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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的事件关联电位（ＥＲＰｓ）。主要结果为：靶和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，表现为注意过程中主动抑制活动的减弱。
To investigate the effect of simulated weightlessness on brain functional status, event-related potentials (ERPs) for visual-selective responses under head-tilt (HDT-simulated weightlessness) and head-tilt (HUT, control) were compared among nine normal subjects ). The main results were as follows: Both target and non-target flash signals caused significant positive and slow potentials. Compared with HUT, the positive and slow potential amplitudes of the frontal area decreased significantly under HDT and were more prominent in non-target response. Since the positive and slow potentials mentioned above may be related to the attentional processes in the visual selection reaction, the results of this paper show that the functional state of the brain changes significantly under simulated weightlessness, manifested as a decrease in active inhibitory activity during attentional processes.