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Related Concept Videos

Attention-Deficit/Hyperactivity Disorder01:30

Attention-Deficit/Hyperactivity Disorder

294
Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings....
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Biological Influences on Intelligence01:30

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Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter...
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Related Experiment Video

Updated: Sep 14, 2025

Using Brain Activation nir-HEG/Q-EEG and Execution Measures CPTs in a ADHD Assessment Protocol
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ADHD and Differences in Brain Function as Measured by EEG: Cause or Effect?

Kwangmi Ahn1, Jenny Jean2, Luke J Norman2

  • 1National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA.

Journal of Attention Disorders
|July 18, 2025
PubMed
Summary
This summary is machine-generated.

Genetic variants linked to lower resting alpha brain waves may causally increase Attention-Deficit/Hyperactivity Disorder (ADHD) risk. This study used Mendelian randomization to establish a genetic link between electroencephalography (EEG) patterns and ADHD.

Keywords:
ADHDEEGMendelian randomizationalpha bandcausal inference

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Genetics

Background:

  • Observational studies suggest a link between Attention-Deficit/Hyperactivity Disorder (ADHD) and altered resting-state electroencephalography (EEG) oscillatory activity.
  • The causal nature of the association between EEG activity and ADHD remains unclear, necessitating genetic investigation.

Purpose of the Study:

  • To investigate the causal relationship between resting-state EEG activity and ADHD using genetic methods.
  • To determine if genetic predisposition for specific EEG patterns influences ADHD risk.

Main Methods:

  • A bidirectional two-sample Mendelian Randomization analysis was conducted.
  • Genome-wide association study summary statistics for EEG spectral power (n=7,983) and ADHD (n=225,534) were utilized.
  • Genetic variants were used as instrumental variables to infer causality between EEG activity and ADHD liability.

Main Results:

  • A significant unidirectional causal effect was found: genetic variants influencing resting alpha-band EEG activity conferred increased risk for ADHD (OR=0.89, p=1.52×10⁻³).
  • No evidence supported a reverse causal relationship, where ADHD liability influences alpha EEG power.
  • The findings indicate that genetic predisposition to altered alpha EEG activity may precede and contribute to ADHD development.

Conclusions:

  • This study provides genetic evidence for a causal link between reduced resting-state alpha power and ADHD.
  • Altered EEG activity may causally predispose individuals to ADHD, supporting observational findings and offering insights into ADHD pathophysiology.
  • The identified causal pathway has implications for understanding ADHD etiology and developing potential biomarkers.