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Increased hippocampal-prefrontal functional connectivity in insomnia.

Jeanne Leerssen1, Rick Wassing1, Jennifer R Ramautar1

  • 1Department of Sleep and Cognition, Netherlands Institute for Neuroscience, Meibergdreef 47, 1105 BA Amsterdam, The Netherlands.

Neurobiology of Learning and Memory
|February 16, 2018
PubMed
Summary

Insomnia disorder is linked to stronger brain connectivity between the hippocampus and the left middle frontal gyrus. This increased functional connectivity correlates with greater insomnia severity and poorer sleep quality.

Keywords:
Functional connectivityHippocampusInsomniaMiddle frontal gyrusResting-state fMRISleep

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Sleep Medicine

Background:

  • Insomnia Disorder (ID) is a prevalent mental health condition impacting daily functioning.
  • Declarative memory, reliant on the hippocampus, is notably affected in insomnia.
  • Previous research on hippocampal structure and function in insomnia has yielded inconsistent results.

Purpose of the Study:

  • To investigate hippocampal volume and functional connectivity in individuals with Insomnia Disorder using advanced neuroimaging techniques.
  • To compare brain structure and resting-state functional connectivity in the hippocampus between ID patients and healthy controls.
  • To explore the relationship between hippocampal functional connectivity, insomnia severity, and subjective sleep quality.

Main Methods:

  • Structural and resting-state functional Magnetic Resonance Imaging (MRI) was employed.
  • Participants included 65 individuals with Insomnia Disorder and 65 healthy controls.
  • Insomnia severity, subjective sleep, and objective sleep were assessed using validated questionnaires and polysomnography.

Main Results:

  • No significant differences in hippocampal volume were found between ID patients and controls.
  • A significantly stronger functional connectivity between the bilateral hippocampus and the left middle frontal gyrus was observed in ID patients.
  • This enhanced connectivity positively correlated with insomnia severity and negatively with subjective sleep efficiency.

Conclusions:

  • The study highlights altered hippocampal functional connectivity, not volume, in Insomnia Disorder.
  • Stronger connectivity between the hippocampus and the left middle frontal gyrus is associated with more severe insomnia and poorer sleep.
  • These findings suggest a neural mechanism involving rumination circuits in the pathophysiology of insomnia.