title: Protocol to collect late latency auditory evoked potentials.
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.
  
  
  OBJECTIVE
  to compare the two methods used to control the artifacts created by eye movements during LLAEP capture using two recording channels.
  
  
  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.
  
  
  CONCLUSIONS
  both methods were efficient to capture the LLAEP and to control the eye movement artifact. The rejection limit control method produced greater amplitude values.
authors.affiliation: Audiology Research Center, Craniofacial Anomaly Rehabilitation Hospital, Sao Paulo University.
authors.forename: Luzia Maria Pozzobom
authors.initials: LM
authors.lastname: Ventura
authors.forename: Kátia de Freitas
authors.initials: Kde F
authors.lastname: Alvarenga
authors.forename: Orozimbo Alves
authors.initials: OA
authors.lastname: Costa Filho
mesh_terms: D000161:Acoustic Stimulation / Q000295:instrumentation / Q000379:methods*; D000328:Adult; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D011446:Prospective Studies; D011930:Reaction Time / Q000502:physiology*; D055815:Young Adult