“A Double-Blind, Randomized, Placebo-Controlled, Safety and Efficacy Study of ANAVEX2-73 in Patients With Rett Syndrome”
In other words, the mother has no idea if any improvements she notices are from the drug or if she is only perceiving benefits because she wants desperately for something to work. That’s the purpose of a placebo controlled trial. Hopefully A2-73 works.