Kalaiah, Mohan Kumar and Poovaiah, Sanjana and Shastri, Usha (2019) Threshold Estimation Using“ChainedStimuli”for Cortical Auditory EvokedPotentials in Individuals With NormalHearing and Hearing Impairment. American Journal of Audiology, 28 (2S). pp. 428-436. ISSN 10590889

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Abstract

Purpose:We investigated the utility of chained stimuli forthreshold estimation using cortical auditory evoked potentials(CAEPs) in individuals with normal hearing sensitivity andhearing loss. The effect of the order of frequency in chainedstimuli on CAEPs was also studied.Method:Seventeen individuals with normal hearing and17 individuals with mild to severe sensorineural hearing lossparticipated in the study. In individuals with normal hearing,CAEPs were recorded at 80 dB nHL for 4 chained stimuliwith different orders of frequencies within them (ChainedStimuli 1 [CS1]: 500, 1000, 2000, 4000 Hz; Chained Stimuli 2:4000, 2000, 1000, 500 Hz; Chained Stimuli 3: 500, 2000,1000, 4000 Hz; Chained Stimuli 4: 4000, 1000, 2000, 500 Hz).CAEP threshold estimation was carried out using CS1 inboth groups and was compared with behavioral pure-tonethresholds.Results:CS1 elicited the largest amplitude responses atlow and mid frequencies, whereas all 4 stimuli elicitedsimilar amplitude responses at high frequencies. CAEPthresholds were generally within 10–20 dB above theparticipants’behavioral threshold in both groups. Thedifference between CAEP threshold and behavioralthreshold was less for individuals with hearing loss comparedto individuals with normal hearing. There was a significantpositive correlation between CAEP threshold and behavioralthreshold at all the frequencies.Conclusions:CS1 could be used to elicit CAEPs for thresholdestimation in adult participants with normal hearing andhearing loss of varied degrees with theoretically reducedtesting time. The actual time reduction using chained stimuliand the correction factor to be applied to estimate behavioralthreshold can be studied in future investigation

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