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There are other Groundhog Day questions and other Simulation questions. I believe this differs from all the others.

[This movie features a] ...TV weatherman who, during an assignment covering the annual Groundhog Day event, is caught in a time loop, repeating the same day ... [over and over]. https://en.wikipedia.org/wiki/Groundhog_Day_(film)

The point is that only one character is aware that same day is repeating. Others all start their day as normal and continue unless their day is altered by interacting with the main character.

If you woke up repeatedly like the weatherman Phil Connors and could convince* yourself you weren't merely dreaming or hallucinating, wouldn't your only other conclusion have to be that you were (a) in a simulation of some kind and (b) it is designed just for you?

The reason I say this is that if your universe is the 'real' one then it would have to reset itself purely for your benefit to provide your repeating experience. Resetting the actual universe is presumably much more difficult than resetting a simulation based on one viewer's point of view - yours.


  • When I say 'convince yourself' I don't mean prove it indisputably, I mean decide in your own mind - perhaps to preserve your sanity!.
Cyn
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chasly - supports Monica
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  • Stanisław Lem wrote a novel about such experience. AI was experiencing and creating "on the fly" it's own world based on all human experience recorded on wax rolls. The Dejavu effect was a result on rolls skipping and replaying the same content twice. And that experiencing dejavu was a proof of you not being real and just using provided content. – SZCZERZO KŁY Dec 05 '18 at 15:04
  • Psychology and perception questions are often closed as POB, but I'm not convinced that this question can't be answered objectively. However, you've asked the question that has as its one and only legitimate answer, "yes." That's because you've handwaved the issue of proving it wasn't a dream or hallucination - when that discovery is, in fact, the point. Can you make such a proof? How has science dealt with the distinction between dreaming, hallucination, and reality? You may need to edit your question, but I think there's a good question here. (Beware: it might also be a duplicate.) – JBH Dec 05 '18 at 16:22
  • @JBH - I didn't say you'd proved anything, merely that you'd convinced yourself (rightly or wrongly). I'm then asking if the only conclusion left is that you're in a simulation or whether there is a fourth or fifth explanation. Also the title implied that it was just for you. I've made this more explicit. Already I have answers that say, "no" so "yes" is not the only legitimate answer. – chasly - supports Monica Dec 05 '18 at 16:28
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    Did you just start your thousandth repetition of this day, but suddenly realized that having access to the internet means you can crowdsource your philosophical issues? – Emilio M Bumachar Dec 05 '18 at 17:51
  • @ Emilio M Bumachar - Didn't you say that yesterday? And the day before and ... – chasly - supports Monica Dec 05 '18 at 18:53
  • So we've got a few answers already, but I'd have a question I'd need answered before I put one forth: What precisely defines a simulation, and what does it mean to live in a simulation? It turns out the tiniest shade of difference in the definition of that word can completely change the entire answer. I'd also appreciate a related question, if possible: how do you know you can trust your memory of the previous day? – Cort Ammon Dec 05 '18 at 19:46
  • @ Cort Ammon - In my case I mean that jumping between parallel universes or time travel seem unlikely not to say impossible. A simulation would be an artificial world of limited scope that would be re-settable. For example I'd be prepared to accept The Truman Show as a simulation or a simulated computer world via brain surgery and VR. You don't know about trusting your memory you have just decided to - as I say, you've convinced yourself that you're not hallucinating or dreaming and based on that belief you are exploring what could be happening. – chasly - supports Monica Dec 05 '18 at 20:11
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    @chaslyfromUK I notice you seem to ask a lot of questions with interesting concepts, which lead to some fascinating answers, but always start with pages of back-and-forth clarifications and refinements in the comments. Have you considered writing your questions down, and reviewing them at a later date or bouncing them off an individual, to try and get them into the more "polished" form before they get posted to Worldbuilding? – Chronocidal Dec 06 '18 at 08:24
  • @Chronocidal - Thanks for the feedback. 'Always' seems a little strong. For example this question of mine has no back and forth, https://worldbuilding.stackexchange.com/questions/131247/would-a-moon-made-of-water-pose-a-threat-to-earth-during-eclipses - I just find it difficult to formulate some questions more than others. I'm working on it. – chasly - supports Monica Dec 06 '18 at 10:02
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    [SPOILERS] See the webnovel "Mother of Learning" for a groundhog day story very close to your question. [/SPOILERS] – Mindwin Remember Monica Dec 06 '18 at 11:40
  • @chaslyfromUK Fair point - it's probably just a false sampling bias from a) questions I think seem interesting and b) questions with the revisions being more "memorable" :P – Chronocidal Dec 06 '18 at 12:25
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    @chaslyfromUK -- That's exactly what the Sandbox is for: helping you formulate your queries before posting them! – elemtilas Dec 10 '18 at 05:52

