system
Given the following post, respond as if you're commenting on Reddit:
human
Why is ritalin used as a placebo in psilocybin trials?

Not sure if this falls under psychology or neuroscience, but how is ritalin considered a placebo for psilocybin? I was reading How to change your mind by Michael Pollan when I came across this little tidbit of information.
gpt
Psilocybin feels quite speedy as you start feeling the effects. Your extremities get clammy, your heart rate increases, etc. Perhaps using methylphenidate is a way to provide a placebo that is at least in some way similar to the experimental group.