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Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
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Engram cell connectivity as a mechanism for information encoding and memory function.

Clara Ortega-de San Luis1, Maurizio Pezzoli2, Esteban Urrieta1

  • 1School of Biochemistry and Immunology, Trinity College of Dublin, Dublin D02 PN40, Ireland; Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin D02 PN40, Ireland.

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Learning shapes memory by altering synaptic connections between engram cells. This study reveals how specific wiring patterns and postsynaptic density protein 95 (PSD-95) contribute to memory stability.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cognitive Science

Background:

  • Memory formation involves changes in brain cell ensembles called engram cells.
  • The precise mechanism by which engram cells store specific information remains largely unknown.

Purpose of the Study:

  • To investigate if synaptic wiring patterns between engram cells underlie information storage.
  • To explore the role of postsynaptic density protein 95 (PSD-95) in memory consolidation.

Main Methods:

  • Monitored changes in engram cell connectivity in the hippocampal ventral CA1 (vCA1) and amygdala during learning.
  • Manipulated presynaptic and postsynaptic components of these connections to assess functional significance.
  • Investigated the role of PSD-95 in synaptic plasticity and memory stability.

Main Results:

  • Learning induced specific modifications in the synaptic connectivity between engram cells.
  • Artificial activation/inhibition of synaptic components demonstrated their role in memory recall.
  • Identified PSD-95 as a key mediator of synaptic plasticity impacting engram cell connectivity and long-term memory.

Conclusions:

  • Specific synaptic wiring between engram cells is a substrate for information storage.
  • PSD-95-mediated synaptic plasticity contributes to the long-term stability of memories.
  • Findings advance understanding of how information is encoded and maintained in neural circuits.