You work in psychology. So please post evidence to back up your claims. Your degree and the fact you work in labs should make this easy.
Evidence of what? We can't go back 2000 years and give Ancient Egyptian's EEGs. breh. We can't sit a Kushyte down and tell them keep a diary of all their internal thoughts.
You are incorrect.
These disorders you mention are absolutely based in biology. They are, however, incredibly over-diagnosed.
Nope. People have biological dispositions but it is the their environment that brings it to fruition. It's their conscious thought that keeps it in place.


