脳内報酬情報処理に及ぼす知覚的暖昧性の影響 [in Japanese] Differential Reward Prediction on Salient and Uncertain Perception as Revealed by Random Dot Motion Stimuli and fMRI [in Japanese]
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To investigate influence of perceptual saliency on reward processing in the brain, we examined reward-related fMRI activity for random-dot-motion stimuli with different coherence levels. After conditioning delivery of juice reward or control solution with a direction (leftward or rightward) of 100%-coherence random-dot-motion, subjects' brain activity was examined for trials with high and low coherence stimuli. Reward-related activations were found in the caudate head for high coherence trial but in the medial prefrontal cortex (MPC) for low coherence trial. The results suggest differential involvement of the caudate head and MPC in reward prediction for different saliency stimuli.
- The Brain & Neural Networks
The Brain & Neural Networks 15(1), 3-17, 2008-03-05
Japanese Neural Network Society