Voluntary task switching: Chasing the elusive homunculus
Voluntary task switching: Chasing the elusive homunculus
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DOI：
10.1037/0278-7393.31.4.683
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发表时间：
2005-07-01
影响因子：
2.6
通讯作者：
Logan, GD
中科院分区：
文献类型：
--
作者：
Arrington, CM;Logan, GD
在自主任务转换过程中，被试在一系列二价刺激下选择要执行的任务，需要自上而下的任务转换控制。实验1-3对比了自主任务转换和外显任务线索。选择行为表现出小，不一致的外部刺激特性的影响，支持自上而下控制任务选择的假设。转换成本较小时，受试者选择切换任务比指示时的外部线索。实验4-6将选择成本与转换成本分开。这些研究结果支持模型的任务切换，将自上而下的过程中的转换成本的帐户。任务转换程序捕获自上而下与自下而上过程的程度可能取决于程序提供的环境支持的程度。
In the voluntary task switching procedure, subjects choose the task to perform on a series of bivalent stimuli, requiring top-down control of task switching. Experiments 1-3 contrasted voluntary task switching and explicit task cuing. Choice behavior showed small, inconsistent effects of external stimulus characteristics, supporting the assumption of top-down control of task choice. Switch costs were smaller when subjects chose to switch tasks than when instructed by an external cue. Experiments 4-6 separated choice costs from switch costs. These findings support models of task switching that incorporate top-down processes in accounts of switch costs. The degree to which task switching procedures capture top-down versus bottom-up processes may depend on the extent of environmental support provided by the procedure.