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Input Convergence, Synaptic Plasticity and Functional Coupling Across Hippocampal-Prefrontal-Thalamic Circuits.

Lezio S Bueno-Junior1, Joao P Leite1

  • 1Department of Neuroscience and Behavioral Sciences, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil.

Frontiers in Neural Circuits
|June 8, 2018
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Summary

Executive functions rely on the prefrontal cortex (PFC), thalamus, and hippocampus. This review explores how these brain regions interact, influencing cognition and brain disorders through synaptic plasticity and circuit dynamics.

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anxietydecision makingelectrical brain stimulationfear conditioningfield potentialsoptogeneticsspatial navigationunit activity

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Systems Neuroscience

Background:

  • Executive functions and working memory are critically dependent on the prefrontal cortex (PFC).
  • The midline/paramidline thalamus (MLT) and the hippocampal formation (cornus ammonis 1/subiculum) are key PFC-projecting areas.
  • Electrophysiology studies in rodents are increasingly investigating the integrated function of these neural substrates.

Purpose of the Study:

  • To provide a method-oriented narrative of the current literature on PFC-thalamic and PFC-hippocampal circuits.
  • To elucidate circuit-level mechanisms underlying input convergence, synaptic plasticity, and functional coupling.
  • To offer insights into the neural basis of cognition and brain disorders.

Main Methods:

  • Review of rodent electrophysiology studies examining PFC, MLT, and HF interactions.
  • Analysis of mechanisms including input gating, synaptic plasticity, and modulation by interneurons and monoamines.
  • Examination of paired-pulse facilitation (PPF) and event-related potentials (ERP) dynamics.

Main Results:

  • Limbic thalamic and hippocampal inputs to the PFC gate each other and are modulated by PFC interneurons and monoaminergic projections.
  • Synaptic plasticity, PPF, and ERPs exhibit dynamic variations in PFC-related circuits during learning and under drug influence.
  • Thalamic-prefrontal loops are implicated in amplifying cognitive processes, limbic seizures, and prefrontal-hippocampal feedback for spatial navigation and decision-making.

Conclusions:

  • The interplay between the PFC, MLT, and HF is crucial for executive functions and working memory.
  • Understanding these circuits offers insights into cognitive mechanisms and neurological/psychiatric disorders.
  • Further research directions are proposed for thalamic-prefrontal and prefrontal-hippocampal circuit investigations.