Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Effect of expectations-effectiveness classification on placebo-induced Δ in average VAS intensity ratings acquired over 20 min. Greater placebo effects were observed in those with a positive prediction error signal (Low Expectations and High Effectiveness), whereas Lower placebo effects were observed in those with a negative prediction error signal (High Expectations and Low Effectiveness).
