Venus I totally agree. Still to this day with all our medical advances and technology we do not know anything about the brain. We know chemicals, either secreted by our own bodies or external chemicals, affect brain function in good and bad ways. But we do not know the extent of damage due to different chemicals. No 2 ppl are the same and no 2 brains are made up the same way. We have known average levels but nothing exact.

To give exact information regarding the brain would be irresponsible in any medical or scientific profession.