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Transmission of bone-conducted sound in the human skull measured by cochlear vibrations.

Journal article
Authors Måns Eeg-Olofsson
Stefan Stenfelt
Anders Tjellström
Gösta Granström
Published in International journal of audiology
Volume 47
Issue 12
Pages 761-9
ISSN 1708-8186
Publication year 2008
Published at Institute of Clinical Sciences, Department of Otorhinolaryngology
Pages 761-9
Language en
Keywords Acoustic Impedance Tests, Aged, Aged, 80 and over, Bone Conduction, Cadaver, Cochlea, physiology, Cranial Sutures, physiology, Female, Humans, Male, Middle Aged, Regression Analysis, Skull, physiology, Vibration
Subject categories Otorhinolaryngology


One limitation with the Bone Anchored Hearing Aid (Baha) is too poor amplification for patients with moderate to severe sensorineural hearing losses. Therefore, we investigated if bone conducted (BC) sound transmission improves when the stimulation approaches the cochlea. Also the influence from the squamosal suture on BC sound transmission was investigated. Both sides of the heads on seven human cadavers were used and vibrational stimulation was applied at eight positions on each side with a frequency range of 0.1-10 kHz. A laser Doppler vibrometer was used to measure the resulting velocity of the cochlear promontory. It was found that the velocity of the promontory increases as the stimulation position approaches the cochlea; this was especially apparent at distances within 2.5 cm from the ear canal opening and when the stimulation position was in the opened mastoid. At frequencies above 500 Hz there was on average 10 to 20 dB greater vibrational response at the cochlea when the stimulation was close to the cochlea compared with the normal Baha position. Moreover, even if there were general indications of attenuation of BC sound when passing the squamosal suture, an effect from the suture could not be conclusively determined.

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