On the Validity of Brain Scans as Proofs of Psychiatric Theories by Dean Blehert. Dean is one of my favorite poets/writers and his take on psychiatry is similar to my own. (It’s a bunch of bogus pseudoscience). He’s found an article by Dr. Grace Jackson, a psychiatrist and an expert on brain imaging, and who refutes the validity of the attempts by various psychs to defend the “science” of their diagnoses by using comparative brain scans. Dean puts into layman’s terms some complex science, and does it well. Find out all about Functional Brain Scans vs. Anatomical Brain Scans. Anatomical scans have been around for 50 some years and show tumors and the like. Functional brain scans are all experimental and theoretical and there are too many variables involved in one to prove anything with them.