Dear Uni Girl,
Well, then they medicate you based on experience. If you have an underactive prefrontal cortex, then you may need ADD meds. If you have an underactive prefrontal cortex, but a limbic system which is on fire, you may just be depressed. If you have an overactive cingulate gyrus, then you probably have OCD and need an SSRI. And if your temporal and parietal lobes are getting too much or too little blood....your DPed. Or you have huge anger problems. I went to the Amen Clinic, and those were the lobes where there were problems. They immediately got me started on an anticonvulsant, and its totally worth it. Go out there if you can. Its worth 3000 dollars to get a life again. There is another guy who runs a website called Crazy Meds who was also at the clinic. Just google his website. He has excellent information about meds as well.....the best on the net, I believe. Its second only to a PDR.