title: [Stopping criteria for averaging the multiple auditory steady-state response].
abstract: OBJECTIVE
  The aim of this study was to examine the efficiency of the averaging technique for estimating multiple auditory steady state responses in normal hearing subjects and to provide quantifiable stopping criteria at near-threshold intensities.
  
  
  METHODS
  Multiple amplitude-modulated (89-115 Hz) tones (500, 1,000, 2,000 and 4,000 Hz) were simultaneously presented to both ears at a fixed intensity of 40 dB HL. A total of 128 data epochs were averaged (23.9 minutes).
  
  
  RESULTS
  The results showed that "classic" ensemble averaging, although accurate and time-efficient in most cases, could not extract all near-threshold MSSR from noise, even after recording a considerable number of sweeps. The present study also proposed a different approach to evaluate the background noise based on evaluating the mean of the variance close to the signal.
  
  
  CONCLUSIONS
  The study proposed quantitative parameters to establish stopping criteria during auditory steady-state recordings.
authors.affiliation: Departamento de Audición y Lenguaje, Centro de Neurociencias de Cuba, La Habana, Cuba. fortuny@cneuro.edu.cu
authors.forename: Alejandro
authors.initials: A
authors.lastname: Torres Fortuny
authors.forename: María C
authors.initials: MC
authors.lastname: Pérez Abalo
authors.forename: Roberto C
authors.initials: RC
authors.lastname: Sotero Díaz
authors.forename: Lilliam
authors.initials: L
authors.lastname: Rioja Rodríguez
authors.forename: Ernesto
authors.initials: E
authors.lastname: Rodríguez Dávila
authors.forename: Lidice
authors.initials: L
authors.lastname: Galán García
authors.forename: Eduardo
authors.initials: E
authors.lastname: Eimil Suarez
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D001300:Audiometry, Evoked Response / Q000379:methods*; D001301:Audiometry, Pure-Tone / Q000379:methods; D001309:Auditory Threshold; D005072:Evoked Potentials, Auditory; D005260:Female; D006801:Humans; D008297:Male; D009622:Noise; D012016:Reference Values; D055815:Young Adult