11 Answers11

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No. It would not prove that this was a simulation for you alone, as there are other strong possibilities.

  1. This is a simulation, but not for you. Your memory of previous loops are due to a bug. Where your state should be reset at the beginning of each loop, for some reason your experience has been carried over to the next loop.
  2. This is not a simulation, you (or your consciousness) are really travelling back in time (to a preset point).
  3. This is a simulation and it is for you, but it is shared with others who you have not encountered (it isn't just for you).
  4. You're not in a simulation - but all of the "past iterations" you remember are artificially implanted memories which were simulated. (As suggested by Chronocidal in the comments. A particularly horrific one to realise as you choose to skip out on "this go round").

There are many other possibilities, many of which are included in other answers. The key thing is that your experience doesn't rule out enough other possibilities to conclude this is a simulation just for you.

littlefeltfangs
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  • (1) Fair point, (2) If you are really travelling back then you are affecting everyone's future maybe even setting off a butterfly effect - possible though, (3) Also possible. – chasly - supports Monica Dec 05 '18 at 17:12
  • @chaslyfromUK In the movie, the main character did wind up changing people's lives by doing drastically different things the final time around than the first time. – David Thornley Dec 05 '18 at 18:43
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  • You're not in a simulation - but all of the "past iterations" you remember are artificially implanted memories which were simulated
  • – Chronocidal Dec 06 '18 at 08:21
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    On 1. - In reality, the "groundhog day" trope is a lot older than the movie in science fiction stories. One particular story using it was about 1. - one person fell asleep under his boat (or car?) as he realised everybody was repeating their day. Turns out that if he was under the vehicle at night, his memories remained, while everybody else was apparently "reset". He eventually found out his entire city was a (non-virtual) simulation to test ads on humans and see how they respond. Every they'd sweep and wipe all memories of the day, unless you were protected by a sheet of metal. – VLAZ Dec 06 '18 at 08:59
  • @vlaz Do you have the name of that story? Earliest example of this trope might be a good question for scifi if it hasn't already been asked. Edit: Never mind, both have answers https://scifi.stackexchange.com/questions/125472/story-about-a-guy-living-same-day-over-again-until-he-falls-asleep-under-an-alum https://scifi.stackexchange.com/questions/153853/which-sci-fi-or-fantasy-work-introduced-the-idea-of-infinite-time-loop – littlefeltfangs Dec 06 '18 at 09:03
  • @littlefeltfangs I don't have the name of the story but I know I can find it around Christmas-time when I go back home. I also know it's not the first one - it's probably from the 60s or so and not the first iteration on the trope. It's a bit funny how many there are. Anyway, if you want, I can post a question on sci-fi about the story listing identifiable elements. If nobody else recognizes it, I will self-answer within a couple of weeks time when I manage to look it up. – VLAZ Dec 06 '18 at 09:12
  • #2 is called "mind time travel", also featured in "Butterfly effect" and partially in "Life is strange" (but the time travel rules are inconsistent there). Here's a VSauce video about types of time travel, including this one: https://www.youtube.com/watch?v=VpB3kan4BHQ – Fabian Röling Dec 06 '18 at 09:18
  • Not to mention a literal infinite number of other possibilities. – Shufflepants Dec 06 '18 at 16:58
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    @Chronocidal Or you're just going crazy. The "past memories" are just a figment of your imagination and you are not of sound enough mind to be able to tell the difference (e.g. the same way that sometimes you are convinced of very obviously false things being true while in a dream) – SamYonnou Dec 06 '18 at 19:14