Abstract
Electrophysiology of the auditory system. Electrophysiological evaluation of the peripheral and central auditory system of brain injured patients. Experimental group: eleven brain injured and aphasic subjects, both genders and with ages ranging from 43 to 75; control group: eleven individuals without hearing complaints, equalized as to gender and age. The subjects were evaluated through auditory brainstem response (ABR); auditory middle latency response (AMLR) and auditory P300 response. An increase in the V wave latency and I-V interpeak in both groups, due to the age factor. The presence of statistically significant hemispheric differences when compared to the Pa component in MLAEP research, registered in the C3 (left hemisphere) and the C4 (right hemisphere). In researching the P300 Cognitive Potential, there was an absence or increase in P300 latency and a decrease in P300 amplitude in the presence of the N2 component. The AMLR and auditory P300 response have proven to be effective instruments for evaluating aphasic individuals.
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