I just started reading Daniel Amen’s new book called “Healing ADD.” He also has a web site called brainplace.com.
The book identifies 6 distinct types of ADD. Dr. Amen has pioneered in brain imaging techniques. He has shown that there are objective brain differences in people with these 6 different types of ADD.
He thinks each type needs to be addressed differently. I’m only at the beginning of the book but it’s quite interesting so far.