Department of Home and Life Sciences, Gifu Women's University, 80, Taromaru, Gifu City 501-2592, Japan.
Biol Psychol. 2013 Feb;92(2):295-300. doi: 10.1016/j.biopsycho.2012.10.014. Epub 2012 Nov 24.
Investigations of executive control using a task-switching paradigm have consistently found longer reaction times for task-switch trials than task-repetition trials. This switch cost may result from interference by a stimulus-response (SR) rule carried over from the preceding alternative task. We examined event-related brain potential (ERP) evidence for such carry-over effects using a combined paradigm of task switching with Go/Nogo; Nogo trials, which require no response execution, should expose carry-over effects from preceding trials. On Go trials, twelve participants performed a button-pressing task in compatible (hand and signal direction consistent) and incompatible conditions, which switched predictably every three trials. Reaction times were longer on switch than on repetition trials. On compatible switch trials, a stimulus-locked lateralized readiness potential (sLRP) for Nogo stimuli revealed a positive dip, suggesting incorrect response activation in the early automatic process that was induced by a SR rule carried over from the preceding task.
使用任务转换范式进行的执行控制研究发现，任务转换试验的反应时间比任务重复试验长。这种转换成本可能是由于来自前一个替代任务的刺激-反应（SR）规则的干扰。我们使用任务转换和 Go/Nogo 的组合范式检查了事件相关脑电位（ERP）的这种转移效应的证据；不需要执行反应的 Nogo 试验应该会暴露出前一个试验的转移效应。在 Go 试验中，十二名参与者在手和信号方向一致的兼容条件和不一致的条件下执行按键任务，每三个试验可预测地切换。在转换试验中，反应时间比重复试验长。在兼容的转换试验中，对 Nogo 刺激的刺激锁定的侧准备电位（sLRP）显示出一个正的凹陷，这表明在由前一个任务传递的 SR 规则引起的早期自动过程中错误地激活了反应。
