Studies on the Cause of the Stapedial Tinnitus

Abstract

The purpose of this paper is to search for the cause of tinnitus due to the stapedial muscle contraction. Through the observation and experiments three main facts were found as follows:
1) The stapedial muscle contraction usually does not produce tinnitus and occurence rate of the tinnitus is very low.
2) The tinnitus due to the stapedial muscle contraction which is brought about by electrical stimulation of the external auditory canal is objectively audible.
3) The contraction of the intra-tympanic muscles may not make any electrical change in the cochlea.
In view of these facts, we concluded that only in rare cases, the stapedial muscle contraction makes the oscillation around the stapedial area and this oscillation makes the noise which is received as the stapedial tinnitus.