By Aage Moller (Auth.)
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Additional info for Auditory Physiology
Shown is the acoustic impedance measured at the tympanic m e m b r a n e of a cat w h e n the middle ear w a s in tact compared to when the incudostapedial joint w a s interrupted. A m o r e pronounced dip in the impedance is seen when the inner ear is discon nected, indicating that the resonance is sharper in the absence of the inner ear than when the inner and middle ears are connected. 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.
The allocation of the greater part of the frictional component of the ear's impedance to the cochlea is a prerequisite for the optimal transfer of acoustic energy to the cochlea. The conclusion that the impedance of the cochlea is likely to be nearly a pure frictional resistance, as seen from the oval w i n d o w , has also been d r a w n from theoretical analysis of the function of the cochlea b y Zwislocki (1948). Direct measurements of the impedance of the cochlea entail great technical difficulties, and the results of such studies v a r y widely.
The change in the acoustic impedance w a s measured at a frequency of 800 Hz. 2 m m H 0 .