Kimura Motohiro, Katayama Jun'ichi, Murohashi Harumitsu
Graduate School of Education, Hokkaido University, Kita-11 Nishi-7, Kita-ku, Sapporo 060-0811, Japan.
Int J Psychophysiol. 2008 Feb;67(2):101-13. doi: 10.1016/j.ijpsycho.2007.10.009. Epub 2007 Nov 1.
To elucidate the attention switching function of a memory-comparison-based change detection system in the visual modality, the effects of task-irrelevant infrequent stimulus-size decrements that engaged memory-comparison-based change detection as well as stimulus-size increments that engaged memory-comparison-based change detection and refractoriness-based rareness detection on behavioral and event-related brain potential (ERP) measures were assessed using the distraction paradigm. Both size increments and size decrements caused distraction in forced-choice task performance, which was mirrored by a posterior negativity (peaking at around 240-260 ms, posterior N2) and a broad positivity (420-460 ms, P3a) that reflected attentional capture. Preceding these effects, size increments elicited a posterior negativity (120-140 ms, change-related negativity), while size decrements elicited a posterior positivity (140-160 ms, change-related positivity) and an anterior positivity (160-180 ms, frontal positivity). Taken together, these results indicate an attention switching function of a memory-comparison-based change detection system in the visual modality, which is most probably indexed by change-related positivity.
为了阐明视觉模态中基于记忆比较的变化检测系统的注意力切换功能，我们使用分心范式评估了与基于记忆比较的变化检测相关的任务无关的罕见刺激大小减小以及与基于记忆比较的变化检测和基于不应期的稀有性检测相关的刺激大小增加对行为和事件相关脑电位（ERP）测量的影响。刺激大小增加和减小都会导致强制选择任务表现中的分心，这反映在一个后负波（在240 - 260毫秒左右达到峰值，后N2）和一个广泛的正波（420 - 460毫秒，P3a）上，它们反映了注意力的捕获。在这些效应之前，刺激大小增加引发一个后负波（120 - 140毫秒，变化相关负波），而刺激大小减小引发一个后正波（140 - 160毫秒，变化相关正波）和一个前正波（160 - 180毫秒，额部正波）。综上所述，这些结果表明视觉模态中基于记忆比较的变化检测系统具有注意力切换功能，这很可能由变化相关正波来表征。
