title: Bone-conducted hearing assessment with 80-Hz multiple auditory steady-state responses to brief tones in adults with normal hearing.
abstract: OBJECTIVE
  To investigate interactions (if any) in the bone-conduction auditory steady-state response (BC ASSR) between multiple brief tones presented simultaneously.
  
  
  METHODS
  500-, 1,000-, 2,000-, and 4,000-Hz brief tones, repeated at a rate of 77-101 Hz, were presented using a B-71 vibrator. BC ASSR thresholds and amplitudes at 50 dB nHL were measured in two conditions where the stimulus was either presented alone or together with other stimuli.
  
  
  RESULTS
  Significantly larger amplitudes in the single-stimulus condition were found at 50 dB nHL. However, there was no significant threshold difference between single- and multiple-stimulus conditions. The BC ASSR thresholds (means ± SD) at 500, 1,000, 2,000, and 4,000 Hz were 96.7 ± 9.7, 75.3 ± 11.5, 65.6 ± 7.4, and 57.8 ± 7.2 dB re 1 μN ppe, respectively.
  
  
  CONCLUSIONS
  Interactions occurred in the multiple-stimulus condition at high presentation levels, but not at threshold levels. The results of the present study imply that BC ASSR thresholds to multiple brief-tone stimuli can be assessed at the same time, at least in normal-hearing adults.
authors.affiliation: Department of Otolaryngology Head and Neck Surgery, Beijing TongRen Hospital, Capital Medical University, Beijing, PR China.
authors.forename: Lingyan
authors.initials: L
authors.lastname: Mo
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.forename: Demin
authors.initials: D
authors.lastname: Han
authors.forename: Luo
authors.initials: L
authors.lastname: Zhang
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods; D001301:Audiometry, Pure-Tone / Q000379:methods*; D001309:Auditory Threshold / Q000502:physiology*; D001844:Bone Conduction / Q000502:physiology*; D005260:Female; D006309:Hearing / Q000502:physiology*; D006801:Humans; D008297:Male; D012016:Reference Values; D055815:Young Adult