Reply #28: ADHD means the brain isn't getting working correctly.

[Lindacooks]

"Positron emission tomography scans of parents of ADHD children who also have symptoms of ADHD have shown decreased glucose metabolism in left frontal and parietal regions 8. These findings suggest the prefrontal cortex, which governs auditory attention, is less active among those with ADHD. Neurostimulants such as Ritalin are thought to increase the activity of these brain regions. Electroencephalographic studies of ADHD patients reveal abnormal reaction potentials in response to novel stimula after the subject has habituated to the test procedure 10.

Persons with ADHD have an unusually low rate of activity in brain areas responsible for motor control and attentiveness."

http://www.healing-arts.org/children/ADHD/

If you can see differences in the brain, then it's an actual condition. My dh has ADHD and before he was treated with drugs he couldn't concentrate, couldn't accomplish tasks easily, and couldn't focus (but could hyperfocus). He says that since taking drugs, everything is easier.