Before revision: The idea of a placebo effect —a therapeutic outcome derived from an inert treatment— was discussed in 18th century psychology,Schwarz, K. A., & Pfister, R.: Scientific psychology in the 18th century: a historical rediscovery.
After revision: The idea of a placebo effect was discussed in 18th century psychology,Schwarz, K. A., & Pfister, R.: Scientific psychology in the 18th century: a historical rediscovery.