Abstract
Objective: to verify trajectories of inattention, hyperactivity and impulsivity symptoms along a treatment for Attention Deficit Hyperactivity Disorder (ADHD). Method: one trial randomized controlled trial evaluating the effects of methylphenidate (n = 50) treatment on (n = 50) and placebo (n = 50) on ADHD symptoms at preschool age are currently being conducted. It will be used the modeli…