There was a difference in the latency of potentials N2 and P3 among the stimuli employed but no difference was observed for the P3 amplitude.
Introdução: Diferentes tipos de alteração no sistema nervoso central (SNC) podem resultar em diversos tipos de distúrbios de linguagem e/ou fala. Havendo alguma alteração em nível central, é possível que algumas habilidades auditivas estejam alteradas. Objetivo: Avaliar as habilidades do processamento auditivo de modo comportamental e eletrofisiológico em sujeitos com afasia de expressão e identificar a correlação entre as avaliações. Métodos: Participaram do estudo sujeitos com idade entre 29 e 72 anos, com afasia de expressão decorrente de lesão encefálica (acidente vascular cerebral ou traumatismo crânio encefálico). Esses indivíduos foram submetidos a uma avaliação audiológica básica, além da avaliação comportamental e eletrofisiológica do processamento auditivo, que contemplou os seguintes testes: localização sonora, memória sequencial para sons verbais e não verbais, padrão de frequência e duração, dicótico de dígitos, fala comprimida, identificação de sentenças sintéticas e dicótico não verbal, além do Potencial Evocado Auditivo de Longa Latência (PEALL) P300. Resultados: Todos os sujeitos avaliados apresentaram alteração na maioria das habilidades comportamentais de processamento auditivo. No PEALL, todos apresentaram os potenciais exógenos (N1, P2) dentro da latência esperada. Apenas um não apresentou o potencial P300 bilateralmente. Os outros cinco afásicos apresentaram P300 bilateralmente. Conclusão: Foi possível avaliar as habilidades do processamento auditivo em quase todos os sujeitos com afasia de expressão de modo comportamental e eletrofisiológico. Não foi observada correlação significativa entre as avaliações, identificando que as avaliações comportamentais foram piores do que as eletrofisiológicas.
Introduction Long Latency Auditory Evoked Potentials (LLAEP) with speech sounds has been the subject of research, as these stimuli would be ideal to check individualś detection and discrimination. Objective The objective of this study is to compare and describe the values of latency and amplitude of cortical potentials for speech stimuli in adults with normal hearing. Methods The sample population included 30 normal hearing individuals aged between 18 and 32 years old with ontological disease and auditory processing. All participants underwent LLAEP search using pairs of speech stimuli (/ba/ x /ga/, /ba/ x /da/, and /ba/ x /di/. The authors studied the LLAEP using binaural stimuli at an intensity of 75dBNPS. In total, they used 300 stimuli were used (∼60 rare and 240 frequent) to obtain the LLAEP. Individuals received guidance to count the rare stimuli. The authors analyzed latencies of potential P1, N1, P2, N2, and P300, as well as the ampleness of P300. Results The mean age of the group was approximately 23 years. The averages of cortical potentials vary according to different speech stimuli. The N2 latency was greater for /ba/ x /di/ and P300 latency was greater for /ba/ x /ga/. Considering the overall average amplitude, it ranged from 5.35 and 7.35uV for different speech stimuli. Conclusion It was possible to obtain the values of latency and amplitude for different speech stimuli. Furthermore, the N2 component showed higher latency with the / ba / x / di / stimulus and P300 for /ba/ x / ga /.
Purpose: Evaluating the level of difficulty of identifying verbal and non-verbal stimuli, according to the classification of the participants, as well as comparing the latency of the P3 cortical potential. Methods:Thirty subjects, with a mean age of 23 years and normal hearing, were evaluated. The P3 potential was performed with non-verbal stimuli (tone burst) and verbal (/ba/ x /di/, /ba/ x /ga/, /ba/ x /da/). Each subject had to classify stimulus in "the easiest" and "the most difficult". Results:Most subjects rated the /ba/ x /di/ contrast as the easiest to identify and the contrast /ba/ x /ga/ the most difficult. The subjects reported that the speech stimulus were easier to identify when compared to tone burst.
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