Format

Send to

Choose Destination
Ann N Y Acad Sci. 2007 May;1104:135-46. Epub 2007 Mar 7.

Adding prediction risk to the theory of reward learning.

Author information

1
Computational and Neural Systems, California Institute of Technology, Pasadena, CA 91125, USA.

Abstract

This article analyzes the simple Rescorla-Wagner learning rule from the vantage point of least squares learning theory. In particular, it suggests how measures of risk, such as prediction risk, can be used to adjust the learning constant in reinforcement learning. It argues that prediction risk is most effectively incorporated by scaling the prediction errors. This way, the learning rate needs adjusting only when the covariance between optimal predictions and past (scaled) prediction errors changes. Evidence is discussed that suggests that the dopaminergic system in the (human and nonhuman) primate brain encodes prediction risk, and that prediction errors are indeed scaled with prediction risk (adaptive encoding).

PMID:
17344526
DOI:
10.1196/annals.1390.005
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Wiley
Loading ...
Support Center