title: [Effects of selective attention on distortion product otoacoustic emissions: depend on parameters].
abstract: OBJECTIVE
  In order to investigate the effects of parameters of selective attention on DPOAEs.
  
  
  METHODS
  We designed two kinds of visual tasks. One was two letters O and Q displaying on computer screen. The other was a red-blue light device. Letter Q and blue light were target stimuli flashing at random (probability was 20%), letter O and red light were non-target stimuli occurring orderly (the probability was 80%). DPOAEs with and without visual tasks were tested in 7 normal subjects (14 ears).
  
  
  RESULTS
  Both of two kinds of visual tasks suppressed DPOAEs and there was no significant difference between them (P > 0.05). Long time test and retests reduced the suppression or even made it disappear.
  
  
  CONCLUSIONS
  It was suggested that parameters influence the suppressive effects. The test should not last over 1 minute and once or twice may be optical.
authors.affiliation: Department of Otolaryngology, Union Hospital, Tongji Medical University, Wuhan 430022.
authors.forename: H T
authors.initials: HT
authors.lastname: Wang
authors.forename: N C
authors.initials: NC
authors.lastname: Zhong
mesh_terms: D000328:Adult; D001288:Attention; D005260:Female; D006801:Humans; D008297:Male; D017084:Otoacoustic Emissions, Spontaneous; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation