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[Effects of selective attention on distortion product otoacoustic emissions: depend on parameters]
1Department of Otolaryngology, Union Hospital, Tongji Medical University, Wuhan 430022.
Objective:
In order to investigate the effects of parameters of selective attention on DPOAEs.
Method:
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).
Result:
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.
Conclusion:
It was suggested that parameters influence the suppressive effects. The test should not last over 1 minute and once or twice may be optical.