Comparação dos Potenciais de Latência Média com ou sem estímulo musical

Abstract

Audi tory evoked potentials can be used as a tool to investigate the central nervous system and structures that can be activated by auditory stimulation. There are few studies correlating the Middle Latency Response with different types of auditory stimulation, which led us to undergo this study. Aim: to verify The Middle Latency Response (MLR) in normal hearing adults when stimulated by clicks and music in the contralateral ear. Study design: a cross-sectional contemporary cohort. Method: MLR was carried out on 10 normal hearing subjects using bilateral clicks (70 dB nNA) and music in the contralateral ear. We measured and compared the amplitude and latency of the Pa wave with clicks and clicks and music. We compared the amplitude and latency of the electrodes in sites C3 and C4 for both ears with and without music. Results: All subjects had MLR within normal limits for both amplitudes and latencies bilaterally. Stimuli with music and clicks revealed a reduction of the amplitude in the contralateral ear with the music stimulus in all electrode sites although this reduction was not statiscally significant. Conclusion:We conclude that music in the contralateral ear reduces the amplitude of the Pa wave of the MLR.

Estudo do efeito de supressão no potencial evocado auditivo de tronco encefálico

“…Investigating the Middle Latency Auditory Evoked Potential with click stimulus and contralateral music in normal hearing adults (20), a decrease in wave amplitudes of the ear contralateral to the music stimulus in all electrode positions and for all subjects was reported -although this difference was not statistically significant. Although having stated that further studies are needed, the authors agreed to the hypothesis stated by the previously mentioned study (14) that this effect could be influenced by the efferent system.…”

Cortical inhibition effect in musicians and non-musicians using P300 with and without contralateral stimulation

“…This finding is also in agreement with the literature, as higher amplitude values in musicians reflect more neural connections in the auditory pathway and suggest that musical training has an effect. 3 , 4 , 5 …”

“…Thus, musical training has been a frequent and effective resource in the rehabilitation of communication disorders. 3 , 4 , 5 …”

Processamento auditivo: comparação entre potenciais evocados auditivos de média latência e testes de padrões temporais

“…O PEAML tem múltiplos geradores, refletindo áreas primárias e não-primárias, como, por exemplo, a formação reticular e as divisões multisensoriais do tálamo; com uma maior contribuição das vias tálamo-corticais 5 e com menor do colículo inferior (mesencéfalo), da formação reticular e do córtex auditivo 6 . A presença das respostas auditivas evocadas de latência média permite a avaliação da integridade do sistema auditivo periférico e central, bem como dos núcleos e vias auditivas existentes até no nível da região tálamo-cortical e córtex auditivo primária.…”