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Forgetting Enhances Episodic Control With Structured Memories. | LitMetric

Forgetting Enhances Episodic Control With Structured Memories.

Front Comput Neurosci

Department of Cell and Systems Biology, University of Toronto, Toronto, ON, Canada.

Published: March 2022

AI Article Synopsis

  • Forgetting is a natural part of brain function and may actually enhance decision-making, particularly regarding episodic memories, which tend to be forgotten over time.
  • Research using reinforcement learning indicates that agents can operate effectively by discarding older memories if they maintain important structural information about their environment.
  • The study found that selective forgetting can improve performance by reducing the impact of outdated experiences, thus supporting the idea that forgetting might serve a useful purpose beyond mere memory constraints.

Article Abstract

Forgetting is a normal process in healthy brains, and evidence suggests that the mammalian brain forgets more than is required based on limitations of mnemonic capacity. Episodic memories, in particular, are liable to be forgotten over time. Researchers have hypothesized that it may be beneficial for decision making to forget episodic memories over time. Reinforcement learning offers a normative framework in which to test such hypotheses. Here, we show that a reinforcement learning agent that uses an episodic memory cache to find rewards in maze environments can forget a large percentage of older memories without any performance impairments, if they utilize mnemonic representations that contain structural information about space. Moreover, we show that some forgetting can actually provide a benefit in performance compared to agents with unbounded memories. Our analyses of the agents show that forgetting reduces the influence of outdated information and states which are not frequently visited on the policies produced by the episodic control system. These results support the hypothesis that some degree of forgetting can be beneficial for decision making, which can help to explain why the brain forgets more than is required by capacity limitations.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8991683PMC
http://dx.doi.org/10.3389/fncom.2022.757244DOI Listing

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