Behavioural and electrophysiological measures of task switching during single and mixed-task conditions
Behavioural and electrophysiological measures of task switching during single and mixed-task conditions
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DOI：
10.1016/j.biopsycho.2005.11.009
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发表时间：
2006-06-01
影响因子：
2.6
通讯作者：
Pushkar, Dolores
中科院分区：
文献类型：
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作者：
Goffaux, Philippe;Phillips, Natalie A.;Pushkar, Dolores
为了了解大脑如何准备和执行任务需求的转换，我们使用线索设计测量了在单一和混合任务块中与表现相关的反应时间（RT）、准确性和事件相关的脑电位。我们的研究结果表明，在混合任务块中重复的试验（重复试验）比在单一任务块中重复的试验要求更高，这反映在RT混合成本的存在和重复试验中较小的目标锁定正性（P3b）的存在上。在混合任务块中，重复和转换试验也有所不同，重复试验显示出更多的准备（更大的线索锁定负性），更有效的目标加工（更大的目标锁定P3b）和更短的RTs。此外，尽管在RT上重复试验和转换试验相等，但线索锁定的负性差异仍然存在，这表明这种负性差异是特定于转换过程的。我们的结果讨论了现有的模型的任务切换。(c) 2005 Elsevier B.V.版权所有
In order to understand how the brain prepares for and executes a switch in task demand, we measured reaction time (RT), accuracy, and event-related brain potentials associated with performance in single and mixed-task blocks using a cued design. Our results show that trials which repeat in a mixed-task block (repeat trials) were more demanding than trials which repeated in a single-task block, as reflected by the presence of a RT mixing cost and by the presence of a smaller target-locked positivity (P3b) on repeat trials. Within a mixed-task block, repeat and switch trials also differed, where repeat trials showed evidence of greater preparation (larger cue-locked negativity), more efficient target processing (larger target-locked P3b), and shorter RTs. In addition, the cue-locked negativity difference remained despite equating repeat and switch trials on RT, suggesting that this negativity difference is specific to the switching process. Our results are discussed in light of existing models of task switching. (c) 2005 Elsevier B.V. All rights reserved.