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The Journal of Neuroscience, February 18, 2004, 24(7):1660-1665; doi:10.1523/JNEUROSCI.3417-03.2004
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BRIEF COMMUNICATION
A Neural Correlate of Reward-Based Behavioral Learning in Caudate Nucleus: A Functional Magnetic Resonance Imaging Study of a Stochastic Decision Task
Masahiko Haruno,1
Tomoe Kuroda,1
Kenji Doya,1,2
Keisuke Toyama,3
Minoru Kimura,4
Kazuyuki Samejima,1,2
Hiroshi Imamizu,1 and
Mitsuo Kawato1
1Computational Neuroscience Laboratories, Advanced Telecommunications Research Institute, Kyoto 619-0288, Japan, 2Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Kyoto 619-0288, Japan, 3Shimadzu Technical Research Laboratory, Kyoto 619-0237, Japan, and 4Kyoto Prefectural University of Medicine, Kyoto 605-8566, Japan
Humans can acquire appropriate behaviors that maximize rewards on a trial-and-error basis. Recent electrophysiological and imaging studies have demonstrated that neural activity in the midbrain and ventral striatum encodes the error of reward prediction. However, it is yet to be examined whether the striatum is the main locus of reward-based behavioral learning. To address this, we conducted functional magnetic resonance imaging (fMRI) of a stochastic decision task involving monetary rewards, in which subjects had to learn behaviors involving different task difficulties that were controlled by probability. We performed a correlation analysis of fMRI data by using the explanatory variables derived from subject behaviors. We found that activity in the caudate nucleus was correlated with short-term reward and, furthermore, paralleled the magnitude of a subject's behavioral change during learning. In addition, we confirmed that this parallelism between learning and activity in the caudate nucleus is robustly maintained even when we vary task difficulty by controlling the probability. These findings suggest that the caudate nucleus is one of the main loci for reward-based behavioral learning.
Key words: basal ganglia; imaging; learning; motivation; reinforcement; reward
Received June 16, 2003;
revised December 22, 2003;
accepted December 23, 2003.
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