Self-Reported ADHD Symptoms and Interhemispheric Interaction in Adults: A Dimensional Approach

Area of Science:

• Neuroscience
• Psychology
• Cognitive Science

Background:

• Attention Deficit/Hyperactivity Disorder (ADHD) is increasingly recognized in adults.
• Understanding the neurobiological underpinnings of adult ADHD is crucial for effective interventions.
• Interhemispheric interaction plays a vital role in cognitive processing.

Purpose of the Study:

• To investigate the association between self-reported adult ADHD symptoms and the speed of interhemispheric interaction.
• To explore the influence of comorbid stress on this relationship.

Main Methods:

• Utilized a dimensional approach with a sample of 112 first-grade students.
• Administered Conners' Adult ADHD Rating Scales to assess ADHD symptomology.
• Employed letter matching reaction time tasks measuring within-hemisphere and across-hemisphere conditions to index interhemispheric interaction speed.
• Controlled for comorbid conditions like depression, anxiety, and stress.

Main Results:

• A weak but significant association was found between self-reported ADHD symptomology and faster interhemispheric interaction.
• Hyperactivity symptoms, particularly in the presence of stress, were most strongly linked to this faster interaction speed.
• Comorbid stress emerged as a significant modulating factor in the relationship between ADHD symptoms and brain communication.

Conclusions:

• Adult ADHD symptomology, especially hyperactivity, may be associated with altered interhemispheric communication dynamics.
• Stress exacerbates the relationship between ADHD traits and interhemispheric interaction speed.
• Findings support a dimensional view of ADHD and highlight the importance of considering comorbid factors in neurocognitive assessments.