Alright, I've been thinking about this, like, all of yesterday afternoon and this morning, and here's what I could come up with lol. Not set in stone by any means yet but this is probably going to be my most solid theory for now. First I'm going to explain why I believe that relatively intense time dilation is possible. I'll be doing this using the experiences that I believe are the ones that can the most consistently provide sensations of significant time dilation, which would be those of hallucinogenic drugs. Then, when I've gotten my point across about that, I'll relate it to dreams. Before I get started though, I do need to cover my views on what consciousness is so that this can make sense.
I personally believe that what we are experiencing at any moment, the point of view that allows us to see the world, is a result of our encoded sensory perceptions being written into memory. This, I feel, is supported pretty well by the fact that it is possible to experience "blackouts", such as on alcohol, benzodiazepines, anticholinergics, and etc., wherein our bodies are able to continue functioning with at least some level of normalcy despite the fact that we won't even experience it. I want to highlight that fact: it's not that you recall experiencing it but just can't remember it, it's literally like it didn't even happen. If you've ever had way too much to drink and hit that point, or taken too high of a dose of alprazolam or something similar at once, you'll know what I mean. It's like you're there having a good time, and then suddenly you're just waking up the next day, despite all the stuff your friends tell you you continued to do after that point. I believe that this simply reflects the fact that these drugs effect the memory systems of the brain more potently than things like motor actions, so even though those things are inhibited, they're still able to function even when things like memory and therefore consciousness fail. I also believe that this idea is supported very well by the fact that the parts of the brain involved in memory are also those involved in hallucinations. When that process of memory recording is significantly altered, it will show through as our minds start to record incorrect information and we see the results as hallucinations. This also ties into the fact that dreams happen when those memory systems are running at very high capacity, so that the reason we experience dreams is because our brain is being stimulated to the point that it's recording memories even in an absence of external information. To me, these things pretty much all but prove it, but I'd also be willing to give more examples if anyone wanted any.
Now, on to the time dilation. I believe that the first major player in this is the speed with which memories are recorded. As I see it, the easiest way to enhance this is to increase the amount of information that your mind is recording all at once, and nowhere does this stand out better than with a psychedelic experience, especially one like DMT. DMT is well-known because a trip from smoking it can easily seem to last hours for many people despite the fact that in reality the trip only lasts about five to ten minutes. This can sound absurd, but I believe that when you piece it together it's entirely logical. Psychedelics work mainly through the 5-HT2A receptor in the brain to create their effects, which I will detail here. First, there's the fact that these receptors in the prefrontal cortex have a facilitatory control over dopamine release from the ventral tegmental area, which is the source of dopamine neurons involved in perception. This means that when they're activated, things that would normally release a set amount of dopamine will release more than normal. Sight, sound, taste, touch, smell, imagination, learning... anything that normally involves dopamine will be enhanced, which means it will take up more of your focus at once. In addition to this, the dopamine release to the nucleus accumbens, and possibly other parts of the brain as well, will lower your latent inhibition. This is our basic ability to filter out irrelevant stimuli, and it is disrupted in conditions like schizophrenia. What it basically comes down to is that not only will all of your sensations be enhanced, but you'll pick up more of them; things that you normally wouldn't notice, background sounds like white noise or distant sounds, the specific textures of objects in your peripheral vision, smells that you've gotten used to, etc., will all reach the forefront of your perception as if you were paying close attention to them, in addition to the things that actually are right in front of you anyway.
This is how psychedelics enhance the regular sensory data you're already getting, but there's so much more than that going on too. In addition to all of that, 5-HT2A receptors exist on their own pretty densely in several sensory areas of the brain, and this is why psychedelics can cause hallucinatory sensory perceptions to overlap the regular ones. The most easily noticeable of these is there effect on the visual cortex, which is responsible for things like tracers, light and color distortions and intensifications, visual feedback errors, fractal patterns, wave-like distortions in the integrity of 3D space, and, in higher doses, total loss of normal visual function stretching into the perceptions of objects twisting, bending, morphing, and self-perpetuating at impossible angles and dimensions. These are by far the easiest changes to comprehend (and that's really saying something), but keep in mind that these kinds of chaotic alterations will be happening to your other senses as well, though I would say usually a little less intensely than with the visuals, but it's still some pretty heavy stuff. Now, what you have to remember, is that these changes are happening in the raw sensory areas. As far as your brain is concerned, there is no difference between these drug-induced signals and ones that would come from actually seeing these things in the external world, which is why they seem as real as actual perceptions at the time. However, where that is significant is that the brain will also be releasing dopamine from these senses in addition to the regular ones. That means that everything I said before, about your regular senses becoming intensified from facilitating the ventral tegmental area will apply to these as well. But it doesn't stop there. 5-HT2A receptors also exist in the parts of the brain that are significant the the proper integration of sensory information as it travels from its raw format to be used to create the world we before us. Because of this, not only is the information further altered, but sensations such as synesthesia can begin to occur, or senses blending together. This means that not only are all these heavy, heavy sensory signals being used to construct their own sense, but your other senses well.
