GRADED CAPACITY-SHARING IN DUAL-TASK INTERFERENCE
GRADED CAPACITY-SHARING IN DUAL-TASK INTERFERENCE
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DOI：
10.1037/0096-1523.20.2.330
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发表时间：
1994-04-01
影响因子：
2.1
通讯作者：
PASHLER, H
中科院分区：
文献类型：
--
作者：
PASHLER, H
研究表明，双任务干扰是由一个中心瓶颈（连同反应分组和受损的准备）引起的。然而，在这些实验中，对第一反应的强调可能会阻碍任务之间的处理资源共享。在本实验中，指令同等重视2个选择反应时任务，其中刺激同时呈现在20%的试验。与资源的分级权衡相比，瓶颈预测2个任务的interresponse间隔分布的双峰性，反映了2个可能的顺序，其中可能执行各自的中央阶段。大多数受试者表现出这种双峰性，沿着其他瓶颈迹象;其余受试者表现出反应分组的证据。数据表明，瓶颈是结构性的，而不是战略性的，使资源的分级共享不太可行。
Research suggests that dual-task interference is caused by a central bottleneck (together with response grouping and impaired preparation). The emphasis placed on the 1st response in these experiments, however, may have discouraged the sharing of processing resources between tasks. In the present experiment, instructions placed equal emphasis on 2 choice reaction-time tasks in which stimuli were presented simultaneously on 20% of the trials. In contrast to a graded trade-off of resources, a bottleneck predicts bimodality in the distribution of interresponse intervals for the 2 tasks, reflecting the 2 possible orders in which their respective central stages might be performed. Most subjects showed such a bimodality, along with other signs of a bottleneck; the remainder showed evidence of response grouping. The data suggest that the bottleneck is structural rather than strategic and make the graded sharing of resources less plausible.