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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Behavioral Neuroscience

Background:

  • Fearful memories persist lifelong, with the prelimbic (PL) cortex crucial for their retrieval.
  • Research has primarily investigated recent memory processes, leaving remote memory mechanisms less understood.

Purpose of the Study:

  • To investigate the dynamic neural mechanisms underlying remote fear memory retrieval in the PL cortex.
  • To characterize the temporal evolution of neuronal ensembles involved in fear memory recall over time.

Main Methods:

  • Utilized a novel knock-in mouse model with activity-dependent genetic labeling (TRAP2) for neuronal ensemble tracing.
  • Compared neuronal ensemble reactivation and behavioral contributions during learning, early, and late memory retrieval phases.

Main Results:

  • PL neuronal ensembles exhibit dynamic reorganization during remote fear memory retrieval.
  • Neurons activated during later memory retrievals showed greater reactivation and behavioral impact compared to those from learning or early retrieval.
  • PL activity during initial learning is essential for initiating this time-dependent ensemble reorganization.
  • Later-recruited PL neurons demonstrated stronger functional connectivity with cortical targets.

Conclusions:

  • The PL cortex undergoes a time-dependent reorganization of neuronal ensembles critical for remote fear memory.
  • This dynamic process, initiated by learning, refines neural circuits for sustained fear memory retrieval.
  • Functional connectivity patterns of PL ensembles evolve, enhancing cortical target engagement for remote memories.