On top of everything else, psychedelics also stimulate the areas of the brain involved in focus and memory. Because of this they are also directly hallucinogenic, and in high enough doses can cause out-of-body experiences and full dream sequences. These areas of the brain actually cause complex visions by working together with areas of the brain involved in higher visual processing functions, not those specifically for just receiving raw information, but for recognizing things like faces, bodies, letters and words, numbers, familiar environments, and etc. Normally, when we dream, these areas are being activated by these memory centers and nothing else, since areas such as the visual cortex are silent, which allows for recreating relatively normal scenes. However, since these sensory areas are actually even more active than when we're sober and awake when we're on psychedelics, both the input from them and from those centers will be blended together. And just to add insult to injury, 5-HT2A receptors exist in those areas of the brain as well, which means there will be a third, totally unique set of information coming into them that will unite with the other two to form the massively chaotic worlds that psychedelics can bring us to. Nowhere is this better exemplified than in a DMT breakthrough, which is basically like being in an incomprehensible alien landscape that seems even more "real" than the real world.
So like I said, my main idea for how to cause time dilation is to increase the amount of information you're taking in at once. This reflects my aforementioned view that our perception of time is the measurement of the measurement of change; the amount of these measurements that we are writing into memory all at once makes time slow down the higher it gets simply because we are perceiving a larger amount of information in a shorter amount of time, but to us we must still understand this information at what feels like a normal pace, which makes the rest of time seem slower by comparison. So if you've been paying attention, you can probably tell where this is going. There's never going to be any other time in your life when your brain is handling such an absurd amount of sensory information as it is in a psychedelic experience. Given all this, if my theory about how our perception of time works is correct, it seems considerably more plausible to me that an experience which only lasts a few minutes could feel like a few hours. However, that is putting it on the very light side of things, and many people claim experiences that last much longer. However, a DMT breakthrough is simply like an intense psychedelic dream, which I believe is only scratching the surface. All psychedelics, DMT included, can take it a step further than that to what many people refer to as a divine unification with the universal unconsciousness, the Godhead, ego death, or whatever you want to call it. For what it's worth, I've heard of this happening in dreams both lucid and non-lucid before as well, but it wouldn't be on top of all of this sensory information. What's significant about it is that at this point people begin to describe feeling as though they take up infinite space, or are processing an infinite amount of information, and coupled with delusions of grandeur and reference could reasonably be why there are perceptions of speaking to or becoming God. As far as I'm concerned here, these "infinite" perceptions may be simply more along the lines of... for example, trying to imagine having a quantity of an item represented by a number with a hundred thousand digits. It's something that is definitely finite, but is so large as to be completely incomprehensible by any human mind no matter what they do. Given that amount of stimulation that all of these different areas of the brain involved in perception are receiving at the same time, I could definitely see it being the same kind of thing. But of course, where it matters is that fact that the amount of information being processed can seem infinite. If that process is intimately tied to our perception of time, then couldn't that logically seem infinite too in the same scenario?
Before I move on to the next thing, I'd like to make one last point about something. This is a concept which I'd like to call "retrograde" time dilation. On psychedelics, and other drugs, there is an effect where altered or disrupted memory storage makes it seem like a much longer time has passed since the last thing you remember than actually has. I personally believe that this mostly occurs because memories seem more fleeting. On a high dose of a psychedelic, this can become so intense that things that happened moments ago can seem almost like a different lifetime. I would wager that this also plays a pretty important role in the perception of how long these experiences feel.
So, at this point I feel safe in thinking that it's possible for the brain to reach these "infinite" experiences. However, this is obviously not an option when it comes to dreams, because there's no way you could have that unbelievable sensory overload while in a regular dream. So the next thing I have to ask myself is, how exactly is the brain convincing itself of these things downstream, and can this process be activated in the absence of all that sensory data? To make clearer what I mean, take this for example. When glutamate is released and activates metabotropic glutamate 1 receptors in the hippocampus, it induces the synthesis and release of endocannabinoids which then activate CB1 receptors and cause downstream cannabinoid effects. That means that those effects are a direct result of glutamatergic activity. However, if you actually directly activate CB1 receptors through some other method, the easiest to explain being through a drug like THC, then the levels of glutamate drops and glutamatergic activity lowers. But this doesn't stop that CB1 activity from being activated anyway, so in some ways your mind can think that the same kind of thing is happening that would from activation of those glutamate receptors, even though it isn't. By this logic, I ask myself if it's possible for the brain to be pushed to the same amount of processing power through some other method.
