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为了解Logon诱发听性脑干反应的频率特异性,在文中以2～8kHz Logon及短声作为刺激声信号,来观察0.25～8kHz纯音听力正常青年人及听力曲线表现为4kHz“V”型下降,而2kHz及8kHz听阈正常青年人的听性脑干反应.结果示听力正常青年人高强度各频率Logon刺激均可引出分化很好的包括5个反应波的波形,其中I、Ⅲ波检出率最高为100%,Ⅳ、Ⅴ波常融合为一个波;听性脑干反应阈4kHz及8kHz较2kHz略低,Ⅰ波潜伏期随频率升高而缩短,Ⅲ波潜伏期缩短轻微,Ⅴ波潜伏期各频率差异无显著性意义,各波波间期随频率升高而延长.听力曲线表现为4kHz“Ⅴ”型下降,而2kHz及8kHz听阈正常的青年人,短声听性脑干反应阈、各波潜伏期、波间期均无明显异常,而4kHz Logon刺激听性脑干反应阈显著升高,2、8kHz Logon刺激听性脑干反应阈基本正常,Logon刺激听性脑干反应阈与纯音听阈线性相关.因此可以认为2～8kHz Logon刺激诱发听性脑干反应具有频率特异性,可做为相应频率听觉敏度测试的客观指标.
In order to understand the frequency specificity of Logon-induced auditory brainstem response, 2 ~ 8kHz Logon and short sound were used as stimulus signals to observe pure hearing-impaired persons with 0.25 ~ 8kHz pure hearing and 4kHz “V” , While the auditory brainstem response of normal young people at 2kHz and 8kHz hearing threshold.Results The results showed that high frequency and high frequency of Logon stimulation of normal young people can lead to well-differentiated waveforms including 5 reactive waves, of which I and III were detected IV and V waves often merge into one wave. The auditory brainstem response threshold 4 kHz and 8 kHz are slightly lower than 2 kHz. The latency of Ⅰ wave is shortened as the frequency increases, and the latency of Ⅲ wave is slightly shortened. The latency of Ⅴ wave There was no significant difference between the frequencies, and the inter-wave interval was prolonged with the increase of the frequency.The audiological curve showed a decrease of the 4 kHz “Ⅴ” type, while the threshold of the auditory brainstem response threshold at 2 kHz and 8 kHz Wave latency and wave interval. There was a significant increase of auditory brainstem response threshold at 4 kHz Logon stimulation, basal normalization of auditory brainstem response at 2 and 8 kHz Logon stimulation, auditory brainstem response threshold and pure tone threshold Therefore, it can be considered as 2 8kHz Logon evoked auditory brainstem response having a frequency specific, can be used as an objective index corresponding frequency hearing acuity test.