Download Auditory Physiology by Aage Moller (Auth.) PDF

By Aage Moller (Auth.)

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In fact, it is of the same magnitude as that with which the sound pressure level of the stimulus tone can be deter­ mined. 35 shows results obtained in the same subject at t w o dif­ ferent times a n d at 2 m o n t h s a p a r t . In this graph, the m e a n value of the t w o determinations of the impedance change is s h o w n for intensities in 2-dB steps. Each curve represents the results of one test. 35. The response of the acoustic middle ear reflex in a subject with normal hear­ ing measured on two occasions separated by two months.

IMPEDANCE OF THE COCHLEA REFLECTED A T THE TYMPANIC MEMBRANE Studies in the cat and rabbit indicate that the cochlea contributes most of the frictional component of the impedance that can be measured at the tympanic m e m b r a n e , whereas very little of the reactive component of the impedance seems to originate from the cochlea (M0ller, 1965). These results were obtained by measuring the ear's acoustic impedance before and after the incudostapedial joint w a s interrupted, thus disconnecting the cochlea from the middle ear.

The mechanical system of the middle ear is thus much less d a m p e d , since the friction in the system is reduced when the influence of the cochlea is eliminated. 24). O v e r a large range of frequencies, the resistive component falls to nearly zero, whereas the reactive component changes relatively little as a result of disconnecting the cochlea. Results of experimentation thus show that the middle ear has very little friction and that the cochlea "seen" from the oval w i n d o w is almost a pure friction.

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