I am not an expert on Neuropsychiatric disorders so my opinion is based on that fact.
The diagnosis of ADHD and the prescribing of Ritalin has doubled over the past 15yrs and this does need some sort of explanation.
In fact, the essential first step in all diagnosis, even in the diagnosis of psychiatric disorders, is to make the fundamental “Is it a disease or isn’t it?
The absence of organic disease, over time, stands as the strongest evidence that a patient’s symptoms are psychogenic.
So, what is the medical evidence of an abnormality?
MRI scans have been taken of the brain along with biochemical studies and neurophysiological investigations.
Jake-the peg gave an excellent link to a study which, in my opinion, highlighted all the dangers and misinterpretations of medical studies. Firstly, the study was biased, as the group investigated had already been "labelled" as suffering from ADHD purely on clinical grounds without evidence of any abnormality.
Secondly, there was a Dopamine imbalance in a certain percentage in the trial, but it is wrong to assume, that this imbalance has anything to do with the symptoms and evidence for ADHD.
Also there has been demonstrated that other brain abnormalities are seen on MRI scanning, but there is nothing to counteract the claim that these are indeed due to Ritalin.
For me.....the jury is still out........I am not convinced of the existence of ADHD.