Electroacoustic and electrophysiological auditory assessment in aphasic individuals

Abstract

<jats:p>ABSTRACT Purpose: to verify the functioning of the outer hair cells and the medial efferent olivocochlear system, and the integrity of the auditory pathways in the brainstem up to the auditory cortex, in aphasic individuals. Methods: the sample comprised 20 individuals - 10 without aphasia and 10 with it, aged from 21 to 58 years. The procedures used were the research of the otoacoustic emissions by a transient stimulus with and without noise, and the cognitive potential (tone-burst and speech stimuli). The findings were analyzed based on descriptive statistics. Results: the suppression effect was more present in individuals without aphasia when compared with the aphasic ones. In the cognitive potential, the mean latency values of P3 was within normality standards, with a higher latency in the individuals presented with aphasia for the tone-burst stimulus in both ears. A statistically significant difference of the P3-N2 amplitude was observed for the tone-burst stimulus, comparing the ears in both groups, and for speech stimulus only to the left ear in both groups. Conclusions: aphasic individuals did not present significant differences regarding suppression of the otoacoustic emissions. As for the cognitive potential, the aphasic individuals presented higher latency values when compared to those with no aphasia.</jats:p>

Central auditory processing and aphasia: A scoping review

“…As for LLAEP, studies have shown that aphasics have greater P300 wave latency in the left ear of individuals with left hemisphere damage caused by a stroke. This suggests that absent or abnormal P300 responses may be related to linguistic changes, corroborating the sensory and cognitive difficulties in processing message decoding 29,30 .…”

“…Concordantly, studies 22,[28][29][30] in aphasic populations demonstrated increased latency or absent waves. The increase in latencies was related to the difficulty that aphasic individuals tend to have in situations involving auditory discrimination, memory, and attention mechanisms.…”

Processamento auditivo central e afasia: uma revisão de escopo

“…No exame PEALL, as pesquisas têm demonstrado que os afásicos apresentam latência da onda P300 maior para a orelha esquerda em indivíduos com lesão no hemisfério esquerdo causada pelo acidente vascular cerebral (AVC), o que sugere que a ausência ou alteração da resposta P300 pode estar relacionada à alteração linguística, corroborando as dificuldades no processamento de decodificação de mensagens a nível sensorial e cognitivo 29,30 .…”

“…Em conformidade, estudos 22,[28][29][30] realizados com população afásica demonstraram latência aumentada ou ausência das ondas. O aumento das latências foi relacionado à dificuldade que indivíduos afásicos tendem a apresentar em situações que envolvem mecanismos de discriminação auditiva, memória e atenção.…”