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Enriched experience increases reciprocal synaptic connectivity and coding sparsity in higher-order cortex.

Rajat Saxena1,2, Justin L Shobe1, Aida M Andujo1

  • 1Department of Neurobiology and Behavior, University of California Irvine, Irvine, CA 92697, USA.

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Summary
This summary is machine-generated.

Enriched experience during sleep reshapes brain networks, forming stable knowledge representations. This study provides evidence for attractor network theories by showing enhanced bidirectional connections and improved neural coding efficiency.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Computational Neuroscience

Background:

  • Sleep is crucial for integrating new information and consolidating knowledge.
  • Auto-associative attractor network models predict reciprocal excitatory connections are key for stable categorical representations.
  • Direct experimental evidence for these network dynamics during knowledge accumulation is lacking.

Purpose of the Study:

  • To investigate how enriched experience and sleep impact cortical representations supporting categorical knowledge.
  • To provide direct evidence for the role of reciprocal excitatory connections in forming stable neural attractors.
  • To examine changes in neural circuit structure and activity patterns associated with knowledge accumulation.

Main Methods:

  • Utilized a ten-week enriched experience (ENR) paradigm in mice to model knowledge accumulation.
  • Recorded single-unit activity across the hippocampus and neocortex.
  • Analyzed changes in excitatory-excitatory and inhibitory-to-excitatory connections, and population activity during rest and sleep.

Main Results:

  • Enriched experience induced significant neural remodeling in high-level neocortex, not low-level neocortex.
  • Observed a shift from unidirectional to bidirectional excitatory-excitatory connections, suggesting the formation of 'cell assemblies'.
  • Noted increased inhibitory-to-excitatory connections, sparser, and more orthogonal population activity during rest and sleep, especially in deep cortical layers.

Conclusions:

  • Enriched experience reorganizes cortical circuits into a symmetric, inhibition-balanced network.
  • This network reorganization enhances neural coding efficiency, supporting knowledge consolidation.
  • Findings provide direct support for auto-associative attractor network theories of categorical knowledge representation.