LSD microdosing experiment: pair 15: placebo then active?

Created by gwern on 2013-02-06; known on 2013-02-07; judged right by gwern on 2013-02-06.

• gwern estimated 65% on 2013-02-06
• gwern on 2013-02-06
• gwern   judged this prediction right on 2013-02-06.