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Parallel neuronal structural plasticity with memory trace formation in the orbitofrontal cortex.

Sophie T Yount1,2,3,4, Dan C Li2,3,4,5, Kathryn M Stachowicz2,3,4

  • 1Graduate Program in Molecular and Systems Pharmacology, Emory University, Atlanta, GA, USA.

Nature Communications
|September 26, 2025
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Summary
This summary is machine-generated.

Flexible decision-making relies on the orbitofrontal cortex (OFC) for memory retrieval. Specific OFC neurons form memory traces (MTs) essential for action flexibility and learning new strategies.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Behavioral Biology

Background:

  • Flexible decision-making is crucial for daily life.
  • This process involves forming expectations and recalling memories to guide actions.

Purpose of the Study:

  • To investigate the role of orbitofrontal cortex (OFC) neurons in memory formation and retrieval for flexible decision-making.
  • To understand the cellular mechanisms underlying memory storage and action flexibility.

Main Methods:

  • Mice were trained on a task requiring them to develop, remember, and recall strategies for rewards.
  • Chemogenetics was used to inactivate or stimulate OFC neurons during memory encoding.
  • Dendritic spine morphology was analyzed in OFC neurons.
  • The basolateral amygdala's role was examined using chemogenetics and neurotrophin signaling assessment.

Main Results:

  • Inactivating OFC neurons active during memory encoding impaired subsequent memory retrieval and action flexibility.
  • Stimulating these OFC neurons enhanced action flexibility.
  • OFC neurons forming memory traces (MTs) showed a higher proportion of mature dendritic spines, linked to learning.
  • Amygdala activity and neurotrophin signaling were vital for memory formation and dendritic spine plasticity in OFC MT neurons.

Conclusions:

  • OFC neurons form stable memory traces (MTs) that are necessary and sufficient for action flexibility.
  • Structural plasticity in OFC neurons, influenced by amygdalo-OFC interactions, underpins the retention and utilization of new reward information for choice behavior.