Prakash Hari, Abraham Aju, Rajashekar Bellur, Yerraguntla Krishna
Department of Speech and Hearing, School of Allied Health Science, Karnataka, India.
J Int Adv Otol. 2016 Apr;12(1):67-71. doi: 10.5152/iao.2016.1776.
Among the stimulus factors, the influence of presentation level is less studied in normal-hearing individuals when using speech stimuli withvarious presentation levels for the auditory late latency response (ALLR). Hence, the present study aimed to explore the Latency-Intensity (L-I) function, i.e., how the latency and amplitude change as a function of intensity using speech stimuli.
Speech-evoked ALLR was obtained from 15 normal-hearing individuals. The syllable/ta/ was used to record ALLR with an intensity of 30, 50, 70, and 90 dBSPL. Electroencephalography (EEG) from five channels was recorded and analyzed offline.
The overall results revealed that there is an influence of intensity on P1 and N1 latencies in a nonlinear fashion. The latency change is consistent at lower intensities than at moderate and high intensities. The amplitude changes did not reach significance, though a decrease with a reduction in intensity was obvious.
There is a significant effect of intensity on the latency and amplitude of ALLR in speech stimulus. However, this effect may vary for different speech stimuli.
在刺激因素中，当使用具有不同呈现水平的言语刺激来诱发听觉晚潜伏期反应（ALLR）时，正常听力个体中呈现水平的影响研究较少。因此，本研究旨在探讨潜伏期-强度（L-I）函数，即使用言语刺激时潜伏期和波幅如何随强度变化。
从15名正常听力个体中获取言语诱发的ALLR。使用音节/ta/以30、50、70和90 dBSPL的强度记录ALLR。记录五个通道的脑电图（EEG）并进行离线分析。
总体结果显示，强度对P1和N1潜伏期有非线性影响。在较低强度下潜伏期变化比在中等强度和高强度下更一致。波幅变化虽未达到显著水平，但强度降低时波幅明显减小。
强度对言语刺激中ALLR的潜伏期和波幅有显著影响。然而，这种影响可能因不同的言语刺激而有所不同。
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