How does a control group work here? It's (presumably?) pretty clear to the people who got the mushrooms
the study compares effects both reported and measured.
double blind is important to not introduce "outside" influences, but it's not intended that the subject not experience what they take, quite the opposite, that's what is being measured.
If the people who took it report dizziness (aha!), but the people who took the placebo also report dizziness (doh), then that's not evidence that the drug produces dizziness.
You mean that blinding is not meant to be able to separate the effect from placebo? If so, I don't agree. I often hear it mentioned in the context of psychedelic research that it is a problem that psychedelics result in unblinding. E.g. Carhart-Harris the other day https://twitter.com/RCarhartHarris/status/151390616463902310...
the study compares effects both reported and measured.
double blind is important to not introduce "outside" influences, but it's not intended that the subject not experience what they take, quite the opposite, that's what is being measured.
If the people who took it report dizziness (aha!), but the people who took the placebo also report dizziness (doh), then that's not evidence that the drug produces dizziness.