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Related Concept Videos

Wald-Wolfowitz Runs Test II01:17

Wald-Wolfowitz Runs Test II

The Wald-Wolfowitz runs test, commonly referred to as the runs test, is a nonparametric test used to assess the randomness of ordered data. The test evaluates the number of runs, which are consecutive sequences of similar elements within the data. If the number of runs is significantly higher or lower than expected, the data is considered non-random, indicating a detectable pattern or structure.
For binary data, runs are identified using symbols such as + and −, or equivalently, 1s and 0s. In...

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Insomnia-Driven Hippocampal Atrophy: Evidence From Bidirectional Mendelian Randomization.

Dandan Han1, Xiang Li2, Shaohua Zhao3

  • 1Medical Imaging Center, Xuchang Central Hospital Affiliated to Henan University of Science and Technology Xuchang P.R. China.

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|March 10, 2026
PubMed
Summary
This summary is machine-generated.

Genetically proxied insomnia causally reduces hippocampal volumes, suggesting early intervention may preserve brain health. Addressing insomnia is crucial for public health and cognitive well-being.

Keywords:
Mendelian randomizationbrain imaginggenome‐wide association studyhippocampal volumeinsomnia

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Area of Science:

  • Neuroscience
  • Genetics
  • Public Health

Background:

  • Observational studies suggest a link between insomnia and hippocampal atrophy.
  • Causal inference is limited by confounding and reverse causality.
  • Bidirectional causality between insomnia and hippocampal subfield volumes remains unaddressed.

Purpose of the Study:

  • To investigate the bidirectional causal relationship between insomnia and hippocampal volumes using Mendelian randomization.
  • To determine if genetic predisposition to insomnia affects hippocampal subfield volumes.
  • To assess if hippocampal volumes influence the risk of insomnia.

Main Methods:

  • Conducted a bidirectional two-sample Mendelian randomization (MR) study.
  • Utilized genome-wide association study (GWAS) summary data for insomnia and eight hippocampal volume imaging-derived phenotypes (IDPs).
  • Employed inverse-variance weighted regression and sensitivity analyses, controlling for multiple testing with Benjamini-Hochberg FDR.

Main Results:

  • Forward MR showed genetically proxied insomnia was inversely associated with six of eight hippocampal phenotypes, indicating reduced volumes.
  • Sensitivity analyses confirmed the robustness of these findings.
  • Reverse MR found no evidence that hippocampal volumes causally affect insomnia.

Conclusions:

  • Insomnia has a causal effect on reducing hippocampal volumes.
  • Early intervention for insomnia, such as cognitive-behavioral therapy, may help preserve hippocampal health.
  • Addressing insomnia is a public health priority, warranting further research into biological mechanisms and generalizability.