In 1970, Jewett and Williston clearly recorded far field auditory evoked potentials from human brain stem by using scalp electrodes. By convention, the positive waves at vertex were labeled from on through seven in Roman numerals. They would be no risky, none surgical, and reproducible. They were not required patient cooperation and the response threshold can be obtained at least 15 dB HL. Each subject was tested in a supine position and the data was recorded with silver disk electrodes from the forehead referenced to the test ear lobe. Auditory stimuli were 2K logon produced by signal generator delivered through head phone and bone vibrator. The amplified data was averaged and displayed by computor and graphically recorded on an XY plotter. There was a total of 119 normal subjects (age, 5 to 60 years). All subjects had no history of hearing difficulty, and all had normal hearing (ISO caiteria). Peak latencies of each wave were measured from 90 dB HL to the threshold of the wave V. In male subjects, latency from wave I to V was 3.92±0.21 (2 SD) msec, latency from wave III to V was 1.88±0.17, latency of wave V was 5.42±0.26 msec in 70 dB HL. In female subjects, wave I to V was 3.81±0.25 msec, wave III to V was 1.80±0.25 msec and wave V was 5.26±0.29 msec in 70 dB HL. Detection threshold of the wave V was 13.9±5.7 dB HL. Maximal interaural latency difference in 70 dB HL was 0.2 msec and the mean latency shift of wave V was approximately 0.1 msec when the response at 20/sec and 5/sec were compared. Latency shift between the air and bone conduction in 70 dB HL was 0.9 msec.