Do surgery or a subspecialty thereof. Most of the time you will be forced to concentrate with the procedure at hand. That will help you to weed out any of the noises going on around you. Just like video games, doing laproscopic surgery (ie. working your fine motor skills like crazy) would be a great way to stimulate your attention, concentration, and focus. Psych, peds, path, and most of the other specialties listed above become extremely tedious and involves writing tons of long, drawn out notes. Best to do something that is extremely procedural based and allows you to focus on one task at a time. EM can be way too scattered and the multi-tasking involve can be challenging for a person who has problems maintaining concentration and focus.
Nardo,
Behavior/Developmental Pediatric Fellow