Abstract: ［ABSTRACT］Objective： To observe normative auditory brainstem response (ABR) latencyintensity functions and the threshold and provide reference for combined clinical use of air and boneconducted ABR. Methods: ABR absolute thresholds and latencies(Ⅴwaves)were obtained from 56 ears of 28 young persons with normal hearing using both the EARTONE insert earphone and the Radioear B71 bone viboratory. Results: The air and boneconducted waveⅤlatencyintensity functions exhibited increased latencies as intensity decreased. The boneconducted clicks yielded somewhat longer latencies than the airconducted ones. Conclusions: (1) The waves of air and boneconducted ABR are similar, and more information on ascertaining the presence and magnitude of a conductive hearing loss can be obtained when both air and boneconducted ABR wave V latencyintensity functions are administered. (2) When the threshold of boneconducted hearing exceeds approximately to 40 dBHL, no BCABR responses can be observed. (3) Masking is often necessary when administering boneconducted ABR test, but intensity of masking should not exceed to over 60 dBSPL.

Key words: Perceptual masking, Bone viborator , Auditory brain stem evoked response