A new study revealed this week that kids with attention deficit hyperactivity disorder may see a slowing of growth when it comes to crucial parts of brain development.

Compared to kids not diagnosed with ADHD, the study flew in the face of earlier research that used brain imaging to draw a smaller line between brain development of kids with and without ADHD.

In this study, the lag with ADHD kids insofar as brain development was as much as three years. Meaning, the ability to suppress inappropriate actions and thoughts, focus attention, remember things from moment to moment, work for reward and control movement was oft delayed in ADHD kids.

To me, this study says that slower brain development is actually the cause of ADHD, not an effect. What do you believe?