title: Transmission of bone conducted sound - correlation between hearing perception and cochlear vibration.
abstract: The vibration velocity of the lateral semicircular canal and the cochlear promontory was measured on 16 subjects with a unilateral middle ear common cavity, using a laser Doppler vibrometer, when the stimulation was by bone conduction (BC). Four stimulation positions were used: three ipsilateral positions and one contralateral position. Masked BC pure tone thresholds were measured with the stimulation at the same four positions. Valid vibration data were obtained at frequencies between 0.3 and 5.0 kHz. Large intersubject variation of the results was found with both methods. The difference in cochlear velocity with BC stimulation at the four positions varied as a function of frequency while the tone thresholds showed a tendency of lower thresholds with stimulation at positions close to the cochlea. The correlation between the vibration velocities of the two measuring sites of the otic capsule was high. Also, relative median data showed similar trends for both vibration and threshold measurements. However, due to the high variability for both vibration and perceptual data, low correlation between the two methods was found at the individual level. The results from this study indicated that human hearing perception from BC sound can be estimated from the measure of cochlear vibrations of the otic capsule. It also showed that vibration measurements of the cochlea in cadaver heads are similar to that measured in live humans.
authors.affiliation: Department of Otorhinolaryngology Head and Neck Surgery, Sahlgrenska University Hospital, The Sahlgrenska Academy, Göteborg University, Gröna Stråket 5, S-413 45 Göteborg, Sweden. Electronic address: manseegolofsson@gmail.com.
authors.forename: Måns
authors.initials: M
authors.lastname: Eeg-Olofsson
authors.forename: Stefan
authors.initials: S
authors.lastname: Stenfelt
authors.forename: Hamidreza
authors.initials: H
authors.lastname: Taghavi
authors.forename: Sabine
authors.initials: S
authors.lastname: Reinfeldt
authors.forename: Bo
authors.initials: B
authors.lastname: Håkansson
authors.forename: Tomas
authors.initials: T
authors.lastname: Tengstrand
authors.forename: Caterina
authors.initials: C
authors.lastname: Finizia
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D000368:Aged; D001309:Auditory Threshold / Q000502:physiology; D001844:Bone Conduction / Q000502:physiology*; D002102:Cadaver; D003051:Cochlea / Q000502:physiology*; D007758:Ear, Inner / Q000503:physiopathology; D005260:Female; D006309:Hearing; D006310:Hearing Aids; D006801:Humans; D017078:Laser-Doppler Flowmetry; D008297:Male; D008875:Middle Aged; D012665:Semicircular Canals / Q000473:pathology; D012815:Signal Processing, Computer-Assisted; D012886:Skull / Q000502:physiology; D013016:Sound; D014159:Transducers; D014732:Vibration
keywords: AC; BAHA; BC; BCI; Bone anchored hearing aid; CSF; HL; LDV; LSCC; MAPP; SD; SNR; TA; air conduction; bone conduction; bone conduction implant; cerebrospinal fluid; dB; decibels; hearing level; laser Doppler vibrometer; lateral semicircular canal; mastoid surface area that attaches to the petrous part of the temporal bone; signal to noise ratio; standard deviation; transcranial attenuation