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比较了１５名正常被试者在２ｈＨＤＴ（－１０°）和ＨＵＴ（＋２０°）期间，对来自左（ＬＶＦ）、右（ＲＶＦ）视场的红、绿发光二极管（ＬＥＤ）闪光信号进行选择区分反应的ＥＲＰｓ中正慢电位的变化。要求被试者对出现在ＬＶＦ或ＲＶＦ的靶信号分别进行向左或右拨开关反应，对非靶信号（Ｎ）不作反应。在９个脑区记录脑电。在每一体位均进行视对照（ＶＣ）和５套选择区分反应记录。以刺激后０．３～０．５５ｓ的平均电位作为正慢电位（Ｐ４００）的平均幅值。主要结果如下：（１）与ＨＵＴ比较，Ｐ４００的平均幅值在ＨＤＴ下显著下降，在第２、３及５套记录中最为显著；（２）Ｐ４００平均幅值下降的空间特征表现为：ａ．对ＲＶＦ信号比对ＬＶＦ信号的反应更为显著；ｂ．后脑区最为显著，额区则表现出分化的特点。本文的结果进一步表明在模拟失重条件下脑的功能状态发生了变化，且表现出一定的空间特征
15 normal subjects were compared between red and green light-emitting diode (LED) flash signals from the left (LVF), right (RVF) field of view at 2 hHDT (-10 °) and HUT (+20 °) Responsive ERPs are slow potential changes. Subjects were asked to perform a leftward or rightward dial switch on a target signal appearing in LVF or RVF, respectively, without reacting to a non-target signal (N). EEG was recorded in 9 brain regions. In each position were controlled (VC) and 5 sets of selective response records. The average amplitude of 0.3 ~ 0.55s after stimulation as positive slow potential (P400) average amplitude. The main results are as follows: (1) Compared with HUT, the average amplitude of P400 decreased significantly under HDT, which was the most significant among the second, third and fifth sets of records; (2) The spatial characteristics of P400 average amplitude decreased as follows: a . The response of RVF signal to LVF signal is more significant; b. The most prominent area of the brain, the frontal area showed the characteristics of differentiation. The results in this paper further demonstrate that the functional status of the brain changes under simulated weightlessness and exhibits certain spatial characteristics