title: P300-long-latency auditory evoked potential in normal hearing subjects: simultaneous recording value in Fz and Cz.
abstract: The P300 is and auditory Evoked Potential, called endogenous potential because it reflects the functional use the individual makes of the auditory stimulus, being highly dependent on cognitive skills; among them we list attention and auditory discrimination. It is a procedure of objective evaluation; however, one that depends on the examiner's experience to detect wave peaks, and it is important to use recording methods that facilitate the response presence analysis and result interpretation.
  
  
  OBJECTIVE
  To analyze the P300 Long Latency Auditory Evoked Potential obtained through the use of two active electrodes positioned on Fz and Cz.
  
  
  METHODS
  330 individuals from both genders and age ranging between 7 and 34 years participated in this study, they all had normal hearing and did not have any risk factor for mental problems.
  
  
  RESULTS
  Results show that there was no statistically significant difference for N2 and P3 latency and P3 amplitude as far as gender is concerned, nor correlation with the individual's age. There was a strong correlation of these measures with Fz and Cz electrode positioning.
  
  
  CONCLUSIONS
  Fz and Cz active electrodes positioning can be considered one more resource to help in the P300 clinical analysis.
authors: Speech and Hearing Therapy - Faculdade de Odontologia de Bauru - FOB.
authors: Josilene Luciene
authors: JL
authors: Duarte
authors: Kátia de Freitas
authors: Kde F
authors: Alvarenga
authors: Marcos Roberto
authors: MR
authors: Banhara
authors: Ana Dolores Passarelli de
authors: AD
authors: Melo
authors: Roberta Moreno
authors: RM
authors: Sás
authors: Orozimbo Alves
authors: OA
authors: Costa Filho
mesh_terms: D000161:Acoustic Stimulation; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D003071:Cognition / Q000502:physiology*; D004566:Electrodes; D004594:Electrophysiology / Q000295:instrumentation / Q000379:methods*; D018913:Event-Related Potentials, P300 / Q000502:physiology*; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006309:Hearing / Q000502:physiology*; D006801:Humans; D008297:Male; D055815:Young Adult