At your own peril: An ERP study of voluntary task set selection processes in the medial frontal cortex
At your own peril: An ERP study of voluntary task set selection processes in the medial frontal cortex
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DOI：
10.3758/cabn.7.4.286
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发表时间：
2007-12-01
影响因子：
2.9
通讯作者：
Bledowski, Christoph
中科院分区：
文献类型：
--
作者：
Forstmann, Birte U.;Ridderinkhof, K. Richard;Bledowski, Christoph
任务转换范式是研究在不断变化的环境中对不同备选方案进行选择的常用工具。功能性神经影像学已经指出了后内侧额叶皮层和后顶叶皮层在任务集的自愿选择中的作用。在本研究中，我们着手调查这些代理相关的过程（在任务选择与无选择条件）使用事件相关脑电位（ERP）的时间动力学。结果显示，一系列ERP成分的代理相关调制，包括（1）早期顶枕激活，采取反映选择与没有选择的评价，（2）随后的内侧额叶表达的任务集之间的自愿选择，（3）CNV样的持续负性准备的目标，（4）在一个新的任务集，（5）在一个新的任务集，（6）在一个新的任务集，（7）在一个新的任务集。（4）目标诱导的N210-P210复合体，用于反映早期感觉知觉处理;和（5）目标诱导的P3，与刺激及其指定反应的评估相关，维斯于选择的任务集和竞争的任务集。总之，这些结果表明，在任务之间进行选择的机会会引起内侧额叶皮层的活动，与自愿任务集选择有关，但也会在不同时间点激活其他一些大脑区域，不一定被功能性神经成像捕获。
A tool that is commonly used to investigate selection among different altematives in a changing environment is the task-switching paradigm. Functional neuroimaging has pointed out a role for the posterior medial frontal cortex and the posterior parietal cortex in the voluntary selection of task sets. In the present study, we set out to investigate the temporal dynamics of these agency-related processes (in task choice vs. no-choice conditions) using event-related brain potentials (ERPs). The results revealed agency-related modulations of a series of ERP components, including (1) an early parieto-occipital activation, taken to reflect the evaluation of choice versus no choice; (2) a subsequent medial frontal expression of the voluntary selection between task sets; (3) a CNV-like sustained negativity in preparation for the target; (4) a target-induced N210-P210 complex, taken to reflect early sensory-perceptual processing; and (5) a target-induced P3, associated with the evaluation of the stimulus and its designated response vis-h-vis the chosen versus competing task sets. Together, these results indicate that the opportunity to choose between tasks invokes activity ongulatmg from the medial frontal cortex, associated with voluntary task set selection, but also activation at different time points in a number of other brain areas, not necessarily captured by functional neuroimaging.