title: [Electrophysiological study of the central and peripheral hearing system of aphasic individuals].
abstract: METHODS
  Electrophysiology of the auditory system.
  
  
  OBJECTIVE
  Electrophysiological evaluation of the peripheral and central auditory system of brain injured patients.
  
  
  METHODS
  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.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  The AMLR and auditory P300 response have proven to be effective instruments for evaluating aphasic individuals.
authors.affiliation: Faculdade de Odontologia de Bauru, Universidade de São Paulo, Bauru, SP, Brazil. dep-fono@fob.usp.br
authors.forename: Kátia de Freitas
authors.initials: Kde F
authors.lastname: Alvarenga
authors.forename: Dionisia Cusim
authors.initials: DC
authors.lastname: Lamônica
authors.forename: Orozimbo Alves
authors.initials: OA
authors.lastname: Costa Filho
authors.forename: Marcus Roberto
authors.initials: MR
authors.lastname: Banhara
authors.forename: Danielle Tavares
authors.initials: DT
authors.lastname: Oliveira
authors.forename: Michelle Alves
authors.initials: MA
authors.lastname: Campo
mesh_terms: D000328:Adult; D000368:Aged; D001037:Aphasia / Q000209:etiology* / Q000503:physiopathology; D001301:Audiometry, Pure-Tone; D002545:Brain Ischemia / Q000150:complications*; D016022:Case-Control Studies; D003072:Cognition Disorders / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D004594:Electrophysiology; D018913:Event-Related Potentials, P300; D005072:Evoked Potentials, Auditory; D005260:Female; D034381:Hearing Loss / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged