Why Higher Working Memory Capacity May Help You Learn: Sampling, Search, and Degrees of Approximation

Kevin Lloyd*, Adam Sanborn, David Leslie, Stephan Lewandowsky

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

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Abstract

Algorithms for approximate Bayesian inference, such as those based on sampling (i.e., Monte Carlo methods), provide a natural source of models of how people may deal with uncertainty with limited cognitive resources. Here, we consider the idea that individual differences in working memory capacity (WMC) may be usefully modeled in terms of the number of samples, or “particles,” available to perform inference. To test this idea, we focus on two recent experiments that report positive associations between WMC and two distinct aspects of categorization performance: the ability to learn novel categories, and the ability to switch between different categorization strategies (“knowledge restructuring”). In favor of the idea of modeling WMC as a number of particles, we show that a single model can reproduce both experimental results by varying the number of particles—increasing the number of particles leads to both faster category learning and improved strategy-switching. Furthermore, when we fit the model to individual participants, we found a positive association between WMC and best-fit number of particles for strategy switching. However, no association between WMC and best-fit number of particles was found for category learning. These results are discussed in the context of the general challenge of disentangling the contributions of different potential sources of behavioral variability.

Original languageEnglish
Article numbere12805
Number of pages43
JournalCognitive Science
Volume43
Issue number12
DOIs
Publication statusPublished - 15 Dec 2019

Structured keywords

  • Memory
  • Cognitive Science

Keywords

  • Approximate Bayesian inference
  • Category learning
  • Knowledge partitioning
  • Particle filtering
  • Strategy switching
  • Working memory

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