[Effects of selective attention on distortion product otoacoustic emissions: depend on parameters].
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.
Wang
H T
HT
Department of Otolaryngology, Union Hospital, Tongji Medical University, Wuhan 430022.
Zhong
N C
NC
D000328:Adult; D001288:Attention; D005260:Female; D006801:Humans; D008297:Male; D017084:Otoacoustic Emissions, Spontaneous; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation