Banca de QUALIFICAÇÃO: THAIS NOBRE UCHÔA SOUZA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : THAIS NOBRE UCHÔA SOUZA
DATE: 09/09/2022
TIME: 09:00
LOCAL: Online - Google meet
TITLE:

New verbal discrimination test with the use of mismatch negativity in children with phonological disorder

KEY WORDS:

Mismatch Negativity. Auditory Evoked Potential. Hearing. Speech Perception. Phonological Disorder.

PAGES: 97
BIG AREA: Multidisciplinar
AREA: Biotecnologia
SUBÁREA: Biotecnologia em Saúde
SUMMARY:

Auditory discrimination represents a fundamental aspect for the correct production of speech sounds, as it is through the perception of acoustic characteristics that phonemes can be distinguished from one another, generating appropriate neural representations. Children with phonological disorder present disorganization of the sound system, with the presence of substitution and/or omission of phonemes, in an age group that is no longer expected. The etiology of this disorder is still not clear, however, the inability to audibly discriminate the characteristics of phonemes may be a causal or aggravating factor of this condition. Given the relationship between auditory skills and phonological disorder, the investigation of auditory processing in these children becomes extremely valuable. Thus, the objective assessment of auditory processing, through electrophysiological tests of hearing, such as the Mismatch Negativity, plays a relevant role in studies of this population. In the search for a greater understanding of this theme, a systematic review with meta-analysis was carried out, in order to know the researches that used the Mismatch Negativity to assess auditory discrimination in children with the disorder, and to have an overview of the protocols used in these studies. Few studies were found in the literature that used this potential in the studied population and no studies were found that related the verbal stimulus used for auditory discrimination with the phonological processes that children with phonological disorders present in their speech. In addition, still focusing on the auditory discrimination of children with phonological disorders, the development of a device that could contribute to the therapy of these children was proposed, providing a better perception and discrimination of phonemes, necessary for the adequate production of speech, enabling thus, a more efficient auditory feedback, and that would also offer the teaching practice the possibility of a more refined shared learning of the acoustic characteristics of speech. Knowing that the investigation of the relationship between the skills of speech production and perception is essential for these children, since new discoveries can reorganize the intervention model for this population, it was proposed to develop a new verbal discrimination test with use of the Mismatch Negativity for children with phonological disorder, using verbal stimuli that correspond to phonological processes. The research aimed to compare the auditory discrimination ability of children with phonological and neurotypic disorders, aged between four and seven years, of both sexes, using the Mismatch Negativity, using the natural speech stimuli /ta/, /ga/ and /da/, developed for the present study. The stimuli were chosen to be matched in pairs so as to correspond to phonological processes, with the stimulus /ta/x/da/ being associated with the deafening process or the sound of plosives and the stimulus /ga/x/da/ related to frontalization or posteriorization to velar, in which the syllable /da/ was always presented as the rare stimulus, with 20% of appearance. The results were analyzed statistically. The sample studied showed a high prevalence of phonological disorder in boys, aged 5 years, with mild-moderate severity and with a higher occurrence of processes of consonant cluster simplification, liquid simplification and final consonant simplification. In the intragroup comparison, it was possible to verify that children with phonological disorder discriminate in a similar way the pairs of stimuli used. There was no correlation between MMN and speech intelligibility.

BANKING MEMBERS:
Presidente - 021.848.674-03 - PEDRO DE LEMOS MENEZES - UNCISAL
Interna - 259.657.108-01 - LUCIANA APARECIDA CORA - UNCISAL
Externa à Instituição - LUCIANA MACEDO DE RESENDE
Externa à Instituição - MARCIA KESKE-SOARES