The Successor Representation: Its Computational Logic and Neural Substrates

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
Samuel J Gershman

Abstract

Reinforcement learning is the process by which an agent learns to predict long-term future reward. We now understand a great deal about the brain's reinforcement learning algorithms, but we know considerably less about the representations of states and actions over which these algorithms operate. A useful starting point is asking what kinds of representations we would want the brain to have, given the constraints on its computational architecture. Following this logic leads to the idea of the successor representation, which encodes states of the environment in terms of their predictive relationships with other states. Recent behavioral and neural studies have provided evidence for the successor representation, and computational studies have explored ways to extend the original idea. This paper reviews progress on these fronts, organizing them within a broader framework for understanding how the brain negotiates tradeoffs between efficiency and flexibility for reinforcement learning.

Citations

Nov 23, 2018·Proceedings. Biological Sciences·Matthew P H GardnerSamuel J Gershman
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