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采用事件相关电位(Event-Related Potential,ERP)技术考察了无空间线索化下视觉注意资源在不同空间等级的分布情况。通过“预警信号-目标探测”范式,目标刺激随机出现在直径视角为3.2°、6.4°以及9.6°的三个等级圆上。反应时显示:对目标刺激的探测速度随注意范围增大而下降。脑电显示:三种条件下目标刺激诱发的N1和P3分别产生了不同程度的分离,主要表现为两成分的波幅随注意范围增大而减小。这表明个体在无空间线索化下可能自动地选择对不同空间等级进行资源分配。
Event-related potential (ERP) technique was used to investigate the distribution of visual attention resources in different spatial levels without spatial clue. Through the “Warning Signal - Target Detection” paradigm, the target stimuli appear randomly on three levels of circles with diameters of 3.2 °, 6.4 ° and 9.6 °. Response time shows: the target of the speed of detection of the stimulus with attention to the scope of increase and decline. The EEG showed that the N1 and P3 induced by the target stimuli under the three conditions had different degrees of separation, mainly as the amplitude of the two components decreased with increasing attention range. This indicates that an individual may automatically choose to allocate resources to different spatial levels without spatial cues.