Brain Stem Evoked-Responses by Tone Bursts in Humans
Effects of Rise-Time and Frequency
1977 Volume 20 Issue 2 Pages 151-157
Details
1977 Volume 20 Issue 2 Pages 151-157
BSRs were recorded in eighteen normal-hearing subjects. Auditory stimuli employed in this study consisted of tone bursts with 40msec duration; rise-time, frequency and intensity of the tone bursts were changed.
BSR latency prolonged as rise-time of the tone bursts increased, and as stimulus frequency decreased. Latencies ranged between 7.0 and 15.4msec. At the stimulus intensity of 30dBSL, in all tested subjects BSR were provoked by 500Hz and 1kHz tone bursts with 10msec rise-time; mean latencies were 15.4 and 13.4msec, respectively.
The above results suggested that hearing thresholds at 500Hz and 1kHz were predictable by the BSR. It was concluded that tone pips with 5msec rise and 5msec decay without a plateau was an appropriate stimulus for BSR audiometry.
