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用事件相关电位(ERPs)研究视觉系统处理复合刺激图形的整体性质和局部性质的差别.实验发现,与辨别整体性质相比,辨别局部性质时,反应时延长,正确报告率降低,P1波幅度增高,N1波幅度降低,N2,P3波的峰潜伏期延长;整体和局部性质冲突时,P2波幅度增高,P3波幅度降低,N2,P3波的峰潜伏期延长.实验结果提示,大范围整体性质的优先性,发生在早期视知觉过程,处理整体性质和局部性质的注意机制可能不同.
Event-related potentials (ERPs) were used to study the difference of the global and local properties of the composite stimulus in the visual system.Experiments showed that compared with the identification of the global properties, when the local properties were identified, the response time was prolonged and the correct reporting rate was reduced. The amplitudes of N1 wave decreased and the peak latency of N2 and P3 wave prolonged. When the global and local properties collided, the amplitude of P2 wave increased and the amplitude of P3 wave decreased, and the peak latency of wave of N2 and P3 prolonged.The experimental results suggested that the large-scale global property The priority mechanisms that occur in the early visual perception process may be different from the attentional mechanisms that deal with the overall and local properties.