How Does ADHD Affect the Default Mode Network (DMN)? 

In ADHD default mode network studies, neuroimaging, especially resting‑state fMRI, reveals that the DMN shows connectivity patterns that differ significantly from those in people without ADHD. These alterations often involve weaker suppression of the DMN during tasks, greater internal mind‑wandering, and reduced coordination with other brain networks responsible for attention and executive control.  

Researchers have found that in ADHD, there’s decreased connectivity between core DMN hubs (such as the posterior cingulate cortex and precuneus) and regions like the dorsal anterior cingulate cortex, which partakes in controlling attention. Also, some studies show more dispersed or less stable DMN connectivity at rest, implying that the way the ADHD brain shifts between internal and external focus is not as efficient.  

These findings help explain features like distractibility, task lapses, and difficulties with shifting attention. 

Common Symptoms Linked to DMN Changes 

Understanding how the DMN is altered helps connect imaging findings to everyday experience and treatment: 

Mind‑wandering and Distractibility 

People with ADHD may frequently drift into internal thoughts or daydreaming, especially when they need to focus. Medication (e.g. stimulants) can improve the ability to suppress DMN activity during challenging tasks, and CBT helps develop strategies for shifting attention back to relevant external cues. 

Difficulty Starting or Sustaining Tasks 

When DMN remains active during tasks, transitioning into goal‑oriented behaviour can be slow or inconsistent. Behavioural therapy and structured routines can help, and medication may assist by enhancing connectivity between the DMN and task‑positive networks. 

Visit providers like ADHD Certify for personal consultations tailored to your ADHD care and support needs. 

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to ADHD default mode network.