Adding prediction risk to the theory of reward learning
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). © 2007 New York Academy of Sciences.
Keywords: dopamine ; animal ; brain ; brain mapping ; conditioned reflex ; histology ; human ; learning ; metabolism ; nerve cell ; physiology ; probability ; regression analysis ; reinforcement ; review ; reward ; risk ; Animals ; Association Learning ; Brain ; Brain Mapping ; Conditioning ; Classical ; Dopamine ; Humans ; Learning ; Least-Squares Analysis ; Neurons ; Probability ; Reinforcement (Psychology) ; Reward ; Risk
TY - SER
Export Date: 4 December 2007
Record created on 2007-12-17, modified on 2016-08-08