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目的观察不同前庭刺激对人体听觉认知活动和脑事件相关电位(ERPs)的影响。方法33名大学生,在前庭刺激为10°/s匀速旋转150s后,分别进行0.6°/s2、0.8°/s2、1.0°/s2和1.2°/s2四种不同角加速度梯形旋转刺激,并完成听觉认知任务:对等概率出现的中文阿拉伯数字信号2～9中的奇数(靶信号,T)进行按键反应,对偶数(非靶信号,NT)不反应。记录受试者脑电图并分析ERPs。结果不同前庭刺激条件下,受试者完成听觉认知任务的反应时和正确率差异均无显著性意义。匀速旋转时,受试者N1P2和N2P3峰峰波幅相对于对照和四种角加速度作用时显著降低,靶信号P3潜伏期显著缩短。结论匀速旋转和恒角加速度前庭刺激对人体听觉认知活动效应明显不同:匀速旋转加快听觉认知活动,而恒角加速度抑制听觉认知活动。
Objective To observe the effects of different vestibular stimuli on auditory activity and ERPs in human. Methods Thirty-three undergraduates were subjected to four different angular acceleration trapezoidal stimulation of 0.6 ° / s2, 0.8 ° / s2, 1.0 ° / s2 and 1.2 ° / s2 respectively after the uniform rotation of vestibular stimulation was 10 ° / s for 150 s and completed Auditory cognitive task: The reciprocal of the odd number (target signal, T) of the Chinese Arabic digital signals 2 to 9 that occur with a reciprocal probability performs a key reaction and does not react with even numbers (non-target signals, NT). Subjects were recorded EEG and analyzed for ERPs. Results Under different vestibular stimulation conditions, there was no significant difference in the response time and the correct rate of the subjects’ completion of the auditory task. At constant rotation, the peak amplitude of N1P2 and N2P3 in subjects significantly decreased compared with the control and the four angular accelerations, and the latency of target P3 was significantly shortened. Conclusion The effects of uniform rotation and constant angular acceleration vestibular stimulation on human auditory cognitive activity are significantly different: uniform rotation accelerates auditory cognitive activity, while constant angular acceleration suppresses auditory cognitive activity.