(I sincerely apologize for the length of this post, I actually had to remove a good deal, this is the shorter version, if you can believe that)
I don't mean to be a downer, but I still see the entire premise as being flawed, I mean I think understand the concept, to see if everybody enters the "same" environment, thus generating consensus on the environments reality, I just feel the premise is flawed, a brain injured individual does not interpret this reality in the same way which we do, so I doubt they would interpret the DMT space in the same manner which we do, and even if they did I fail to see how anything would be proven...
...when it comes to the "reality" portion, the DMT experience is real, it can be experienced on demand, at any time. Anybody can have it, it is repeatable, and verifiable, whether it's a reality generated in the mind, or an actual conscious continuum seems to be irrelevant.
The reality we experience now is generated by your mind (technically, but I'm not getting into this here )
Like I said, is the world bank real? Is the value of a dollar real? Or are these things that people just made up in their minds and agreed upon? A bank is an idea, or a group of people representing an idea, and a dollar bill is just a piece of paper, the majority of our "reality" consists of concepts which only exist in the minds of humans, they were invented by and agreed upon by humans.
Is Jesus real? ...Yet Jesus has had more influence and impact that many "real" individuals that you interact with in the "real" world...
So what is real?
Is proving the reality of the DMT experience even a worth while endeavor? Somehow I don't think so.
Science is looking into these experiences. Because of the vast similarities between authentic mystical states, near death experiences, out of body experiences, certain types of abduction phenomena, and so on, science has decided to attempt to use these entheogens to "map the terrain" as it were, I could go into great detail here, however, terence McKenna offers linguistically rich and eloquent insights regarding this specific matter, so I will reference McKenna rather than articulate these myself:
Now, a good deal of the research has been leaning in this direction. Doctor Rick strassman and his work probably being the best known. The heffter institute (founded by Denis McKenna and David E. Nichols) has been doing some amazing research which is consistent with terence's early ideas on the matter (as well as a good deal of research in other more seemingly practical areas)
Below is a compilation of miscellaneous research projects regarding psychedelic compounds, perhaps it can be useful in giving you an idea of how these research programs are constructed, and how psychedelic research is conducted:
[URL unfurl="true"]http://m.pnas.org/content/113/17/4853.full[/URL]
FMRI research
Individuals like Darrell lemaire, sasha shulgin, and Casey hardison also completed tons of very valuable unauthorized research:
These below David E. Nichols lectures are great for basics with psychedelic research, there's some chemistry, some SAR activities, there's pharmacology, physiology, and an overview of the basic foundations of this type of research.
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-eg