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目的探讨在认知活动中左右脑对左右视场 (LVF ,RVF)信号的反应特性。方法对 2 3名被试者在 3种任务条件下 9个部位的与LVF和RVF相应的事件关联电位 (ERPs)进行了比较。刺激信号为位于LVF和RVF中的红、绿闪光 ,等概率随机出现 ,交叉地规定红或绿闪光为靶信号 (T)。 3种任务是 :视对照 (VC) ;简单选择反应 (SR) ;选择区分反应 (DR) ,对LVF和RVF的T分别向左和右拨开关。结果 ( 1 )除外源性的P1和N1成分外 ,与LVF和RVF相应的ERPs的差别突出地表现在左额区 (F5) ,即在SR和DR条件下RVF的T -ERPs及NT -ERPs中出现显著的负慢波 ,而右脑对信号的方位不敏感 ;( 2 )左右脑对LVF和RVF信号反应的不对称性与认知状态有关 :靶信号时与对侧视场相应的ERPs左脑比右脑显著偏负 ,而非靶信号则是与同侧视场相应的ERPs在左、右脑出现显著差别 ,且是右脑 (F5,C5)偏负。结论左右脑对靶和非靶信号的反应不同提示二者在信号加工过程中的不同功能 ;左额区对RVF中靶和非靶信号的负慢电位反应提示右视场中具有心理意义的信号可能引起较大的心理负荷。
Objective To investigate the response of left and right visual field (LVF, RVF) signals in cognitive activity. Methods Twenty-three subjects were compared for event-related potentials (ERPs) with LVF and RVF at nine sites under the three task conditions. Stimuli signals are red and green flashes in LVFs and RVFs, with random probabilities that cross-define the red or green flash as the target signal (T). The three tasks were: visual control (VC); simple choice of response (SR); selective distinction of response (DR), left and right dial switches for LVF and RVF, respectively. Results (1) In addition to exogenous P1 and N1 components, the differences in ERPs corresponding to LVF and RVF were prominently shown in the left frontal region (F5), ie, T-ERPs and NT-ERPs of RVF under SR and DR conditions (2) The left and right brain response to LVF and RVF signal asymmetry and cognitive status: the target signal and contralateral field of the corresponding ERPs left The brain is significantly more negative than the right brain, whereas non-target signals are significantly different in the left and right brain compared with those in the ipsilateral field, and are negative in the right brain (F5, C5). Conclusion The different responses of left and right brain to target and non-target signals suggest different functions of the left and right brain during signal processing. The negative and slow potentials of target and non-target signals in RVF suggest the signal of psychological significance in right field May cause a greater psychological burden.