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1.would it be possible to achieve such stability and realism in a lucid dream to the point where you would never EVER be able to recognise the difference? Every single individual acts as expected (and sometimes unexpected of course, but not to the point of breaking realism). The only difference being is that you have this knowledge.
It would no longer be considered a dream then. In a rudimentary formula:
D= [(P-Sut)/(AMe)] or translated Dreaming= (Perception minus Sensory Input under threshold) dividing by Autobiographical Memory expression
(Yes I made that up ^^); (And yes, I do wonder if you can dream without autobiographical memory....I think you can....and patients that can't form new memories can still dream with new content...)
Altering the formula would fundamentally change the experience: In order to eliminate any change of volatile sensory input (don't even think it's possible), you'd change to control the dream entirely, and that just wouldn't work. That's the big difference between it and waking life: in the later one your perceptual processes are restrained by sensory input being conveyed by matter.
That also brings us another issue that is explored in the movie Inception: if such realism was achieved, how could you tell you had woken up for real? Many people would actually end up in the same existential trap as Mal did.
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2. But what if we were to CHANGE ourselves? Change the way we think, change our memories so we forget specific things, choose to become smarter, basically change our entire identity. I understand these things are probably not carried into waking life, but my question remains within the lucid dream itself, and I'm talking permanent change - not temporary.
The short answer is yes, it is indeed possible: theoretically exposure therapy can be applied in lucid dreams, and many other forms of medical care could be applied as well. There's even a study by Sidarta Ribeiro which explores physical coordination through the practice of lucid dreaming. and we're only scratching the surface. The big obstacle here towards the validity of these methods is somewhat obvious: we don't possess a reliable and quick way to induce lucidity on individuals, and most of these methods require consistency over time. If you skip this step, then sure, we know for a fact that just the act of thinking can impact cells to some degree. Hell, even some people use lucid dreams to practice skills (many of us are practicing for the day they invent anti-gravitational devices that will make us be able to fly like super-man :P)
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3.Asking your subconscious to 'design' or 'choose' the BEST answer. Let's say you wanted to think up, or create, a certain individual using your personal preferences. Using the example of attractiveness, if you were to tell your subconscious mind to think up the most attractive individual you could EVER possibly think up of, would it work as expected?
Your subconscious is already "hearing you" all the time. Besides, it's not an entity but a bunch of processes that escape your normal awareness. It would be like telling your brain stem to breathe in the most appropriate way possible: he'd be like "Dude, I already know what I'm doing, I'm going to keep functioning the way I think I should!". In your specific case, all your brain is doing is attempting to retrieve the most significant memories, it's not choosing what image to put in front of you (this is actually a good dream control trick: going with stronger/more realistic memories tends to help than screaming "Subconscious, turn the sun into a 1km ball of ice with 3 layers of my favorite icecream topping!".
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4. I was wondering if you could 'permanently' change your emotion. So let's say you want to always be happy or even depressed forever, would that be possible? I believe so, though I haven't tried.
No. First of all, emotions aren't long-lasting (for the most cases). Second of all, even if you did (let's say you managed to find a way to stay in a dream for 20 years), chances are the behavioral response to stimulus would be reverted. Besides, "happiness" is a very controversial thing to define.
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5. Have you tried asking the subconscious mind about reality and the way things work? Asking things such as certain chemical elements or the way a chemical ingredient would react with one another. I'd expect things to act the way you'd expect it to act. But try some of these things in waking life and see if it is true. Almost as if 'borrowing' information from life itself.
Same situation as 3. Besides, even if you could get information from your dreams, it's not a falsifiable theory: how could you prove it was your subconscious giving you information and not a mixture of memories being replayed in scenario with less logical constraints?
6. Meh, personal question I'll pass xD Hope this helped :)