不同视觉任务及长时、重复测试对畸变产物耳声发射选择注意效应的影响

Effects of selective attention on distortion product otoacoustic emissions:Depend on parameters

目的 :观察测试参数对畸变产物耳声发射 (DPOAEs)选择注意效应的影响。方法 :自行设计两种视觉任务 ,一种为计算机屏幕上的 O和 Q字母 ,另一种为红蓝灯装置。字母 Q和蓝灯为靶刺激 ,无规则出现 ,概率为2 0 % ;字母 O和红灯为非靶刺激 ,有规则出现 ,概率为 80 %。测试 7例正常人在有、无视觉任务出现时的DPOAEs。结果 :两种视觉任务均可使 DPOAEs幅值下降 ,两种设计间的差异无显著性意义 (P >0 .0 5 )。长时重复测试使选择注意效应减弱或消失。结论 :进行 DPOAEs选择注意效应测试时 ,应选择合适的视觉任务、较短的测试时间。

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 occuring 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.