By Aage Moller (Auth.)
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Extra info for Auditory Physiology, 1st Edition
2 7 . Acoustic impedance at the tympanic membrane of a cat before (circles and solid lines) and after (triangles and dotted line) the middle ear cavity w a s opened and the b o n y septum removed. The upper graph s h o w s the resistive component of the impedance and the lower graph is the reactive component. ) functions as a stretched m e m b r a n e , distention will increase in stiffness. T h e effect is likely to result from the pressure difference between the t w o sides of the tympanic m e m b r a n e .
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. 34. ) STIMULUS ON LEFT EAR 100 Ι 1 gQ _ 1 1 1 1 I 3 0 0 Hz - - 70 - - 60 - / 10 - / / I I I I 90 95 1 1 I 100 105 - - - LJ I I 110 115 120 ι 1 q 1 1 1 / / - I 1 / / / j I - - jj J 20 - 1 3 0 0 Hz - - \fl 3 0 - 1 1 _ 80 0 STIMULUS ON RIGHT EAR 1—Ι 1 j j I * ' ι I I 90 95 100 ι ι ι 1 _ 5 2 5 Hz ι I 105 110 ι ι 115 120 LU S| < 5 Ö S < 100 ι 90 _ _ 80 - / 7 0 - / / 50 - / / a.
As discussed earlier, the change in admittance a n d transmission would be equal if the effect of the shunting elements in the analog circuit of the middle ear was negligible. 47, there is a certain difference between the t w o curves, which indicates that the influences of shunting elements are not large but not negligible. Difference in Effect of the Two Muscles Experiments on cats a n d rabbits h a v e shown, as expected, that the ten sor tympani muscle d r a w s the tympanic m e m b r a n e inward.