Aren't psychedelics by definition mind altering? Sounds hard to find a psychedelic that isn't influencing the mind. Some mild hallucinogenics might work, but t

Aren't psychedelics by definition mind altering? Sounds hard to find a psychedelic that isn't influencing the mind. Some mild hallucinogenics might work, but then the participants may not have mushrooms experience before, otherwise they know when to be fooled.