engleski

Morphological Changes Of ERPs To The Perception of Vowels And CV Syllables In The Post-Implantation Period In One Cochlear Implant User

Restoration of hearing after cochlear implantation is based principally on two factors: i) degree of bypassing damaged structures in the inner ear by the surgical insertion of a neuroprosthetic device and ii) intrinsic properties of the neural auditory system for processing novel auditory sensory input (plasticity). The exploration of the mechanisms underlying auditory perception in altered auditory systems can contribute to the understanding of both fundamental principles of human auditory perception and human brain dynamics. This study explores morphological changes of the event related brain potentials associated with the auditory perception of vowels and consonant-vowel (CV) syllables following a cochlear implantation (CI) in a profoundly deaf adult. The participant was tested in the phonological discrimination of /a/ vs /e/, /u/ vs /i/, /fa/ vs /sa/ and /pa/ vs /ta/ contrasts in a pseudo-odd ball task once a month for a period of 5 months. During this period, the participant underwent a speech rehabilitation program based on the verbotonal method and his CI sound processor was adjusted according to clinical rules in several fitting sessions. In order to avoid data artifacts caused by the cochlear implant which was located on the right side of the head, we restricted ERP recordings to the left side of the head. Data analysis focuses on the morphological changes of the ERP waves across different stimulation patterns caused by vowels and CV syllables at 5 time points. In addition, data on the relationship between implant stimulation patterns and ERP waveform output will be presented. Supported by the Central European Initiative Science and Technology Fellowship to DK.

cochlear implant; event related potentials

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