Background and Objectives: As part of the inner ear, the normal human cochlea produces low-intensity sounds when it is stimulated by soft clicking sounds called Otoacoustic emissions (OAEs). However, these sounds are produced specifically by the cochlear outer hair cells as they vibrate, expand and contract, therefore producing inaudible sounds that echoes back into the middle ear. Aim: This study aims to examine the effect of high acoustic reflex sounds on the signal to noise ratio using transient otoacoustic emission in adults with normal hearing. The study also aims to reveal other medical status that may explain patients’ complaints of symptoms such as vertigo and tinnitus. Method: A total of 40 of participants of both sexes aged between 18 and 22 years (mean: 22 years) were tested heir right ear side using a transient otoacoustic recording followed by acoustic reflex 750-2000Hz at the audiology and speech department at the audiology center at Zarqa university.

Results: Significant difference in the mean of signal to noise ration and the amplitudes were noticed after acoustic reflex testing. The maximum transient reduction of approximately 10 dB in the frequency range 750-2000 Hz after exposure to continuous steady high sound. The transient otoacoustic emission strength went back to base line before exposure after 30 minutes.

Conclusion: It can be concluded that using high continuous intensity sound has a significant correlation when reducing the transient evoked otoacoustic mission amplitude. We also emissions could not be detected in the ears of patients with cochlear hearing impairment (Kemp, et al, 1986; Wada et al. 1993; Zaho et al. 2000). This implies that the origin ofthe emissions is located in the cochlea.

Index Terms- transient evoked otoacoustic emission amplitude, Ipsilateral acoustic reflex, signal to noise ratio, otologically normal adults.