模拟失重对快慢反应被试视觉选择注意ERPs的不同影响

发布时间：2018-04-29 04:24

本文选题：模拟失重 + 事件相关电位　；参考：《航天医学与医学工程》2005年06期

【摘要】：目的研究模拟失重对不同反应类型被试者脑功能影响的差异。方法14名右利手正常被试者。以头低位倾斜(-10°,HDT)为模拟失重,头高位倾斜(+20°,HUT)为对照。刺激为等概率出现在左、右视场的红、绿闪光刺激,要求被试者对靶刺激(红光或绿光,在被试者中交叉规定)进行方位区分反应(DR),忽略非靶刺激。每种体位2h,均作5套DR测试。记录9导脑电。结果1)根据反应时的长短将被试者分成快反应(n=7)和慢反应(n=7)两组,其事件相关电位(ERPs)的主要差异表现为快反应组的N1和P3的幅值更大、前脑区负向慢波NSW的潜伏期更短、幅值更大,提示快反应被试者的觉醒水平和注意程度较高、主动抑制能力较强,脑功能状态较好;2)HDT引起ERPs中P2和P3成分幅值的降低,慢反应组ERPs受HDT影响的程度比快反应组更显著。结论模拟失重对慢反应被试者ERPs的影响更严重,为航天脑功能的评价和航天员的选拔提供了一定的实验依据。
[Abstract]:Objective to study the effects of simulated weightlessness on brain function in subjects with different reaction types. Methods 14 healthy subjects with right handedness were enrolled. The head-low tilt (-10 掳HDT) was used as the simulation weight loss, and the head-high tilt (20 掳HUTs) was used as the control. The stimulus is an equal probability red and green flash stimulus in the left and right field of view, which requires the subjects to distinguish the direction of the target stimulus (red or green light, cross between the subjects) and ignore the non-target stimulus. Five sets of Dr tests were performed in each position for 2 h. 9 conduction EEG were recorded. Results 1) according to the length of reaction time, the subjects were divided into two groups: fast response group and slow response group. The main difference of the event-related potentials was that the amplitude of N1 and P3 in the fast response group was larger, and the latency of the negative slow wave NSW in the forebrain region was shorter than that in the fast response group. The amplitude was higher, which indicated that the quick response subjects had higher arousal level and attention level, stronger active inhibition ability, and better brain function. HDT could reduce the amplitude of P2 and P3 components in ERPs. The effect of HDT on ERPs in slow reaction group was more significant than that in fast reaction group. Conclusion simulated weightlessness has a more serious effect on ERPs of slow reaction subjects, which provides an experimental basis for the evaluation of spaceflight brain function and the selection of astronauts.
【作者单位】：徐州师范大学语言研究所北京航天医学工程研究所
【分类号】：R85

【相似文献】