title: Long-latency auditory evoked potentials with verbal and nonverbal stimuli.
abstract: BACKGROUND
  Long-latency auditory evoked potentials represent the cortical activity related to attention, memory, and auditory discrimination skills. Acoustic signal processing occurs differently between verbal and nonverbal stimuli, influencing the latency and amplitude patterns.
  
  
  OBJECTIVE
  To describe the latencies of the cortical potentials P1, N1, P2, N2, and P3, as well as P3 amplitude, with different speech stimuli and tone bursts, and to classify them in the presence and absence of these data.
  
  
  METHODS
  A total of 30 subjects with normal hearing were assessed, aged 18-32 years old, matched by gender. Nonverbal stimuli were used (tone burst; 1000Hz - frequent and 4000Hz - rare); and verbal (/ba/ - frequent; /ga/, /da/, and /di/ - rare).
  
  
  RESULTS
  Considering the component N2 for tone burst, the lowest latency found was 217.45ms for the BA/DI stimulus; the highest latency found was 256.5ms. For the P3 component, the shortest latency with tone burst stimuli was 298.7 with BA/GA stimuli, the highest, was 340ms. For the P3 amplitude, there was no statistically significant difference among the different stimuli. For latencies of components P1, N1, P2, N2, P3, there were no statistical differences among them, regardless of the stimuli used.
  
  
  CONCLUSIONS
  There was a difference in the latency of potentials N2 and P3 among the stimuli employed but no difference was observed for the P3 amplitude.
authors.affiliation: Human Communication Disorders, Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil. Electronic address: she_oppitz@hotmail.com.
authors.forename: Sheila Jacques
authors.initials: SJ
authors.lastname: Oppitz
authors.affiliation: Human Communication Disorders, Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil.
authors.forename: Dayane Domeneghini
authors.initials: DD
authors.lastname: Didoné
authors.affiliation: Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil.
authors.forename: Débora Durigon da
authors.initials: DD
authors.lastname: Silva
authors.affiliation: Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil; Fundo de Incentivo à Pesquisa (FIPE), Santa Maria, RS, Brazil.
authors.forename: Marjana
authors.initials: M
authors.lastname: Gois
authors.affiliation: Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil.
authors.forename: Jordana
authors.initials: J
authors.lastname: Folgearini
authors.affiliation: Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil.
authors.forename: Geise Corrêa
authors.initials: GC
authors.lastname: Ferreira
authors.affiliation: Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil; Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
authors.forename: Michele Vargas
authors.initials: MV
authors.lastname: Garcia
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods*; D000293:Adolescent; D000328:Adult; D001307:Auditory Perception / Q000502:physiology*; D004594:Electrophysiology; D018913:Event-Related Potentials, P300 / Q000502:physiology*; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D011930:Reaction Time / Q000502:physiology; D055815:Young Adult
keywords: Audiologia; Audiology; Electrophysiology; Eletrofisiologia; Event-related potentials, P300; Evoked potentials, auditory; Potenciais evocados auditivos; Potencial evocado P300