Functional Neuroimaging Laboratory, School of Psychology, University of Newcastle, Callaghan, Australia.
Psychophysiology. 2010 Mar 1;47(2):365-86. doi: 10.1111/j.1469-8986.2009.00932.x. Epub 2009 Dec 7.
In task-switching paradigms, reaction time (RT) switch cost is eliminated on trials after a no-go trial (no-go/go sequence effect). We examined the locus of no-go interference on task-switching performance by comparing the event-related potential (ERP) time course of go/go and no-go/go sequences from cue onset to response execution. We also examined whether noninformative trials (i.e., delayed reconfiguration, no response inhibition) produce similar sequence effects. Participants switched using informative and noninformative cues (Experiment 2) intermixed with no-go trials (Experiment 1). Repeat RT was slower for both no-go/informative (pNG/I) and noninformative/informative (pNI/I) than informative/informative sequences. ERPs linked to anticipatory preparation showed no effect of trial sequence. ERPs indicated that pNG/I sequences reduce response readiness whereas pNI/I sequences reduce repetition benefit for repeat trials. Implications for task-switching models are discussed.
在任务转换范式中，在无反应试验（无反应/有反应序列效应）之后的试验中，反应时间（RT）转换成本被消除。我们通过比较从线索出现到反应执行的有反应/有反应和无反应/有反应序列的事件相关电位（ERP）时间进程，来研究任务转换性能中无反应干扰的位置。我们还检查了非信息性试验（即，延迟重新配置，无反应抑制）是否会产生类似的序列效应。参与者使用信息性和非信息性线索（实验 2）与无反应试验（实验 1）混合进行切换。与信息性/信息性序列相比，无反应/信息性（pNG/I）和非信息性/信息性（pNI/I）的重复 RT 都更慢。与试验序列无关的 ERP 表明，pNG/I 序列降低了反应准备程度，而 pNI/I 序列降低了重复试验的重复收益。讨论了对任务转换模型的影响。
