“…Functional magnetic resonance imaging work shows that multiple brain loci are involved in the mediation of attention problems (Ernst et al, 1999;Posner & Raichle, 1998;Zametkin et al, 1990) and pharmacological studies show that no one model of brain chemistry accounts for all of the cases or range of symptoms (Vaidya et al, 1998). Indeed, there is lack of agreement among theorists concerning exactly what "attention deficit" means (Barkley, Grodzinsky, & DuPaul, 1998;Mirsky, 1987;Williams & Boll, 1997;Lee, 1991). Thus, any one treatment method cannot be expected to serve all whether it is pharmacological, electrophysiological, or behavioral.…”