Abstract
The acoustical input impedance of the guinea-pig middle ear was measured in the frequency range 100–10 000 Hz, using a highimpedance volume-velocity source and a probe-tube microphone. The impedance was measured both in the normal ear and with the tympanic membrane removed; the latter measurement permits accurate characterization of the middle-ear cavities themselves. The data was compared to a slightly modified version of the middle-ear model of Zwislocki [J. Acoust. Soc. Amer. 35, 1034–1040 (1963)], and new parameter values were calculated to match the present data. We also measured the time couraes of transient impedance changes caused by spontaneous contractions of the middle-ear-muscles of the anesthetized animals. These transient changes were compared to the middle-ear-muscle effects predicted by the model. [Supported by the Medical Research Council of Canada.]
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