不同选择注意任务形式对畸变产物耳声发射幅值的影响

The Effects of Different Selective Attentions on Amplitudes of Distortion Product Otoacoustic Emissions

目的探讨不同选择注意任务形式对畸变产物耳声发射（DPOAE）幅值的影响。方法对30例（60耳）耳科正常青年人分别于无任务（基线）、视觉选择注意任务（注意计数电脑显示屏上靶刺激字母Q出现的次数）以及听觉选择注意任务（注意计数插入式耳机中靶刺激2kHz短纯音出现的次数）三种状态下进行DPOAE测试,观察不同选择注意任务形式下DPOAE幅值的变化,并比较视觉、听觉选择注意任务对DPOAE的抑制效应。结果视觉任务形式和听觉任务形式的选择注意均可使受试者DPOAE的幅值降低,且两者抑制效应均主要表现在中低频（0.75~2.0kHz）幅值降低有统计学意义（P〈0.05）。在0.75、1kHz,视觉选择注意任务形式对DPOAE的抑制效应分别为8.54±4.76、7.66±5.22dB,听觉选择注意任务形式的抑制效应分别为5.27±2.32、3.22±2.15dB,前者强于后者,差异有统计学意义（P〈0.05）。结论视觉选择注意和听觉选择注意任务形式均可使DPOAE的幅值降低,且前者抑制效应显著强于后者。

Objective To investigate the effects of different selective attention on the amplitudes of distortion product otoacoustic emission（DPOAE）.Methods DPOAE measurements were performed in 30 young adults（60ears）in no task（baseline）,visual selective attention and auditory selective attention,respectively.The suppression of DPOAE amplitudes were observed in different selective attentions.The visual selective attention was to counter the number of letter Q presented on computer screen.The auditory selective attention was to counter the number of2.0kHz toneburst in the insert earphone.Results Visual and auditory selective attention both decreased the DPOAE amplitudes in mid-low frequencies（0.75~2.0kHz）.The suppression effects of visual selective attention were significant stronger than that of auditory attention in 0.75~1.0kHz.The suppression amplitudes were 8.54±4.76 and 5.27±2.32 dB at 0.75 kHz,respectively.They were 7.66± 5.22 and 3.22±2.15 dB at 1.0kHz,respectively.There were significant differences between the two selective attentions suppression（P0.05）.Conclusion Visual and auditory selective attention can both decrease the DPOAE amplitudes.The suppression effects of visual selective attention were significant stronger than that of auditory attention.