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Frozen algorithms: how the brain's wiring facilitates learning.

Authors
  • Raman, Dhruva V1
  • O'Leary, Timothy2
  • 1 Department of Engineering, University of Cambridge, United Kingdom. , (United Kingdom)
  • 2 Department of Engineering, University of Cambridge, United Kingdom. Electronic address: [email protected] , (United Kingdom)
Type
Published Article
Journal
Current opinion in neurobiology
Publication Date
Apr 01, 2021
Volume
67
Pages
207–214
Identifiers
DOI: 10.1016/j.conb.2020.12.017
PMID: 33508698
Source
Medline
Language
English
License
Unknown

Abstract

Synapses and neural connectivity are plastic and shaped by experience. But to what extent does connectivity itself influence the ability of a neural circuit to learn? Insights from optimization theory and AI shed light on how learning can be implemented in neural circuits. Though abstract in their nature, learning algorithms provide a principled set of hypotheses on the necessary ingredients for learning in neural circuits. These include the kinds of signals and circuit motifs that enable learning from experience, as well as an appreciation of the constraints that make learning challenging in a biological setting. Remarkably, some simple connectivity patterns can boost the efficiency of relatively crude learning rules, showing how the brain can use anatomy to compensate for the biological constraints of known synaptic plasticity mechanisms. Modern connectomics provides rich data for exploring this principle, and may reveal how brain connectivity is constrained by the requirement to learn efficiently. Copyright © 2021 The Author(s). Published by Elsevier Ltd.. All rights reserved.

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