fMRI evidence for a dual process account of the speed-accuracy tradeoff in decision-making.
fMRI evidence for a dual process account of the speed-accuracy tradeoff in decision-making.
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fMRI证明了双重流程在决策中的速度准确性权衡。
DOI：
10.1371/journal.pone.0002635
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发表时间：
2008-07-09
期刊：
影响因子：
3.7
通讯作者：
Marois, Rene
中科院分区：
文献类型：
--
作者：
Ivanoff, Jason;Branning, Philip;Marois, Rene
决策的速度和准确性有一个众所周知的交易关系：匆忙的决定更容易出错，而仔细，准确的判断需要更多的时间。尽管这种速度-准确性权衡（SAT）在决策中普遍存在，但其神经基础仍然未知。使用功能性磁共振成像（fMRI），我们发现，强调速度的感知决策的准确性为代价，降低了大量的证据相关的活动在外侧前额叶皮层。此外，外侧前额叶皮层活动中的速度-准确性差异与信号检测理论的决策标准度量中的速度-准确性差异相关。我们还表明，相同的指令增加基线活动的背内侧皮质区参与内部生成的行动。这些发现表明，SAT不仅通过调节用于做出决定的外部感官证据的数量，而且还通过调节做出反应的内部冲动来实现。我们建议，这些过程联合收割机，以控制时间动态的速度-精度权衡决策。
The speed and accuracy of decision-making have a well-known trading relationship: hasty decisions are more prone to errors while careful, accurate judgments take more time. Despite the pervasiveness of this speed-accuracy trade-off (SAT) in decision-making, its neural basis is still unknown. Using functional magnetic resonance imaging (fMRI) we show that emphasizing the speed of a perceptual decision at the expense of its accuracy lowers the amount of evidence-related activity in lateral prefrontal cortex. Moreover, this speed-accuracy difference in lateral prefrontal cortex activity correlates with the speed-accuracy difference in the decision criterion metric of signal detection theory. We also show that the same instructions increase baseline activity in a dorso-medial cortical area involved in the internal generation of actions. These findings suggest that the SAT is neurally implemented by modulating not only the amount of externally-derived sensory evidence used to make a decision, but also the internal urge to make a response. We propose that these processes combine to control the temporal dynamics of the speed-accuracy trade-off in decision-making.
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