http://www.corante.com/brainwaves/archives/015793.html Do you ever lose focus after working for several hours on a project? Are there times when you just can't seem to concentrate anymore? If you answered yes to these questions then you are probably normal. But what is normal?... en-us http://markc1.typepad.com/relentlesslyoptimistic/2004/11/adhd_neuroimagi.html ADHD - NeuroImaging Used to Understand $77B problem: Corante