University of Science and Technology of China.
J Cogn Neurosci. 1997 Fall;9(5):687-98. doi: 10.1162/jocn.1997.9.5.687.
The global precedence hypothesis (Navon, 1977) assumes that the processing of the global level of a hierarchical pattern precedes that of the local level. To explore further the nature of global and local processing of compound stimuli, we recorded the event-related brain potentials (ERPs) associated with ident@ing the global and local levels of nonlinguistic compound stimuli in a selective attention task. Wile subjects' behavioral responses were similar to those observed by Navon (1977), the analyses of ERP data showed that identification of the local level elicited longer N2 and P3 peak latencies with enhanced N2 and decreased P3 amplitudes relative to the identification of the global level. The inconsistency between the global and local levels made N2 and P3 amplitudes more negative with longer peak latencies. This interference effect on N2 and P3 amplitude and P3 latency was stronger on the local level than on the global level. The modulation of N2 by the consistency of the global and local levels observed in this and the previous (Heinze, Muente, et al., 1994) study suggests that the interference effect may be mediated by the early perceptual processing. Moreover, we found that the amplitude of an early posterior P1 component was modulated by attention to the global and local levels, being larger to the local target than to the global one. This PI effect gives no support to the notion that the variation of attentional spotlight determines the global precedence effect.
全局优先假设（Navon，1977）假设，在层次结构模式的全局级别和局部级别之间，处理全局级别的速度快于处理局部级别的速度。为了进一步探索复合刺激的全局和局部处理的本质，我们在选择性注意任务中记录了与识别非语言复合刺激的全局和局部水平相关的事件相关脑电位（ERP）。尽管被试的行为反应与 Navon（1977）观察到的反应相似，但 ERP 数据分析表明，与识别全局水平相比，识别局部水平会引起更长的 N2 和 P3 峰值潜伏期，并增强 N2 和降低 P3 振幅。全局水平和局部水平之间的不一致使得 N2 和 P3 振幅更负，峰值潜伏期更长。与全局水平相比，这种对 N2 和 P3 振幅和 P3 潜伏期的干扰效应在局部水平上更强。在这项研究和之前的研究（Heinze、Muente 等人，1994）中，观察到 N2 受到全局和局部水平一致性的调制，这表明干扰效应可能是由早期感知处理介导的。此外，我们发现，对全局和局部水平的注意会调制早期的后 P1 成分的振幅，局部目标的振幅大于全局目标的振幅。这种 PI 效应不支持注意力聚光灯的变化决定全局优先效应的观点。
