Perceptual Learning and Decision-Making in Human Medial Frontal Cortex
Perceptual Learning and Decision-Making in Human Medial Frontal Cortex
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DOI：
10.1016/j.neuron.2011.02.054
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发表时间：
2011-05-12
期刊：
影响因子：
16.2
通讯作者：
Haynes, John-Dylan
中科院分区：
文献类型：
--
作者：
Kahnt, Thorsten;Grueschow, Marcus;Haynes, John-Dylan
知觉学习伴随着早期感觉表征的变化这一主流观点最近受到了挑战。在这里，我们测试了知觉学习可以通过涉及更高决策领域的变化的强化学习来解释的想法。我们对受试者进行了为期4天的方位辨别任务的训练，包括反馈，在第一天和最后一天收集fMRI数据。强化学习模型很好地解释了行为的改善，在该模型中，学习导致对感觉信息的增强读出，从而建立决策变量的噪声稳健表示。我们发现，刺激方向编码在早期视觉和更高级的皮质区域，如外侧顶叶皮质和前扣带回皮质(ACC)。然而，只有ACC中的活动模式跟踪了学习过程中决策变量的变化。这些结果为高阶区知觉学习相关的变化提供了强有力的证据，并表明知觉学习和奖赏学习是基于共同的神经生物学机制。
The dominant view that perceptual learning is accompanied by changes in early sensory representations has recently been challenged. Here we tested the idea that perceptual learning can be accounted for by reinforcement learning involving changes in higher decision-making areas. We trained subjects on an orientation discrimination task involving feedback over 4 days, acquiring fMRI data on the first and last day. Behavioral improvements were well explained by a reinforcement learning model in which learning leads to enhanced readout of sensory information, thereby establishing noise-robust representations of decision variables. We find stimulus orientation encoded in early visual and higher cortical regions such as lateral parietal cortex and anterior cingulate cortex (ACC). However, only activity patterns in the ACC tracked changes in decision variables during learning. These results provide strong evidence for perceptual learning-related changes in higher order areas and suggest that perceptual and reward learning are based on a common neurobiological mechanism.