The cost of a voluntary task switch
The cost of a voluntary task switch
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DOI：
10.1111/j.0956-7976.2004.00728.x
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发表时间：
2004-09-01
影响因子：
8.2
通讯作者：
Logan, GD
中科院分区：
文献类型：
--
作者：
Arrington, CM;Logan, GD
任务转换范式被广泛用于研究执行控制。然而，标准范例可能不需要主动控制来切换任务。我们研究了志愿任务切换，让受试者选择任务执行一系列的二价刺激。受试者对个位数进行奇偶性或大小判断。指令是以同样的频率和随机顺序执行这两项任务。刺激反应间期（RSI）为100或1，000 ms，在两个阻滞之间进行操作。任务交替慢于任务重复，这种开关的成本是在短RSI比长RSI（310和94毫秒，分别）。此外，受试者产生更多的任务重复比预期的，如果任务是在一个随机的顺序进行。这些结果表明，成本与自愿的任务切换，当受试者必须积极控制的任务进行选择。
Task-switching paradigms are widely used to study executive control. However, standard paradigms may not require active control to switch tasks. We examined voluntary task switching by having subjects choose which task to perform on a series of bivalent stimuli. Subjects performed parity or magnitude judgments on single digits. Instructions were to perform the two tasks equally often and in a random order. The response-to-stimulus interval (RSI) was either 100 or 1,000 ms, manipulated between blocks. Task alternations were slower than task repetitions, and this switch cost was greater at the short RSI than at the long RSI (310 and 94 ms, respectively). Additionally, subjects produced more task repetitions than expected if the tasks were performed in a random sequence. These results show costs associated with a voluntary task switch, when subjects must actively control the choice of the task to be performed.