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Articles, Behavioral/Systems/Cognitive

Influence of Reward Delays on Responses of Dopamine Neurons

Shunsuke Kobayashi and Wolfram Schultz
Journal of Neuroscience 30 July 2008, 28 (31) 7837-7846; https://doi.org/10.1523/JNEUROSCI.1600-08.2008
Shunsuke Kobayashi
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Wolfram Schultz
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Abstract

Psychological and microeconomic studies have shown that outcome values are discounted by imposed delays. The effect, called temporal discounting, is demonstrated typically by choice preferences for sooner smaller rewards over later larger rewards. However, it is unclear whether temporal discounting occurs during the decision process when differently delayed reward outcomes are compared or during predictions of reward delays by pavlovian conditioned stimuli without choice. To address this issue, we investigated the temporal discounting behavior in a choice situation and studied the effects of reward delay on the value signals of dopamine neurons. The choice behavior confirmed hyperbolic discounting of reward value by delays on the order of seconds. Reward delay reduced the responses of dopamine neurons to pavlovian conditioned stimuli according to a hyperbolic decay function similar to that observed in choice behavior. Moreover, the stimulus responses increased with larger reward magnitudes, suggesting that both delay and magnitude constituted viable components of dopamine value signals. In contrast, dopamine responses to the reward itself increased with longer delays, possibly reflecting temporal uncertainty and partial learning. These dopamine reward value signals might serve as useful inputs for brain mechanisms involved in economic choices between delayed rewards.

  • single-unit recording
  • dopamine
  • neuroeconomics
  • temporal discounting
  • preference reversal
  • impulsivity
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The Journal of Neuroscience: 28 (31)
Journal of Neuroscience
Vol. 28, Issue 31
30 Jul 2008
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Influence of Reward Delays on Responses of Dopamine Neurons
Shunsuke Kobayashi, Wolfram Schultz
Journal of Neuroscience 30 July 2008, 28 (31) 7837-7846; DOI: 10.1523/JNEUROSCI.1600-08.2008

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Influence of Reward Delays on Responses of Dopamine Neurons
Shunsuke Kobayashi, Wolfram Schultz
Journal of Neuroscience 30 July 2008, 28 (31) 7837-7846; DOI: 10.1523/JNEUROSCI.1600-08.2008
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