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| Author(s): |
Raquel Caroline Ferreira Lopes
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Bauru. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Odontologia de Bauru (FOB/SDB) |
| Defense date: | 2013-02-28 |
| Examining board members: |
Katia de Freitas Alvarenga;
Adriane Lima Mortari Moret;
Eliane Maria Carrit Delgado Pinheiro
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| Advisor: | Katia de Freitas Alvarenga |
| Abstract | |
The physiological changes in the auditory system based on age reflect in the auditory evoked potentials, thus, it is possible to determine that a relationship exists between these changes and the development of auditory skills. The perception of sound can change the electroencephalogram of the human listener, and these modifications can be extracted from this record, identifying the auditory-evoked potentials used to describe the response of the front auditory system to stimulations. The cochlear implant has been a successful option for hearing correction in children with moderate or serious hearing loss; the long-term use of the device can change the responses of the central nervous auditory system for the electric stimulation through the cochlear implant once the literature shows that the experience with the cochlear implant provides good speech perception results. The objective of this study was to identify and verify the characteristics of the P1 component of the cortical auditory evoked potentials in hearing-impaired individuals with long-term use of the cochlear implant and correlate them with speech development, and secondarily, other variables related to the cochlear implant. Thirty (30) cochlear implant users, both male and female, implanted between the ages of two and four years old and use of the electronic device for the time period between six and 14 years, participated in this study. The P1 component of the cortical auditory evoked potentials was studied with speech stimulation and speech perception evaluated with a list of sentences. The procedures were evaluated in an open environment. As a result, it was found that the P1 component was recorded in each of the evaluated, with average latent values of 31,87±34,46 ms and amplitude of 2,42±1,46 μV. The occurrence of latency reduction (p=0,539) and the increase in amplitude (p=0,297) of the P1 component were noted, with the absence of correlation between the groups with less and more than 10 years of use of the electronic device. When analyzing the effort in speech perception and the characteristics of the P1 component by the behavioral points, the score of >54% was considered \"good\", and <=54% was \"poor\", and the later analysis of the latent values of the P1 component (p=0,753) and the amplitude (p=0,399) in both groups, a statistically significant difference was not found. Thus, the presence of the P1 component in individual cochlear implant users shows that the cochlear implant restores the capacity to hear. The standard maturity potential of the cortical closely follows that of a hearing child, but with a delay in latency and decrease in amplitude. After a long period of cochlear implant use, the P1 component is not a lone predictor of speech perception performance. (AU) | |
| FAPESP's process: | 11/04698-7 - Characterization of Cortical Auditory Evoked Potentials in individuals with long-term use of cochlear implants |
| Grantee: | Raquel Caroline Ferreira Lopes Fontanelli |
| Support Opportunities: | Scholarships in Brazil - Master |