Evoked otoacoustic emission (e-OAE) elicited by click sounds was recorded by two testing apparatus (ILO88: A and laboratory-built e-OAE testing system used by probe K-2: B) and parameters in e-OAE recorded by both apparatus were compared. The subjects were 60 ears with type A tympanogram from 30 normal hearing persons. There were high negative correlations between e-OAE pseudothreshold recorded by apparatus B and total echo power (TEP) and highest peak power (HPP) in e-OAE recorded by apparatus A. However, the correlation coefficients between interaural difference of TEP and HPP in A and that of e-OAE pseudothreshold in B showed lower values because of the small interaural difference of parameters in both testing apparatus. Based upon these results, we concluded that the parameters such as TEP and HPP in apparatus A could be the useful clinical tool to investigate the function of cochlear micromechanics.
