Laboratoire de Psychopathologie et Neuropsychologie, EA 2027, Université Paris 8 Paris, France.
Front Psychol. 2013 Aug 27;4:539. doi: 10.3389/fpsyg.2013.00539. eCollection 2013.
Visual perception depends on the integration of local elements of a visual scene into a global frame. Evidence from behavioral studies shows that (1) the detection of the global frame is faster than the detection of the local parts, a phenomenon called the global advantage, and that (2) an interference of the global shape is also present during local processing. Together, these effects are called the global precedence effect (GPE). Even if the global advantage appears to impact neural processing as early as the first 100 ms post-stimulus, previous studies failed to find a global interference effect before 200 ms post-stimulus. Using for the first time a rapid display of letter component stimuli during a global/local selective task in which conditions with perceptual conflict, congruent and incongruent conditions were considered, the present event-related potential (ERP) study shows a global interference effect occurring as early as the time range of the N1 component. In particular, only congruent stimuli elicited similar N1 amplitude during the global and local tasks, whereas an increased of the N1 amplitude during the global task was observed (as compared to the local task) for both stimuli with perceptual conflict and incongruent stimuli. This finding corroborates the recent neural models of human visual perception.
视觉感知取决于将视觉场景的局部元素整合到全局框架中。来自行为研究的证据表明：(1) 全局框架的检测速度快于局部部分的检测，这种现象称为全局优势，并且 (2) 在局部处理过程中也存在全局形状的干扰。这些效应共同称为全局优先效应（GPE）。即使全局优势似乎早在刺激后 100 毫秒就对神经处理产生影响，但以前的研究未能在刺激后 200 毫秒之前发现全局干扰效应。本研究首次在全局/局部选择性任务中快速显示字母成分刺激，该任务考虑了知觉冲突、一致和不一致的条件，事件相关电位（ERP）研究表明，全局干扰效应早在 N1 成分的时间范围内发生。特别是，只有一致的刺激在全局和局部任务中引起相似的 N1 振幅，而对于具有知觉冲突的刺激和不一致的刺激，在全局任务中观察到 N1 振幅增加（与局部任务相比）。这一发现证实了最近的人类视觉感知神经模型。