The first thing I had to consider was the way that adrenaline rushes cause time dilation. They do increase your focus on your surroundings, but they also begin to cut out subjectively unnecessary data such as color. While following that train of thought, I arrived at dissociatives. See, people throw the word infinite around a lot with psychedelics, but whenever I hear it generally what I take it to mean is just that it felt too long for them to measure. But when I hear someone say something like "I was tripping for a thousand years.", then I know they mean business. This is the kind of thing I hear with dissociatives, like salvia and DXM, and many people claim that dissociatives are much more intense than psychedelics. The way they work though is more often than not the exact opposite. Psychedelics enhance your sensory perceptions, whereas dissociatives dull them. I've often heard people relate the experiences by saying that psychedelics show you what it's like to be everything, while dissociatives show you what it's like to be nothing. But despite this, it's a nothingness in the form of an infinite void. So if a seemingly infinite amount of space is perceived, could it not be somehow related to the space that psychedelics bring you to, regardless of what else is going on at the same time? The connection with the adrenaline rush would be that in both of these cases, the amount of processing power given to our surroundings is increased while the actual amount of data used to construct them slowly decreases. An adrenaline rush is not going to take you so far as to become redundant, since it does require you to still be able to interact with at least some of your environment, but drugs are not limited in the same way. Furthermore, dissociatives do cause hallucinations, which means that they must be altering the same memory and perception centers of the brain as psychedelics in some way. However, because on a dissociatives concept such as identity and sources such as external information shrink to nothing, the amount of energy that would be required to record the experiences should logically decrease by quite a bit.
The thing I think I can most easily relate this to is being bored. They say time flies when you're having fun, right? But when you're bored, it just drags on all day. I personally feel that this could be because you're not significantly changing the amount of processing power the brain uses there, but you are changing the amount of information it needs to store. Because of that the memories can be written quickly and more efficiently, which I believe means that your perception of time will lengthen. So in that way, you could apply the same logic to psychedelics and dissociatives. They both take you up to an "infinite" space, but one of them requires an incredibly higher amount of information to write in all at once, so the brain does still have to cut back a little bit on how quickly it can work it all in. But without all that extra junk data to pay attention to, it's able to divert even more power to that memory system. Another thing about dissociatives too is that they disrupt memory storage even more strongly than psychedelics, so that retrograde time dilation I mentioned could be even more significant here.
So, now we arrive at dreams. During a dream, particularly a lucid dream, the mind tries to recreate a relatively normal perception of self-identity. The brain does shut out external sensory perceptions while dreaming too, but not completely and it still invokes more normal sensory processing methods than would be used on a dissociative. Obviously, the ideal goal is to try to construct a realistic simulation of reality. Because of these things, the normal dream state sort of lies in between the psychedelic and dissociative experiences, not necessarily too much or too little sensory information or rational thought processing. Focus is also normally lowered in dreams as we all know, it takes becoming lucid even just to bring it up to normal levels. These things conspire to make time flow much more normal compared to waking life than a hallucinogenic experience would be. However, I do think there are some things to consider. First of all, as anyone who's ever had to wake up every day at the same time knows, the brain is pretty damn good at keeping time. For this reason I find studies such as the one by LaBerge which measure dream time to mean very little in terms of concrete information. Could it not simply be that dream time flows differently until we divert enough attention to accurately measuring it? This relates to what Sageous said about just ignoring it, but I am taking it in a different direction. My next thought is that even though things are more normal in a dream than in a trip, they're still not completely there. Activity of the memory areas are still high, and no matter how much you think you're perceiving in a dream, it's not nearly as much as you would be while awake. Signals from your physical body will be absent, as will many things in your environment that you're not directly paying attention to. Your brain can use shortcuts to create these things, whereas while awake it would need to pay much closer attention to what was going on. Because of things like this I don't think it's entirely absurd to suggest that the dreaming brain is writing memories more easily than the waking one would be.
As I said before, I feel that the ability to dilate time in an internally-generated world would be much higher than in the waking world. This is because no matter how quickly you're registering what's going on while awake, your body and the things happening around you are occurring at the same speed, which causes things like slow motion. This need not necessarily be true in the brain, as it's quite possibly that in addition to encoding experiences faster it may be creating them faster as well, as I do think that the two are intimately connected. If that was the case, you could genuinely be experiencing things at a normal pace despite the fact that they're happening faster than normal. Furthermore, I have to ask myself, if that is the case, how easily these factors can be changed both by default in a dream and by methods like dream control. For instance, if it was possible to normalize time by paying attention it, then would it be possible to shift it in the other direction as well? I remember reading a time dilation dream control method once, here on DV I believe, that involved sitting in a white void and watching a clock tick seconds by and imagining them happening slower than normal. If it did work that way, wouldn't that seem like an entirely logical way of changing it? Especially since the void would cut out even more detail, allowing your mind to focus more heavily on that. And if it's possible as a method of dream control then surely it can happen without it too, even if it wasn't likely to happen often. And of course, lastly there is the fact that memory storage is inhibited in dreams compared to normal, which could account for a retrograde effect in dreams as well.
Anyway, this post has already gotten incredibly long and I'm afraid that because I've typed so much I may have missed some of my points, or that I would if I continued to type more, so I'm going to stop now. But this is pretty much what I'm working with as far as time dilation goes right now.
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