Cited by 446Reinforcement Learning in RoboticsMemory and Neural MechanismsNeural and Behavioral Psychology Studies

Reinforcement learning and episodic memory in humans and animals: an integrative framework

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Gershman, Samuel J., Daw, Nathaniel D.·2017·Annual Review of Psychology

Abstract

We review the psychology and neuroscience of reinforcement learning (RL), which has experienced significant progress in the past two decades, enabled by the comprehensive experimental study of simple learning and decision-making tasks. However, one challenge in the study of RL is computational: The simplicity of these tasks ignores important aspects of reinforcement learning in the real world: (a) State spaces are high-dimensional, continuous, and partially observable; this implies that (b) data are relatively sparse and, indeed, precisely the same situation may never be encountered twice; furthermore, (c) rewards depend on the long-term consequences of actions in ways that violate the classical assumptions that make RL tractable. A seemingly distinct challenge is that, cognitively, theories of RL have largely involved procedural and semantic memory, the way in which knowledge about action values or world models extracted gradually from many experiences can drive choice. This focus on semantic memory leaves out many aspects of memory, such as episodic memory, related to the traces of individual events. We suggest that these two challenges are related. The computational challenge can be dealt with, in part, by endowing RL systems with episodic memory, allowing them to (a) efficiently approximate value functions over complex state spaces, (b) learn with very little data, and (c) bridge long-term dependencies between actions and rewards. We review the computational theory underlying this proposal and the empirical evidence to support it. Our proposal suggests that the ubiquitous and diverse roles of memory in RL may function as part of an integrated learning system.

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  1. Bellman R 1957 Dynamic Programming Princeton University Press
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Authors
Gershman, S. J., & Daw, N. D.
Affiliations
  • Harvard University (US)
  • Princeton University (US)
Venue
Annual Review of Psychology
Published
2017-01-03
Volume
68
Issue
1
Pages
101-128
ISSN
  • 0066-4308 (ISSN-L)
  • 1545-2085
OpenAlex
W2346736747
Cited by
446
References
133
Citations by year
2026: 18 · 2025: 63 · 2024: 53 · 2023: 53 · 2022: 58 · 2021: 51 · 2020: 45 · 2019: 35 · 2018: 38 · 2017: 30 · 2016: 1 · 2015: 1
FWCI
5.51
Type
journal article
Language
en
Open access
Locations
  • Annual Review of Psychology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute on Drug Abuse (R01DA038891)
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Reinforcement Learning in Robotics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
Keywords
reinforcement learning, episodic memory, semantic memory, procedural memory, value function approximation, instance-based learning, decision-making
MeSH terms
Animals, Brain, Decision Making, Humans, Learning, Reinforcement, Psychology, Reward, Memory, Episodic

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