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Memory Retention Involves the Ventrolateral Orbitofrontal Cortex: Comparison with the Basolateral Amygdala.

Kelsey S Zimmermann1,2,3,4, Chen-Chen Li2,3, Donald G Rainnie2,3,4

  • 1Department of Pediatrics, Emory University, Atlanta, GA, USA.

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
|July 1, 2017
PubMed
Summary
This summary is machine-generated.

The ventrolateral orbitofrontal cortex (VLO) is crucial for retaining learned associations. Inhibiting the VLO disrupts memory for both fear extinction and reward-based actions, impacting flexible behavior.

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Area of Science:

  • Neuroscience
  • Behavioral Science

Background:

  • The orbitofrontal cortex (OFC) links stimuli, actions, and outcomes for flexible behavior.
  • Mechanisms by which the OFC retains these associations for future guidance are unclear.

Purpose of the Study:

  • Investigate the role of the ventrolateral OFC (VLO) in memory retention for appetitive and aversive conditioning.
  • Determine if VLO neuroplasticity is essential for maintaining learned associations.

Main Methods:

  • Used CaMKII-driven inhibitory designer receptors exclusively activated by designer drugs (DREADDs) to inactivate the VLO in mice.
  • Administered Clozapine-N-oxide (CNO) to activate DREADDs during fear extinction and response-outcome conditioning.
  • Compared VLO inactivation effects with those in the basolateral amygdala (BLA) and dorsolateral striatum.

Main Results:

  • VLO inactivation during fear extinction impaired memory, leading to sustained freezing.
  • VLO inactivation during response-outcome conditioning caused goal-directed responding to decay.
  • Inactivation of BLA impaired conditioning acquisition, while dorsolateral striatum inhibition enhanced response-outcome conditioning.

Conclusions:

  • Learning-related neuroplasticity in the VLO is necessary for memory retention in both appetitive and aversive domains.
  • The VLO plays a critical role in maintaining learned associations that guide flexible behavior.