The results of the present investigations show:1) The threshold for the acoustically elicited impedance changes is lower for white noise and low frequency stimuli than for high frequency stimuli.2) The size of the acoustically elicited impedance changes is larger for low frequency stimuli than for high frequency stimuli of the same intensity above the impedance threshold.3) The increase of impedance change as a function of increased stimulus intensity is faster for low frequency stimuli than for high frequency stimuli.4) The duration of the acoustically elicited impedance changes is longer for continuous low frequency stimulation of the same intensity above the impedance threshold.5) As far as the impedance change of the middle ear is considered a protective mechanism for noise induced hearing loss, our results indicate that the inner ear in this respect is better protected when exposed to low frequency sound than to high frequency sound.
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Djupesland et al. (1967) studied this question.
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