This is an interesting article, and makes me wonder how much that is attributed to ADHD is actually simply normal brain activity of the DMN doing its ruminative looping, and whether ADHD is really just a rampant runaway Default Mode Network (DMN), and is the answer to all this to practice Attention attention attention, body and mind in this moment functioning in harmony……
https://news.yahoo.com/lifestyle/6-habits-may-secretly-sign-181602996.html