模拟失重条件下与视觉注意关联的脑电位变化

为研究模拟失重对脑功能状态的影响，在９名正常被试者中比较了头低位倾斜（ＨＤＴ－模拟失重）和头高位倾斜（ＨＵＴ，对照）条件下视觉选择反应了事件关联电位（ＥＲＰｓ）。主要结果为：靶非靶闪光信号均引起显著的正慢电位；与ＨＵＴ比较，在ＨＤＴ条件下额区的正慢电位幅值显著下降且在非靶反应中更为突出，由于上述正慢电位可能与视觉选择反应中的注意过程有关，本文结果表明，在模拟失重条件下脑的功能状态发生明显变化，表现

Changes of Brain Potentials Related to Visual Attention during Simulated Weightlessness.

To study the possible effect of simulated weightlessness on brain function state,the brain event-related potentials (ERPs) during a simple visual selective response task were compared between head down tilt (HDT) and head up tilt (HUT) in 9 normal subjects.The results were:both the target(T) and non-target(NT) flash signals induced significant slow positive potentials which were supposed to be related to the attention activity;the amplitude of the positive potentials in the frontal regions decreased significantly especially for NT-ERPs during HDT as comprared with that during HUT.The data provide new evidence indicating that the ability of brain response declined during simulated weightlessness and more attention should be paid to the study of brain function during space flight.