What would count as "conclusive" evidence for you? Recognize that we are dealing with mental phenomena. Most of the variations and illnesses that occur psychologically are relied on heavily by having the person exhibiting a phenomenon report it to third parties. There can be subsequent study, perhaps through the use of fMRI scans, to locate regions of the brain known to be associated with, say, the region determining sex or gender and the frequency with which such brain activity occurs in other persons communicating similar symptomology. You cannot expect to split the brain and find depression, ADHD, OCD, PTSD, etc. Are you prepared to take the radical position of someone like Thomas Szasz and claim there are no mental illnesses period?Where is the evidence? You all have arbitrary assumption and speculation. Nothing conclusive.
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