Department of Psychological & Brain Sciences, G60 PBSB, University of Iowa, Iowa City, IA, 52242, USA.
Psychon Bull Rev. 2021 Aug;28(4):1224-1232. doi: 10.3758/s13423-021-01903-2. Epub 2021 Mar 10.
Two related accounts of dual-task costs-multiple resource competition and crosstalk-explain why costs can be reduced when there is less overlap between the two tasks. However, distinguishing between competition for limited resources and crosstalk between concurrently performed operations has proven difficult. In the present study, we compared these two accounts with a dual-task paradigm in which participants were required to coordinate visual-manual and auditory-manual tasks with experimentally induced action effects. Critically, stimulus and response modalities were constant across conditions; what differed was the conceptual relationship between stimuli and action effects such that conceptual overlap was present either within or between tasks. We observed larger dual-task costs when related conceptual codes were present between tasks. We conclude that these results are best supported by the crosstalk account and that postresponse action effects are integrated into task representations engaged by central operations during response selection.
两种关于双重任务成本的相关解释——多资源竞争和串扰——解释了为什么当两个任务之间的重叠较少时，成本可以降低。然而，区分有限资源的竞争和同时进行的操作之间的串扰一直很困难。在本研究中，我们通过一种双重任务范式将这两种解释与实验诱导的动作效果进行了比较，该范式要求参与者协调视觉-手动和听觉-手动任务。关键是，在不同条件下，刺激和反应模态保持不变；不同的是刺激和动作效果之间的概念关系，使得概念重叠存在于任务内部或任务之间。当任务之间存在相关的概念代码时，我们观察到更大的双重任务成本。我们的结论是，这些结果最好由串扰解释支持，并且在响应选择期间，中央操作将反应后动作效果整合到所涉及的任务表示中。
