Dumit, Joseph, Picturing Personhood: Brain Scans and Biomedical Identity

Extreme images
If you want to emphasize the differences you show the extreme cases, although every responsible article gives information also for the overlapping areas.
In the last pages of the chapter, an example of an experiment is described, comparing schizophrenic to normal brain images.
We can clearly see the complexion of analysing the given data, the danger of our misguidance and misinformation due to our lack of knowledge and experience on reading those images.

http://www.scienceclarified.com/Ro-Sp/Schizophrenia.html