I don't know a thing about this, but our local gifted group is hosting a talk on this topic tonight. The announcement says:

"Working Memory: The last decade has seen amazing progress in understanding the core cognitive deficit in ADHD. We will review what working memory is, and how inadequate working memory capacity is the primary source of impaired potential in people with ADHD. As we discuss the impact of inadequate working memory on higher level executive skills, we will move beyond the view of ADHD as a disorder of focus and impulsivity.

Then we will review groundbreaking research begun at the Karolinska Institute in Sweden, and independently validated at leading research institutions. This is the research that disproved the conventional wisdom that working memory could not be changed and that therefore ADHD could not truly be treated."