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Media type:
E-Article
Title:
Dopamine Ramps Are a Consequence of Reward Prediction Errors
Contributor:
Gershman, Samuel J.
Published:
MIT Press - Journals, 2014
Published in:
Neural Computation, 26 (2014) 3, Seite 467-471
Language:
English
DOI:
10.1162/neco_a_00559
ISSN:
1530-888X;
0899-7667
Origination:
Footnote:
Description:
Temporal difference learning models of dopamine assert that phasic levels of dopamine encode a reward prediction error. However, this hypothesis has been challenged by recent observations of gradually ramping stratal dopamine levels as a goal is approached. This note describes conditions under which temporal difference learning models predict dopamine ramping. The key idea is representational: a quadratic transformation of proximity to the goal implies approximately linear ramping, as observed experimentally.