Interesting. I wonder if it would be possible to detect someone with ADHD by their preferred dose.
Come to think of it, the original test could still work. If we know that caffeine affects people with ADHD differently, the fact that it's because they're taking a smaller dose is irrelevant. It does mean that you're not allowed to control dosage, so it would be more prone to error.
I've long had attention and focus problems, but never explored the possibility that I have ADHD till recently. I understand that it's a standard term, but I'm still a bit suspicious; Psychiatry doesn't seem like the most reliable field.
Are there good reasons for picking out the behaviors associated with ADHD and giving them a name? Obviously this is a different question than whether ADHD is a 'disorder' or 'disease', and whether ADHD medication is good or bad for people.
Answers that would satisfy me