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Infants can only perceive in one dimension (closeness and farness). Young children can only perceive three dimensions (they can't plan or handle time). Teenagers and young adults can perceive 3+1 dimensions. However, this is all psychological and dependent on our personal growth, which means that someone could exist who perceives more dimensions than 3+1 and it wouldn't be a logical contradiction.

Is there any way to empirically test whether there are more dimensions? If there were 3+2 dimensions, then I could have a clock that is two-dimensional. Or I could have one clock that would tick in one dimension and another clock tick in another dimension.

How can we design an experiment to test this?


marked as duplicate by Jon Custer, Qmechanic Aug 3 '18 at 10:28

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    $\begingroup$ Related: physics.stackexchange.com/q/72979/2451 , physics.stackexchange.com/q/4079/2451 and links therein. $\endgroup$ – Qmechanic Aug 1 '18 at 21:58
  • $\begingroup$ You can't count dimensions, but you can count accessible dimensions of at least a given size. String theory famously predicts several very small dimensions we can't yet detect, with M-theory implying structures could vary in how many large dimensions they bear. $\endgroup$ – J.G. Aug 2 '18 at 7:41
  • $\begingroup$ As a father of several young children, I'd argue that they can perceive time, they just don't understand the human concept of what constitutes a minute vs an hour. $\endgroup$ – Kyle Kanos Aug 2 '18 at 10:21

I don't believe that it's generally possible to test this in-principle. Assuming that we are part of a multi-dimensional manifold but that all our physics is limited to a 4-dimensional sheet within it, there would be no experiment that will show that there are more dimensions.

Now it could be that not ALL our physics is limited to this 4-dimensional sheet. In which case experiments in our 4-dimensional sheet could interact with bodies that enter and exit from other dimensions, and thus probe these dimensions. There are experiments in the LHC that may probe such eventualities.



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