tavis: so the source of the alcoholism, the depression, the anorexia -- same source, or multiple factorsl this on? >> that's the million-dollar question, it really is. i think it's genetic, to some degree. i think it's situational to some degree. i think if one has an additive nature, i'm not sure where that comes from. that could be genetic as well. but it's just something i got, you know? the depression is a lot of it, and i think that's genetic, genetic and biological. so running from that takes a lot of forms. tavis: how do you not run from it but ward against it in the future? >> oh, well, that takes some learning, and i was quite young when i started showing symptoms of it, and we didn't know what to call it. it was early mid-'60s and lived in a small town, provincial, and nobody knew what was wrong. so it took a while to get the proper kind of help, which was meds, and that's how you ward -- well, there are other ways. medicine is very, very helpful. tavis: is one way, yeah, yeah. >> well, for some of us it's the main way. for me it is, anyway. sleep, exercise, reducing stress, th

we've got eating disorders like anorexia. then there are disorders of childhood, whether it's autism or attention deficit those fit into the spectrum of what we call mental disorders and the key message is that these are brain disorders, just as eric said. they're a little bit different, though, than the way gerry's been talking about them because these are disorders that don't have a focal legion. when you look at the brain here you don't find an area of dead cells. >> rose: you can't do an autopsy and find... >> there's nothing there. people have looked for years but in each one of these cases what you find is there's nothing there on autopsy. yet when you use brain scans the way we can now, as eric mentioned, we've got this enormous powerhouse of tools to be able to look at the brain and how it functions in health and disease and we can see that there are circuits that aren't functioning right. so each of these disorders involves some part of the circuitry that's either hyperactive or inactive or the communications. we don