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Juan Facundo Morici1, Noelia Victoria Weisstaub1, Camila Lidia Zold2

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The hippocampus (HPC) and medial prefrontal cortex (mPFC) coordinate during memory recall. Increased synchronization between these brain regions and specific mPFC neuronal activity predict memory performance.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Systems Neuroscience

Background:

  • Episodic memory recall involves complex interactions between multiple brain regions.
  • The hippocampus (HPC) is thought to trigger memory recall via medial prefrontal cortex (mPFC) activation, but mechanisms are unclear.
  • Coordinated activity between the HPC and mPFC during memory retrieval is not well understood.

Purpose of the Study:

  • To investigate the neural mechanisms underlying memory recall, focusing on the interaction between the ventral hippocampus (vHPC) and mPFC.
  • To explore how coordinated brain activity and neuronal ensembles in the mPFC contribute to object-in-context (OIC) memory retrieval.

Main Methods:

  • Electrophysiological recordings were performed in behaving rats during the OIC memory task.
  • Analysis included local field potential (LFP) synchronization (coherence, phase locking, theta amplitude correlation) between vHPC and mPFC.
  • Neuronal ensembles in the mPFC encoding object-context associations were identified.

Main Results:

  • An increase in vHPC-mPFC LFP synchronization in the theta range was observed when rats explored contextually mismatched objects.
  • Specific neuronal ensembles in the mPFC were found to encode object-context associations.
  • Increased vHPC-mPFC synchronization and mPFC neuronal activity predicting incongruent object recognition correlated with task performance.

Conclusions:

  • Changes in vHPC-mPFC synchronization are implicated in the recall of past events.
  • mPFC neuronal ensembles encoding specific object-context associations play a role in memory retrieval.
  • These findings elucidate the coordinated neural dynamics supporting memory recall.