Cortical Auditory Evoked Potentials as Indicators of Hearing Aids Performance in Speech Perception

Mohammed G. Al-zidi, Jayasree Santhosh, Siew‐Cheok Ng, Abdul Rauf A Bakar, Ibrahim Amer Ibrahim

Abstract


Cortical auditory evoked potentials represent summation of neural activity in the auditory pathways in response to sounds. They provide an objective measure of the brain’s response to sound. For this reason, they are an effective tool for scientists and audiologists for investigating
auditory function in normal people and those with hearing loss. The main objective of this study is to determine what components among the P1, N1, P2, N2, or P3 are most beneficial in assessing the speech detection and discrimination abilities of adult sensorineural hearing loss population.
This study also intends to investigate whether changes in the amplitudes and latencies of these components occurring with sensorineural hearing loss and hearing aids differ in responses reflecting different stages of auditory processing. Auditory Potentials were recorded to /ba/ and
/da/ stimuli from two Malay adult groups. A control group of 12 right-handed having normal hearing and a group of 10 right-handed with sensorineural hearing loss. The results showed that P2 and P3 components had the most benefits from the use of hearing aids in the hearing loss subjects and therefore could be used in both clinical and research applications as a predictor and objective indicator of hearing aids performance in speech perception. The study also showed that the brain processes both stimuli in a different pattern for both the normal and the aided hearing loss subjects. The present study could provide more diagnostic information for clinicians and could also offer
better speech perception benefits for hearing-impaired individuals from their personal hearing aids. The findings also suggest that the aided hearing loss subjects, despite the benefits they get from the hearing aids, find it difficult to detect and discriminate the acoustic differences between the two speech stimuli.


Keywords


Cortical auditory evoked potentials; consonant vowels; hearing loss; sensorineural hearing loss; speech stimuli.

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References


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