30 Essential Ideas you should know about ADHD, 4A The 5 Brain Regions that causes ADHD

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ADHD and Causation
Barkley explains the percent of ADHD that is genetic, and the percent that is environmental.

The Five Regions of the brain that are smaller with people that have the genetic cause of ADHD
Right Frontal Lobe (Orbital Prefrontal Cortex)
Basal Ganglia (Mainly Striatum and Globus Pallidum)
Cerebellum (central vermis area, more on right side)
Anterior Cingulate Cortex
Corpus Callosum (Primary Anterior Splenium)

ADHD children also have a 2 to 3 year delay in the growth and the size of these parts of the brain. Eventually as adults the size will for the most part equalize and only be 3 to 8% smaller.

Even though these parts of the brain are barely smaller, it is the electrical activity and how the brain that is wired that really cause the ADHD. Not the size of the parts but how those parts are wired and do they generate enough electrical activity to adequaltely use those parts of the brain in daily life.

Current medical imaging can't diagnose individuals for the size difference is too close and too subtle to normal. Yet look at hundreds or thousands of scans and patterns emerge.

The importance of twin studies and what twin studies tell us about causation.

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