The dorsal medial frontal cortex is sensitive to time on task, not response conflict or error likelihood.
The dorsal medial frontal cortex is sensitive to time on task, not response conflict or error likelihood.
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DOI：
10.1016/j.neuroimage.2010.12.027
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发表时间：
2011-07-15
期刊：
影响因子：
5.7
通讯作者：
Hirsch J
中科院分区：
文献类型：
--
作者：
Grinband J;Savitskaya J;Wager TD;Teichert T;Ferrera VP;Hirsch J
背内侧前额叶皮质（dMFC）在选择行为过程中高度活跃。尽管已经提出了许多模型来解释dMFC的功能，但冲突监测模型最具影响力。该模型假定dMFC主要参与检测相互竞争的反应之间的干扰，从而发出需要控制的信号。它准确地预测了不相容（高干扰）决策与相容（低干扰）决策相比，神经活动和反应时间（RT）会增加。然而，已有研究表明，即使没有做出决策，神经活动也会随着任务时间的增加而增加。因此，不相容试验中dMFC活动的增强可能源于更长的反应时间，而非反应冲突。这项研究表明：（1）冲突监测模型无法预测错误可能性与反应时间之间的关系；（2）dMFC的活动对一致性、错误可能性或反应冲突不敏感，而是与任务时间呈单调相关。
The dorsal medial frontal cortex (dMFC) is highly active during choice behavior. Though many models have been proposed to explain dMFC function, the conflict monitoring model is the most influential. It posits that dMFC is primarily involved in detecting interference between competing responses thus signaling the need for control. It accurately predicts increased neural activity and response time (RT) for incompatible (high-interference) vs. compatible (low-interference) decisions. However, it has been shown that neural activity can increase with time on task, even when no decisions are made. Thus, the greater dMFC activity on incompatible trials may stem from longer RTs rather than response conflict. This study shows that (1) the conflict monitoring model fails to predict the relationship between error likelihood and RT, and (2) the dMFC activity is not sensitive to congruency, error likelihood, or response conflict, but is monotonically related to time on task.
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