Voluntary selection of task sets revealed by functional magnetic resonance Imaging
Voluntary selection of task sets revealed by functional magnetic resonance Imaging
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DOI：
10.1162/jocn.2006.18.3.388
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发表时间：
2006-03-01
影响因子：
3.2
通讯作者：
von Cramon, DY
中科院分区：
文献类型：
--
作者：
Forstmann, BU;Brass, M;von Cramon, DY
在日常生活中，我们必须有选择地调整我们的行为，以适应不同的情况和任务。在认知心理学中，这种适应行为可以用任务转换范式来研究。然而，与日常生活不同的是，在实验中，参与者被明确告知要执行哪项任务。目前的功能性磁共振成像（fMRI）研究的目的是调查参与者可以自己决定执行哪项任务时的相关过程。选择的任务数量在强迫条件（没有选择）和两个自愿选择条件（两个或三个选择）之间变化。我们希望找到更长的反应时间，以及更高的激活中扣带回皮质的选择条件相比，没有选择的条件。功能磁共振成像结果显示了显着的激活差异的选择条件与无选择的条件。在选择性对照中，在扣带喙区（RCZ）、上级顶叶小叶和顶内沟后部均发现激活。这些激活显示三个和两个选择之间没有选择特异性差异。最后，一个事后分析表明，在RCZ的激活是不相关的更高的任务依赖的反应冲突时，参与者可以选择一个任务集。总之，这些发现表明，不同的大脑区域参与了抽象任务集信息的自愿选择。
in everyday life, we have to selectively adapt our behavior to different situations and tasks. In cognitive psychology, such adaptive behavior can be investigated with the task-switching paradigm. However, in contrast to everyday life, in experiments participants are unequivocally told which task to perform. The present functional magnetic resonance imaging (fMRI) study was set out to investigate processes that are relevant when participants can decide by their own which task to perform. The number of tasks to choose from was varied between a forced condition (no choice) and two voluntary selection conditions (two or three choices). We expected to find prolonged reaction times as well as higher activations within the midcingulate cortex for the choice conditions compared to the no-choice condition. The fMRI results revealed a significant activation difference for the choice conditions versus the no-choice condition. For the choice contrast, activation was found in the rostral cingulate zone (RCZ) as well as the superior parietal lobule and the posterior part of the intraparietal sulcus. These activations revealed no selection-specific difference between three and two choices. Finally, a post hoc analysis showed that the activation in the RCZ is not associated with higher task-dependent response conflict when participants can select a task set. Taken together, these findings indicate that distinct brain areas are involved in the voluntary selection of abstract task set information.