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These psychopathests have reduction in the volume. and, also, when they contemplate making moral decisions like, shall i kill someone or not? that part of the brain is not as active as in normal people. >> you've done a terrific job of making the science accessible for people. i want to show a couple images that are important here and people should see these, again. you should read the book. take a look there, a scan of the brain, normal on the left and a murderer on the right. what are we looking at there? >> well, we're looking down on the brain. this is a pet scan, so, it's looking at brain...

Impairment, a volume deduction and poor functioning in a part of the brain called the amygdala, the seat of emotion. we have been finding on psychopathic offenders they have an 18% reduction in the volume in the amygdala. when they contemplate making moral decisions like should i kill someone or not, that part of the brain is just not as active as in normal people. >> you have done a terrific job making the science accessible for people. i want to show a couple of images that will be important. you should read the book. take a look there at a scan of the brain, a p.e.t. scan. normal on the lef...

The other day saying i want a pet scan of my entire body so i know i don't have cancer. that may sound great. do you have any idea what that costs? thousands of dollars. if patients don't pay for it, they don't care. bill: going to all the cost here now. what are we going to do about that? what happens? >> well i think that if we don't do it this way we're going to be faced with more and more regulations, more and more bureaucracy and less choices for either the physician or the patient. less choices mean unhappy doctors and unhappy patients. we have got to amend this law and get it to include...

Mris and pet scans and spinal fluid they can differentiate in a large percentage of the cases between alzheimer's and front temporal dementia. only the mri may be enough. that is exciting. if we can use the latest type of mri to tell us different types of dementia we will know which to target with the new treatment. >> you mentioned a pet scan. what is that? >> that looks at heat. how much radiation or how much heat something gives off. is very expensive and to take someone who is debilitated and having problems with dementia and start giving them spinal taps and putting them in pet scanners w...

Discriminated against. geneticists and ethicists are concerned about this type of process but on the other hand the research is moving forward and we're trying to establish whether or not there are some correlations which might help to be predictive in the future. heather: finally, once you establish those correlations, what is ultimately the benefit or the goal? >> correct. i think the goal is to help us do what we do with other conditions, which are, medically related or genetically related. we try to help the individuals with either medications. find out whether or not in these cases closer...