OBJECTIVE To examine whether the occipito-temporal visual N700 component of the event-related potential is sensitive to stimulus probabilities. METHODS P1, N1, P3, and, in particular, the occipito-temporal N700 component of the event-related potential were analysed in response to frequent and rare non-target letters of a continuous performance task in 200 healthy adolescents. Additionally, amplitude habituation with time was examined for the occipito-temporal N700 and N1 components. RESULTS The visual P1, N1, and occipito-temporal N700 components were significantly larger in response to rare letters than to frequent letters, whereas the P3 component demonstrated no amplitude difference. Over time, the occipito-temporal N700 amplitude decreased in response to the rare letters, while the N1 amplitude increased, to both, frequent and rare letters. CONCLUSIONS This study provides first evidence that the visual occipito-temporal N700 is sensitive to stimulus probabilities, suggesting an enhanced post-processing of rare stimuli in secondary visual areas. The distinct habituation patterns of occipito-temporal N700 and N1 amplitudes distinguish repetition effects on stimulus post-processing (N700) from those on perception (N1). SIGNIFICANCE The enhanced N700 component to rare stimuli might reflect an orienting response and underlying attentional processes. The N700 sensitivity to stimulus probabilities should be examined in patient groups with attentional deficits.

中文翻译：

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刺激概率影响事件相关电位的视觉 N700 组件

目的检查事件相关电位的枕颞视觉 N700 成分是否对刺激概率敏感。方法 P1、N1、P3，特别是事件相关电位的枕颞 N700 成分，分析了 200 名健康青少年对连续表现任务中频繁和罕见的非目标字母的反应。此外，还检查了枕颞 N700 和 N1 分量随时间的振幅习惯。结果 视觉 P1、N1 和枕颞 N700 分量对稀有字母的反应显着大于对频繁字母的反应，而 P3 分量显示没有幅度差异。随着时间的推移，枕颞 N700 振幅对稀有字母的反应降低，而 N1 振幅增加，既包括频繁字母，也包括稀有字母。结论 本研究首次提供了视觉枕颞 N700 对刺激概率敏感的证据，表明次级视觉区域对罕见刺激的后处理得到增强。枕颞 N700 和 N1 振幅的不同习惯模式将刺激后处理 (N700) 的重复效应与感知 (N1) 的重复效应区分开来。意义 对罕见刺激的增强 N700 成分可能反映了定向反应和潜在的注意过程。应在有注意力缺陷的患者组中检查 N700 对刺激概率的敏感性。枕颞 N700 和 N1 振幅的不同习惯模式将刺激后处理 (N700) 的重复效应与感知 (N1) 的重复效应区分开来。意义 对罕见刺激的增强 N700 成分可能反映了定向反应和潜在的注意过程。应在有注意力缺陷的患者组中检查 N700 对刺激概率的敏感性。枕颞 N700 和 N1 振幅的不同习惯模式将刺激后处理 (N700) 的重复效应与感知 (N1) 的重复效应区分开来。意义 对罕见刺激的增强 N700 成分可能反映了定向反应和潜在的注意过程。应在有注意力缺陷的患者组中检查 N700 对刺激概率的敏感性。