Adolescents with ADHD who are treated with one of the methylphenidate medication that is in use in Israel(Ritalin,Ritalin SR,Concerta,Ritalin LA)will be tested by driving simulator and seat pressure mapping by 2 stages: 1.when they are taking the medication that they are taking every day to control ADHD and: 2. without medication ( after 4 day washout period).