Is the scala vestibuli pressure influenced by non-piston like stapes motion components? An experimental approach
Faculty of Sciences. Physics
Singapore :World Scientific, 2006
9th International Symposium on Auditory Mechanisms, July 23-28, 2005, Portland, Oregon
University of Antwerp
The mode of vibration of the stapes is predominantly piston-like but at higher frequencies, rotations about the long and short footplate axis are also observed. An experiment was performed to verify whether the non-piston components influence the pressure produced in the cochlea. First the pressure in the scala vestibuli behind the footplate was measured using a micro-pressure sensor while a microphone recorded the pressure produced by the sound source in the car canal. Then the motion of the stapes was measured under different angles and all 3D stapes motion components were calculated. Piston motion and tilt of the footplate could thus be correlated with vestibular pressure in the same ear. With the present experimental data we can also directly calculate individual cochlear input impedances and find the width of the transmission band and the time delay in the middle ear.