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Related Experiment Video

Updated: Aug 6, 2025

Assessment of Stress Effects on Cognitive Flexibility using an Operant Strategy Shifting Paradigm

Assessment of Stress Effects on Cognitive Flexibility using an Operant Strategy Shifting Paradigm

Published on: May 4, 2020

Serotonin in the orbitofrontal cortex enhances cognitive flexibility.

Jung Ho Hyun^1,2,3, Patrick Hannan^1,2, Hideki Iwamoto⁴

¹Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

Biorxiv : the Preprint Server for Biology

|March 22, 2023

Summary

This summary is machine-generated.

Serotonin release from the dorsal raphe nuclei to the orbitofrontal cortex promotes cognitive flexibility by enhancing neuronal excitability and synaptic plasticity during reversal learning tasks.

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Area of Science:

Neuroscience
Cognitive Neuroscience
Cellular Neuroscience

Background:

Cognitive flexibility, the ability to adapt behavior to changing contexts, lacks cellular-level understanding.
The role of the dorsal raphe nuclei (DRN) to orbitofrontal cortex (OFC) serotonergic pathway in cognitive flexibility is unexplored.

Approach:

Investigated the DRN-OFC serotonergic pathway during a reversal learning task in animal models.
Utilized anatomical and functional methods to confirm the long-range connection.
Examined the effects of serotonergic action on OFC neuronal excitability, network activity, and synaptic plasticity.

Key Points:

Serotonin release from the DRN to the OFC significantly promotes reversal learning.
Serotonergic action enhances OFC neuronal excitability and network spike probability.
Facilitated synaptic plasticity induction in the OFC by increasing dendritic spine Ca2+ influx.

Conclusions:

The DRN-OFC serotonergic pathway is crucial for cognitive flexibility.
Serotonin-dependent synaptic plasticity in the OFC underlies the formation of choice-specific neuronal ensembles.
This study elucidates the cellular mechanisms driving cognitive flexibility.