The effect of intensity on the speech evoked auditory late latency response in normal hearing individuals

Hari Prakash, Aju Abraham, Bellur Rajashekar, Krishna Yerraguntla

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)67-71
Number of pages5
JournalJournal of International Advanced Otology
Issue number1
Publication statusPublished - 01-01-2016

All Science Journal Classification (ASJC) codes

  • General Medicine


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