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i'm no scientist but i believe that would be the case. even if dmt is confirmed as central to the previously mentioned states then there's sure to be a whole lot more to it (there always is isn't there?), i imagine a cascade of events involving a number of neurochemicals, there's probably more of them than we know now. full dmt release could be the climax of a series of events involving endorphins, serotonin, dopamine etc, then the 'not-so-peak' mystical states may not reach the top but still be consciousness altering.
That's probably the case. I've only taken introductory nurology and neuropsychology so I'm not an expert either. But I do know that while being observed through fMRI we can see that areas of the brain activate randomly. So I am sure that in the process neurotransmitters of all kinds are released. For example if you have a nightmare or a dream that is just scary, when you wake your heart will be racing and so forth due to adrenalin release.
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but it does bring me to another point i was going to make (if you can bear with me), that even if dmt is responsible for a number of these peak states then it doesn't necessarily mean it's the only 'key'. without even going into the non-drug methods, other substances like mescaline and salvinorin which are very different to the tryptamines still arguably provide access to the other side, so why not other endogenous biochemical conditions? unless we wish to go on to say that all of said drugs in some way cause the release of dmt in their peak if they provide such an experience?
Most substances that have an intoxicating affect do so because of several main factors; they contain chemicals that mimic neurotransmitters, they cause the body to release neurotransmitters and the body percieves such chemicals as toxic and reacts to it as though it were under attack.