Abstract：
The C1 event-related potential (ERP) captures the earliest stage of feedforward processing in the primary visual cortex (V1). An ongoing debate is whether top-down selective attention can modulate the C1. One side of the debate pointed out that null findings appear to outnumber positive findings; thus, selective attention does not seem to influence the C1. However, this suggestion is not based on a valid approach to summarizing evidence across studies. Therefore, we conducted a systematic review and meta-analysis investigating the effects of selective attention on the C1, involving 47 experiments and 794 subjects in total. Despite heterogeneity across studies, results suggested that attention has a moderate effect on the C1 (Cohen\'s d z = 0.33, p < .0001); that is, C1 amplitude is larger for visual stimuli that are attended than unattended. These results suggest that C1 is affected by top-down selective attention.
摘要：
C1事件相关电位（ERP）捕获了初级视觉皮层（V1）中前馈处理的最早阶段。正在进行的辩论是自上而下的选择性注意力是否可以调节C1。辩论的一方指出，无效的调查结果似乎超过了积极的调查结果；因此，选择性注意似乎不会影响C1。然而,这一建议并非基于总结研究证据的有效方法.因此,我们进行了一项系统综述和荟萃分析,调查了选择性注意对C1的影响,共涉及47个实验和794名受试者.尽管研究存在异质性，结果表明，注意力对C1有中等影响(科恩的dz$${d}_z$$=0.33，p<0.0001)；也就是说，与无人值守的视觉刺激相比，C1振幅更大。这些结果表明，C1受到自上而下的选择性注意力的影响。
