Always great to see studies looking at the mental implications of non-psychoactive drugs. I suppose it's common to overlook the implications of a drug on the central nervous system with respect to consciousness, when the drug in question never causes any subjective/noticeable change.

I suppose it's all too intuitive, though. Even slight, unnoticeable changes in consciousness - to the point that even you don't notice - may in-fact be detectable on paper. I hope this leads to more research into the mental changes for other drugs classified as "non-psychoactive" (who doesn't love more data? :). Anyways, to end off by inserting some colloquialism into my thoughts here...

Trippy study, mannnnn.