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Inhibitory engrams in perception and memory.

Helen C Barron1,2, Tim P Vogels3, Timothy E Behrens1,4

  • 1The Oxford Centre for Functional Magnetic Resonance Imaging of the Brain, University of Oxford, Oxford OX3 9DU, United Kingdom; helen.barron@merton.ox.ac.uk tim.vogels@cncb.ox.ac.uk behrens@fmrib.ox.ac.uk mani.ramaswami@tcd.ie.

Proceedings of the National Academy of Sciences of the United States of America
|June 15, 2017
PubMed
Summary
This summary is machine-generated.

The brain uses inhibitory engrams, or neural replicas, to control memory and behavior. These inhibitory circuits help habituate responses and keep memories latent for context-specific recall.

Keywords:
computational modelinhibitory plasticitymemorynegative imageneural representation

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Systems Neuroscience

Background:

  • Nervous systems utilize excitatory cell assemblies for sensory perception and memory engrams for past experiences.
  • Emerging evidence suggests the brain employs inhibitory replicas of excitatory representations for cognitive functions.

Purpose of the Study:

  • To explore the formation and function of inhibitory engrams in the brain.
  • To understand how inhibitory engrams regulate behavior and memory expression.

Main Methods:

  • Investigating homeostatic potentiation of inhibition onto postsynaptic cells with increased excitation.
  • Analyzing the role of inhibitory engrams in behavioral habituation and memory latency.
  • Examining neural network dynamics with balanced excitatory and inhibitory engrams.

Main Results:

  • Inhibitory engrams reduce behavioral responses to familiar stimuli, leading to habituation.
  • They maintain memories in a quiescent, latent state, enabling context-relevant activation.
  • Balanced excitatory and inhibitory engrams facilitate innate responses and memory recall via disinhibition.

Conclusions:

  • Understanding inhibitory engram mechanisms is crucial for explaining cognition.
  • These mechanisms offer insights into psychiatric conditions like autism, schizophrenia, and PTSD.