The Effect of Intensity on the Speech Evoked Auditory Late Latency Response in Normal Hearing Individuals

Hari, Prakash and Abraham, Aju and Rajashekar, B and Yerraguntla, Krishna (2016) The Effect of Intensity on the Speech Evoked Auditory Late Latency Response in Normal Hearing Individuals. Journal of International Advanced Otology, 12 (1). pp. 67-71.

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Abstract

OBJECTIVE: 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.MATERIALS and METHODS: 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. RESULTS: 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.CONCLUSION: 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.

Item Type: Article
Uncontrolled Keywords: Auditory late latency response; Speech-evoked ALLR; Latency-intensity function
Subjects: Allied Health > MCOAHS Manipal > Speech and Hearing
Depositing User: KMC Library
Date Deposited: 03 Nov 2016 16:15
Last Modified: 03 Nov 2016 16:15
URI: http://eprints.manipal.edu/id/eprint/147467

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