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KMID : 0858620040080010032
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Korean Journal of Audiology
2004 Volume.8 No. 1 p.32 ~ p.43
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Auditory Brainstem Responses using the "Chained-Sound Stimuli" Protocol
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Cha Oh-sang
Kim Jin-Sook
Lee Jung-Hak
Kin Hyung-Jong
Kim Yong-Bok
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Abstract
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The first purpose of this study (experiment 1) was to find out the clinical utility of the ’chained-sound stimuli’ protocol for rapid auditory brainstem responses (ABRs). This protocal contains six or three individual stimuli. Data obtained with the chained-sound protocol were compared with those obtained using a conventional protocol for recording ABRs. Another purpose (Experiment 2) was to find out the clinical utility of MB21 ABR system and to obtain normative data. For this purpose, absolute and interpeak latencies as a function of stimulus rate, stimulus sound, polarity, gender were compared. Forty normal-hearing adults, 20 females ad 20 males, with the average age of 23.83 years old, participated in this study. Only the better ear per subject was analysed for this study. The results of the Experiment 1 demonstrated that comparison of absolute and interpeak latencies using two protocols, conventional vs chained-sound, did not show significant differences. Also, the usual latency-intensity function was elicited using chained-sound stimuli. The estimated thresholds with the chained-sound protocol were very similar to those obtained with the conventional protocol. The use of a chained-sound protocal can result in time savings as compared with single click presentations. The Experiment 2 showed that mean latencies of entire waves as a function of stimulus rate (9/sec, 20/sec) and polarity (condensation, alternating, rarefaction) were not significantly different from those of conventional methods. Low frequency (500 Hz tone burst) had longer absolute latencies compared to the response for click stimulus sound. Females had significantly shorter latencies than males. These results provide that the chained-sound stimuli protocol may be a useful method to obtain rapid auditory brainstem responses. Also, MB21 ABR system would be a valuable instrument for clinical application. However, more data from hearing-impaired adults and infants should be added.
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KEYWORD
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ABRs (auditory brainstem responses), Chained-sound stimuli, MB21
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