The role of prefrontal cortex and posterior parietal carter in task switching
The role of prefrontal cortex and posterior parietal carter in task switching
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DOI：
10.1073/pnas.240460497
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发表时间：
2000-11-21
影响因子：
11.1
通讯作者：
Carter, CS
中科院分区：
文献类型：
--
作者：
Sohn, MH;Ursu, S;Carter, CS
人类从一种认知任务转换到另一种认知任务的能力既包括没有外部刺激的内源性准备，也包括响应外部刺激的外源性调整。在一项与事件相关的功能性磁共振成像研究中，参与者执行两个任务，这两个任务要么相同（任务重复），要么不同（任务切换）。在半数实验中，任务重复或任务转换的前知是可用的。另一半，不是。内源性准备似乎涉及外侧前额叶皮层（BA 46/45）和后顶叶皮层（BA 40）。在准备过程中，有预见的下外侧前额叶皮层和上级后顶叶皮层的激活增加高于无预见的。外源性调节似乎一般涉及上级前额叶皮层（BA 8）和后顶叶皮层（BA 39/40）。在没有预知的任务切换期间，这些区域的激活相对高于没有预知的任务重复期间。这些结果表明，任务转换的内源性准备和外源性调整可能是涉及不同脑区的独立过程。
Human ability to switch from one cognitive task to another involves both endogenous preparation without an external stimulus and exogenous adjustment in response to the external stimulus. In an event-related functional MRI study, participants performed pairs of two tasks that are either the same (task repetition) or different (task switch) from each other. On half of the trials, foreknowledge about task repetition or task switch was available. On the other half, it was not. Endogenous preparation seems to involve lateral prefrontal cortex (BA 46/45) and posterior parietal cortex (BA 40), During preparation, higher activation increases in inferior lateral prefrontal cortex and superior posterior parietal cortex were associated with foreknowledge than with no foreknowledge. Exogenous adjustment seems to involve superior prefrontal cortex (BA 8) and posterior parietal cortex (BA 39/40) in general. During a task switch with no foreknowledge, activations in these areas were relatively higher than during a task repetition with no foreknowledge. These results suggest that endogenous preparation and exogenous adjustment for a task switch may be independent processes involving different brain areas.