Protocolo para captação dos potenciais evocados auditivos de longa latência

Abstract

Long Latency Auditory Evoked Potentials (LLAEP) represents a number of electrical changes occurring in the central nervous system, resulting from stimulation of the auditory sensorial pathways. Many studies approach the use of these potentials controlling the artifact created by eye movement with the use of equipment with a large number of channels. However, what happens is very different in Brazilian clinical practice, where the equipment used has a very limited number of channels. Aim: to compare the two methods used to control the artifacts created by eye movements during LLAEP capture using two recording channels. Materials and Methods: this is a prospective study with the application of two LLAEP capturing methods (eye artifact subtraction and rejection limit control) in 10 normal hearing individuals. Results: we did not observe statistically significant differences concerning the latency values obtained with the use of both methods, only concerning amplitude values. Conclusion: both methods were efficient to capture the LLAEP and to control the eye movement artifact. The rejection limit control method produced greater amplitude values.

Long-latency auditory evoked potentials with verbal and nonverbal stimuli

“…Despite the hemispheric differentiation and undeniable inequality in functional importance of the cerebral hemispheres, there were no differences between the performance of the right and left ears in the present study. Other studies have reported the absence of differences between ears, 10 , 11 , 12 so the discussion will focus on the comparison between speech stimuli and tone burst, regarding the latency of exogenous components, and the latency and amplitude of the endogenous component P3.…”

Potenciais relacionados a eventos em pesquisa clínica: diretrizes para eliciar, gravar, e quantificar o MMN, P300 e N400

“…Furthermore, they consist of a series of positive and negative peaks which take place from 50 ms after the stimulus onset and can be useful in investigating neural mechanisms related to auditory perception (1,2) …”

“…According to the authors, clinical participants should be selected according to clear and well established diagnostic criteria, and samples should be as homogeneous as possible (1) . The literature suggests that the controls selected in the studies should differ from the clinical group only regarding the variable of interest and the drugs used by the subjects should be documented.…”

Efeitos do ruído competitivo no desempenho auditivo de indivíduos usuários de AASI

“…A avaliação dos PEALL pode ser realizada utilizando-se estímulos verbais ou não verbais. Quando realizado com estímulos de fala, fornecem informações a respeito dos processos relacionados à codificação e decodificação da fala no sistema auditivo central, auxiliando na identificação de alterações de detecção e discriminação de fala (ALVARENGA et al, 2013;DIDONÉ et al, 2015;TREMBLAY;KORCZAK, 2008;SILVA et al, 2017). Além disso, há estudos que apontam que quanto maior é a demanda com relação ao processamento da tarefa e mais difíceis e complexos são os "alvos" a serem discriminados, maior é a latência do P300 e menor sua amplitude (DIDONÉ et al, 2015;MASSA et al, 2011).…”