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Adaptive expression of engrams by retroactive interference.

Livia Autore1, James D O'Leary1, Clara Ortega-de San Luis1

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

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Summary
This summary is machine-generated.

New research shows that forgetting, specifically retroactive interference, modifies memory engrams. Stimulating these modified engram cells can restore memory, suggesting forgetting is an adaptive, reversible process.

Keywords:
CP: Neurosciencec-Fosconsolidationdentate gyrusengramfalse memoryforgettinginterferencememoryobject/context memory

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Memory Research

Background:

  • Long-term memories are encoded by neuronal ensembles called engrams.
  • Understanding how engrams are affected by forgetting is crucial but less explored than memory recall.
  • Retroactive interference is a common form of forgetting where new information impairs recall of older information.

Purpose of the Study:

  • To investigate the effects of retroactive interference on engram cell activity and memory retrieval.
  • To determine if forgotten memories stored in engrams can be reactivated or reinstated.
  • To explore the role of engram activity in the process of interference-based forgetting.

Main Methods:

  • Utilized an object memory behavioral paradigm to induce retroactive interference.
  • Employed activity-dependent cell labeling to identify and track engram cells.
  • Used optogenetic stimulation to test the retrieval capability of labeled engram cells.
  • Assessed the necessity of engram activity for interference to occur.

Main Results:

  • Retroactive interference reduced engram cell reactivation during memory recall.
  • Optogenetic stimulation of inhibited engram cells successfully retrieved the forgotten memory.
  • Presentation of related environmental information could reinstate forgotten engrams.
  • Engram activity was demonstrated to be essential for interference to manifest.

Conclusions:

  • Retroactive interference reversibly modulates engram expression, making it an updatable memory trace.
  • Forgotten engrams can be reactivated, indicating memory persistence despite apparent forgetting.
  • Interference-based forgetting may be an adaptive mechanism, allowing new information to update existing memories.