Using computer averaging techniques in 1970, Jewett recorded a sequence of low amplitude potentials occurring in the initial 10 msec. following click stimuli from scalp electrodes in human subjects. The potentials, termed auditory brainstem electrical response(BER or ABR), are thought to be the far field refraction of electrical events originating in the auditory pathway through the brainstem. BER are obtained from surface electrodes by a completely safe and nontraumatic technique, demonstrated reliability and limited variabilty of these BER provide the basis of their usefulness as an objective method for assessing hearing, especially in the pediatric population, and also used for neuro-otologic diagnosis, even in detection and localization of occult lesion in neurological diseases. We have studied BER in 6 normal hearing adults and 2 clinical cases of hearing loss. In normal subjects, all had BER thresholds less than 20 dB. S.L., with decreasing stimulus intensity, the waves of BER decreased in amplitude and increased in latency, with higher rates of stimulus repetition, the amplitude of wave I tended to decrease and later waves, however, appeared to be little affected, but wave IV and V tended to merge, in bilateral stimulus presentation, binaural summation occurred. In clinical cases, BER provided useful informations about the differentiation of hearing losses and diagnosis of brainstem lesions. So, we present their normative data and discuss its clinical applications with overview in BER.