Hello,
As a neuroscientist & psychology professor I am compelled to weigh in on this fascinating subject. I wrote a longer response, but this system seems to have a tendency to log people out if we get carried away in our writing so I'll keep this one short.
I feel like although most of the critical concepts were raised and discussed in tonight's show (5/15/08, WCMU Mount Pleasant) one of the aspects that seemed far too implicit or rather un-emphasized was the fact that our brains are so very malleable. When we change our brain activity so constantly, it is difficult to know what activity is ever telling of any bigger picture issue. Responsibility is hidden in that. This can be seen in a simple example of a person who develops a habit of suppressing the little inner voice that says "you shouldn't do that, cause that's wrong." Eventually, the voice shuts down and so might the tendency to suppress taboo behaviors. However such a person would be, in the greater scheme, entirely responsible for their actions.
On many occasions our brains are changed due to practice. Telling the difference between practiced change and change due to disrupted development, trauma, or disease, would challenge even the most savvy fMRI or SPECT reader. I wonder, however, whether we might use brain scanning technology to help those who may actually want to improve themselves do so more effectively, as was suggested on the program.
Michael