Abstract
Hyperacusis in 52 patients was investigated concerning etiology.
Time relationship between stapedial muscle paralysis and hyperacusis were examined in 9 cases of hyperacusis due to facial palsy. The relationship proved to be unstable in most cases.
Similar results were obtained in the study of another 50 patients with this palsy.
In 18 cases of unilateral hyperacusis without hearing impairment due to various etiology, except facial palsy, stapedial reflexes were analyzed bilaterally. Stapedial reflexes in normal ears occurring by sound stimulation to the ears with hyperacusis proved to have a larger amplitude than reflexes in the opposite ears in 9 cases (50%). We regard this result as one of the clues to the enbodiment of hyperacusis.
