Origin of Reversed Middle Ear Reflex in Ipsilateral Acoustic Stimulation

概要

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It is generally accepted that so called reversed reflex in ipsilateral acoustic stimulation is not rarely observed in patient with severe sensori-neural hearing loss, facial nerve paralysis and ossicular chian discontinuity. Thus, the reversed reflex seemed to be different from physiological one. In order to reveal the origin of the reversed reflex, experiments were carried out in ear model and in cat with two. impedance meters (Amplaid 702). The following results were obtained: 1) In the ear model reversed reflex was consistently obtained. 2) The reversed reflex was not artifact due to some mechanical defect of built-in filter of the impedance meter. 3) Contraction of the tensor tympani muscle had no effect upon the reversed reflex. 4) An extremely mobile eardrum was essential for elicitation of the reversed reflex. Based on the results origin of the reversed reflex was discussed.
日本耳科学会の論文