The Auditory Brainstem Response (ABR): a normative study using the Intelligent Hearing System’s Smart Evoked Potential System

Abstract

An otoneurologic Auditory Brainstem Response (ABR) was recorded on 20 normal hearing adult subjects to determine equipment specific normative data using the Intelligent Hearing System's (IHS) Smart Evoked Potential System. Results revealed an increase in the mean latencies of wave's I, III, and V as stimulus intensity decreased. Interpeak latency was consistent across all stimulus intensities. In addition, all interaural latency differences were below 0.2 ms. Peak-to-peak amplitude measurements of waves I-I’ and V-V’ were used to calculate the wave V/I amplitude ratio. These ratio values revealed a mean ratio greater than 0.5 μV at all stimulus intensities. The stimulus rate effects showed a 0.39 ms shift in wave V when the stimulus rate was increased. These results were compared to previous data collected and Towson University and published normative data. Excellent agreement was seen across all results obtained in the current study as seen in the mean normative data and the variability represented by the standard deviation.