Switching between simple response-sets: inferences from the lateralized readiness potential
Switching between simple response-sets: inferences from the lateralized readiness potential
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DOI：
10.1016/s0926-6410(03)00110-1
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发表时间：
2003-07-01
期刊：
影响因子：
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通讯作者：
Yu, YT
中科院分区：
文献类型：
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作者：
Hsieh, S;Yu, YT
行为研究已经证明，任务转换比任务重复会产生更长的反应时间，而关于即将到来的任务的提前提示信息会减少平均反应时间。本研究使用P-300峰值潜伏期和刺激锁定和反应锁定两个偏侧化就绪电位(LRP)间隔来推断任务切换和任务提示效应的位置，以及它们在基本任务加工链中如何相互作用。参与者按随机顺序执行两项任务，因此在每一次试验中，他们要么重复上一次试验中的任务，要么切换到另一项任务。在一种情况下，每个刺激之前都有一个提示，告诉参与者要执行两项任务中的哪一个；而在另一种情况下，每个刺激之前都有一个非信息性的提示。结果表明，切换的平均反应时间和刺激锁定的LRP间期都比重复试验长，而P-300峰潜伏期和反应锁定的LRP间期在两个试验中是相同的。同样，无任务提示条件下的反应时和刺激锁定的LRP间期都比任务提示条件下的长，而P-300峰潜伏期和反应锁定的LRP间期在两种条件下是相同的。最后，任务转换和任务线索效应表现出近似相加的效应，说明这两个因素对不同的阶段加工有不同的影响。我们认为，任务转换通过前一个任务的延续启动效应导致反应选择过程的延长，而任务提示缩短了切换和重复实验中反应选择之前的早期过程的持续时间。(C)2003爱思唯尔B.V.保留所有权利。
Behavioral studies have documented that task switching incurs a longer reaction time than task repetition, and that advance cueing information about the forthcoming task reduces mean reaction time. The present study used P-300 peak latency and two lateralized readiness potential (LRP) intervals - stimulus-locked and response-locked - to infer the loci of task switch and task-cueing effects and how they may interact in the basic task processing chain. Participants performed two tasks in a random order, so that on each trial they either repeated the task from the previous trial or switched to another task. In one condition, each stimulus was preceded by a cue informing participants which of the two tasks to perform; and in the other condition, each stimulus was preceded by a non-informative cue. Results indicated that both mean reaction times and the stimulus-locked LRP intervals were longer for switch than repeated trials, whereas P-300 peak latencies and response-locked LRP intervals were identical for both trials. Similarly, both reaction times and the stimulus-locked LRP intervals were longer for no task-cueing than for task-cueing conditions, and P-300 peak latencies and the response-locked LRP intervals were identical for both conditions. Finally, task switch and task-cueing effects appeared to be approximately additive, indicating the two factors influence distinct stage processes. We suggest that task switching resulted in prolongation of the response selection process by carry-over priming effects from the previous task, whereas task-cueing shortened the duration of the earlier process before response selection on both switch and repeated trials. (C) 2003 Elsevier B.V. All rights reserved.