[Investigation on the frequency specificity of the auditory brainstem response to tone burst in three different conditions].
OBJECTIVE
This study investigated and compared the effects of tone burst in three different conditions (linear-gated tone burst, linear-gated tone burst in broadband noise masking and Blackman-gated tone burst) on the frequency specificity of ABR.


METHODS
The latencies of ABR wave V were recorded respectively on sixteen normal-hearing adults using 1, 2 and 4 kHz tone bursts in three types of stimuli at different intensities.


CONCLUSIONS
1. Three types of tone bursts may evoke similar frequency-specific ABR when stimulus intensity was lower than 70 dB nHL for 1 kHz and any intensity for 2, 4 kHz. At the high-intensity(> or = 70 dB nHL) for lower frequency (1 kHz), however, linear-gated tone burst had poor frequency specificity due to the increased effects of spectral splatter. To improve the frequency specificity, linear-gated tone burst should be mixed with masking noise or using Blackman-gated tone burst directly. 2. Both linear-gated tone burst in broadband noise masking and Blackman-gated tone burst of 1 kHz, 2 kHz and 4 kHz at any intensity can produce frequency-specific ABR, but response amplitudes were smaller for the broadband noise masking condition than for the Blackman-gated one. Therefore the Blackman-gated tone burst is prefered.
Wang
Shili
S
Department of Otolaryngology, Ruijin Hospital, Shanghai Second Medical University, Shanghai 200025.
Chen
Xueming
X
Ye
Yan fen
Yf
Pan
Si fen
Sf
D000161:Acoustic Stimulation / Q000379:methods; D000328:Adult; D001301:Audiometry, Pure-Tone / Q000379:methods*; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male