Children with attention-deficit/hyperactivity disorder and comorbid oppositional defiant disorder: an EEG analysis

Area of Science:

• Neuroscience
• Child Psychology
• Clinical Electrophysiology

Background:

• Attention-deficit/hyperactivity disorder (ADHD) is a common neurodevelopmental disorder.
• Comorbid oppositional defiant disorder (ODD) frequently occurs with ADHD, complicating diagnosis and treatment.
• Electroencephalography (EEG) has shown potential as a biomarker for ADHD.

Purpose of the Study:

• To investigate electroencephalography (EEG) differences in children with ADHD, comparing those with and without comorbid ODD to a control group.
• To determine if comorbid ODD affects the EEG correlates of ADHD.
• To explore potential clinical applications of EEG in differentiating ADHD subtypes.

Main Methods:

• EEG data were collected from 20 males aged 8-12 years in three groups: ADHD, ADHD with comorbid ODD, and normal controls.
• EEG was recorded during an eyes-closed resting state using 21 monopolar derivations, clustered into nine regions.
• Fourier transformation was used to analyze absolute and relative power in delta, theta, alpha, and beta bands, along with theta/alpha and theta/beta ratios.

Main Results:

• Children with ADHD (both groups) exhibited higher absolute and relative theta power compared to controls.
• ADHD groups showed less relative alpha in posterior regions and less relative beta in frontal regions than controls.
• EEG differences between ADHD and controls persisted regardless of ODD comorbidity, with only minor topographic variations between ADHD groups.

Conclusions:

• EEG correlates of ADHD are discernible and not obscured by the presence of comorbid ODD.
• The findings support the potential use of EEG in clinical settings for assessing ADHD, even in the presence of ODD.
• Further research can refine EEG-based diagnostic and therapeutic strategies for pediatric ADHD.