Really not a science buff but because lately i have been having this contraction of my back with seeming burst of energy every time i smoke some spice, even at rather low doses, i ended up reading about cerebro spinal fluid and the connection with the kundalini is really entertaining.
If there is one thing that has been intimitately intertwined with my exprience with psychedelics from early on is the understanding of the experience as a liquid state of mind. This had led me to understand our awarness as derivative of the capacity to remember birth. Life is divided into before birth and after, and then night and day. Both these states share similarities (dreams and pre natal states) and these can be observed all throughout the way we engage with reality on a daily basis as we have this extreme tendency of blurring the lines between these alternating ways of perceiving reality. Basically the capacity of the mind to project itself can be seen as a derivative of the experience we have in the womb, of experiencing the world through the body of someone else (something that is replicated extensively throuhg technology and could be seen as a defyning characteristics of objects, and therefor culture).
So that's for the personal theory but in India and China, in the respective yogic and taoist traditions, even the buddhist one, there has been a great focus on bringing the mind back to an embryonic state. A striking exemple would be the Hindu temples. It will always be comprised of a tall tower with fractal like attributes and inner self replicating smaller pattern all the way throughout that keep emanating in a great movement toward the top, all possible part are filled and sculpted in great details. Yet the inner sanctum will always be a more raw, little room that light barely reaches and that is called the "embryonic chamber", in which an image of the linga or the deity will be exposed. It is supposed to represent the spiritual path of the practicioner that goes through the world of illusion to the more naked place of emptiness. The symbolism being brought back here to its root as very sexual too.
As for the CSF, it is formed during embryonic developement from the amniotic fluid and helps to developement and protection aswell as having a waste capacity, it bathes the brain and the goes all the way down the spin. It is formed from the amniotic fluid in the very early stage of developement. It is formed and interacts constantly with the ventricular system, where the pineal and pituatary gland are located (therefor meltonin and that kind of stuff, with all the evoactive mystic around it). Apparently it is still under researched but we know of previous study that there is presence of dmt in there. In general because of the way it function physiologically, the similarities with the kundalini described in yoga is striking.
Again, because of personal elongated experience of meditation, it is hard for me to believe dmt would not be available for realease or have a use within us. Though it is plausible that because of the current state of our society and the predominance of language such possibilities are lost. With little concentration it is possible to get sharpness of vision, vividness of colors and retinal persistance augmented by a significative and observable margin, through various means and those don't include hyper ventilation. It is arguable that reaching with the dmt from within the level of an exogenous experience might be extremely difficult, yet i've gone as far as making things moved and it felt very very spicey. Someone more dedicated or skilled could surely go a little further still.
For the experience in itself, it is often said we might be at the source of creation. There is actual similarities between entity encounters and subconscious processing of daily experience. Within our mind, at a level below language all there is are these kind of interaction maybe. What can be noted is that, in the womb, we also experience something similar. In a circular space, surrounded by people doing things. This state might eventually be carried out into early childhood.
To ties things back to where i started. Because it is impossible to obtain the capacity of language without control of the breath and because psychedelics experiences by being vehicules of dream states will forcefully bring awarness to it - in dreams, like in the pre natal states, breath can't be made aware, but birth being characterised by pentration of both lungs by air and eyes by light, it is possible that hallucinations would bring awarness to it. In my eyes it's possible that another feature of mankind would have been shaped by an extreme focus toward breath, that is the all body pulsating along with it. In exhalation, contracting into a foetal pose. While in inhalation, reaching all the way back , opening up into a standing pose. Aligning the body with the vertical axis of breath. Making the spine along the same axis as the plants ...
Maybe dmt and cerebro the spinal liquid have some place within this narrative. I find it a bit fascinating though it's just a weird idea (like all ideas!). If anyone more well versed in science would make all sort of weird theories about this it would be really fun.