“…The intracranial sound pressure has been argued to be important for BC hearing in the human, at least when the stimulation is at the soft tissues that connect to the cranial cavity as the eye or direct application of the transducer to the dura (Ito et al, 2011;Sohmer et al, 2000).…”

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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“…In an attempt to distinguish the importance of different contributors to BC sound, Ito et al (2011) measured the hearing thresholds and teeth vibration during BC stimulation at different positions of the skull (including the eye). They concluded, from comparisons of hearing thresholds and teeth vibrations, that the BC perception is not directly related to vibration of the skull bones.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, the middle ear component of BC sound may be more important when stimulation is in line with the vibration of the ossicles (mastoid) than when it is perpendicular (forehead). Another more obvious difference due to stimulation position is when the vibration is applied at the soft tissues rather than at the skull bone (Ito et al, 2011). Such stimulation may excite the suggested pathways for BC perception significantly differently and the vibration of the bony parts surrounding the cochlea may be unrelated to the BC perception.…”

Section: Introductionmentioning

confidence: 99%

Estimation of bone conduction skull transmission by hearing thresholds and ear-canal sound pressure

Reinfeldt¹,

Stenfelt²,

Hȧkansson³

2013

Hearing Research

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Bone conduction sound transmission in the human skull and the occlusion effect were estimated from hearing thresholds and ear-canal sound pressure (ECSP) measured by a probe tube microphone when stimulation was at three positions on the skull (ipsilateral mastoid, contralateral mastoid, and forehead). The measurements were done with the ear-canal open as well as occluded by an ear-plug. Depending on the estimation method, transcranial transmission at frequencies below 1 kHz was between -8 and 5 dB, around 0 dB at 1 kHz that decreased with frequency to between -17 and -7 dB at 8 kHz. The forehead transmission was, except at frequencies between 1 and 2 kHz, similar to that proposed in the standard ISO:389-3 (1994) when the threshold measurements were conducted with open ear-canals. Compared with the same measurements using hearing thresholds, the ECSP gave similar transmission results at most frequencies, but differed at 0.5, 0.75, 2 and 3 kHz. One probable reason for the differences between thresholds and ECSP measures was a significant perception improvement (lower thresholds) when the stimulation was at the ipsilateral mastoid that was not found at the other positions. This improvement, which also was present in the occlusion effect data, was hypothesized to originate in greater sensitivity of the cochlea for vibration in line with the ipsilateral stimulation direction than from other directions.

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“…26 An accelerometer measuring SB vibrations was attached to the teeth. BC thresholds measured with stimulation at the eye and forehead were higher, although strengths in acceleration at frequencies 2-4 kHz were equal to or larger than those with stimulation at the mastoid and temporal region.…”

Section: Soft Tissue Conduction (Stc)mentioning

confidence: 99%

“…Earlier, STC was also called non-osseous BC and frequently not separated from BC. 15,26 STC involves yet another singular mechanism and pathway, and may be recognized as entirely different from AC and BC modes of auditory stimulation.…”

Section: Soft Tissue Conduction (Stc)mentioning

confidence: 99%

Hearing and stomatognathic system: Searching for a link

Baliński¹,

Morawska-Kochman²,

Bochnia³

2017

Dent. Med. Probl.

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Acoustic vibrations reach the inner ear fluids in 3 integral ways: through the air, bone, and soft tissue. The final stimulation of the hearing receptor is recognized as the result of various interactions appearing between them. Air conduction is best described as the most efficient mode of auditory stimulation. Soft tissue and bone conduction (including dentaural hearing), being frequently underestimated in the complicated process of hearing, are still less examined. Clinical observations prove that dental health may have a direct influence on hearing. Additionally, hearing improvement after dental treatment is of a permanent nature.This review presents a hypothesis and supporting literature review that dental disorders may contribute to disturbances in the excitation and/or the transmission of vibrations through the bone to the hearing receptor. Dissociation in the relationship between stimuli reaching the cochlea simultaneously in 3 modes may have a negative impact on hearing acuity.

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Bone Conduction Thresholds and Skull Vibration Measured on the Teeth during Stimulation at Different Sites on the Human Head

Cited by 64 publications

References 39 publications

Model predictions for bone conduction perception in the human

Model predictions for bone conduction perception in the human

Estimation of bone conduction skull transmission by hearing thresholds and ear-canal sound pressure

Hearing and stomatognathic system: Searching for a link

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