Publication Date:
2005-03-12
Description:
It is important for animals to estimate the value of rewards as accurately as possible. Because the number of potential reward values is very large, it is necessary that the brain's limited resources be allocated so as to discriminate better among more likely reward outcomes at the expense of less likely outcomes. We found that midbrain dopamine neurons rapidly adapted to the information provided by reward-predicting stimuli. Responses shifted relative to the expected reward value, and the gain adjusted to the variance of reward value. In this way, dopamine neurons maintained their reward sensitivity over a large range of reward values.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tobler, Philippe N -- Fiorillo, Christopher D -- Schultz, Wolfram -- 095495/Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2005 Mar 11;307(5715):1642-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anatomy, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK, and Institute of Physiology, University of Fribourg, CH-1700 Fribourg, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15761155" target="_blank"〉PubMed〈/a〉
Keywords:
*Adaptation, Physiological
;
Animals
;
Discrimination (Psychology)
;
Dopamine/*physiology
;
Electrophysiology
;
Female
;
Learning
;
Macaca fascicularis
;
Mesencephalon/cytology/*physiology
;
Neurons/*physiology
;
Photic Stimulation
;
Probability
;
*Reward
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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