
Funny thing. I always thought DoubleFine and Tim Shaffer came up with the term "psychonauts" but while I was reading Michael Pollan's "How to Change Your Mind" (all about the history of psychedelics) he mentioned "psychonauts" refering to researchers and others who experimented with psychedelics. I took it to mean this term had been around a while.
It's clear though that Tim's use of the term refers to a more psychotheraputic journey.