First of all A2-73 is in Human Trials for
Alzheimer's not Parkinson's . Second A placebo effect is going to be different for different populations regardless of the disease, hence why you have different placebo groups for the same disease.
However, after a certain number of studies The Placebo Effect becomes predictable for many diseases based on N= 100,000 plus placebo patients..
Since all people are taking same drug with same disease the Placebo EFFECT becomes PREDICTABLE.
I have gone over this so many times. The Placebo Effect for Alzheimers is GONE before 12 Weeks! Does not exist. After 6 months it is plain cruelty to keep patients on a Placebo when it comes to AD. Since we have so many failed Placebo AD patients already , honestly it's ridiculous to have any Placebo group unless you are blinding caregivers so they don't cheat, the patients could not cheat if they wanted to.. and believe me that wish they were able to cheat..
Anavexnow!