title: Study of suppression effect in the brainstem auditory evoked potential.
abstract: BACKGROUND
  the suppression effect with contralateral white noise observed in the brainstem auditory evoked potential can be influenced by the efferent auditory system.
  
  
  OBJECTIVE
  to evaluate the suppression effect with contralateral white noise in the Brainstem Auditory Evoked Potential of individuals with normal hearing.
  
  
  METHODS
  25 individuals, ranging in age from 18 to 30 years, of both genders, were submitted to a clinical history questionnaire, inspection of the external auditory canal, conventional audiometry, speech audiometry and acoustic immittance measurements. Only individuals with normal hearing thresholds were selected. The selected individuals underwent brainstem auditory evoked potential testing with and without contralateral white noise.
  
  
  RESULTS
  a significant statistical difference was observed between the situations with and without contralateral white noise, for wave I amplitude and waves III and V latencies. No statistical differences were observed for the interpeak latencies.
  
  
  CONCLUSIONS
  the present study indicated increased latencies and reduced amplitudes of waves I, III and V with contralateral noise, when comparing the situations with and without noise. These results suggest a possible influence of the efferent auditory system on the response modulation of Brainstem auditory evoked potential when contralateral white noise is used.
authors.affiliation: Fonoaudióloga, Universidade Federal de São Paulo, Brazil. cgmatas@usp.br
authors.forename: Carla Gentile
authors.initials: CG
authors.lastname: Matas
authors.forename: Fernanda Nivoloni O
authors.initials: FN
authors.lastname: Silva
authors.forename: Renata Aparecida
authors.initials: RA
authors.lastname: Leite
authors.forename: Alessandra Giannella
authors.initials: AG
authors.lastname: Samelli
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods*; D000293:Adolescent; D000328:Adult; D001306:Auditory Pathways / Q000502:physiology*; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009622:Noise; D055815:Young Adult