[bakuninsbart]

Cantor talks about countable and uncountable infinities, both computer chips and human brains are finite spaces. The human brain has roughly 100b neurons, even if each of these had an edge with each other and these edges could individually light up signalling different states of mind, isn't that just `2^100b!`? That's roughly as far away from infinity as 1.

[somewhereoutth]

But this signalling (and connections) may be more complex than connected/unconnected and on/off, such that we cannot completely describe them [digitally/using a countable state space] as we would with silicon.

[chowells]

If you think it can't be done with a countable state space, then you must know some physics that the general establishment doesn't. I'm sure they would love to know what you do.

As far as physicists believe at the moment, there's no way to ever observe a difference below the Planck level. Energy/distance/time/whatever. They all have a lower boundary of measurability. That's not as a practical issue, it's a theoretical one. According to the best models we currently have, there's literally no way to ever observe a difference below those levels.

If a difference smaller than that is relevant to brain function, then brains have a way to observe the difference. So I'm sure the field of physics eagerly awaits your explanation. They would love to see an experiment thoroughly disagree with a current model. That's the sort of thing scientists live for.

[lettuceconstant]

[flagged]

[tomhow]

> Please refrain from posting arrogant comments on topics in which you are out of your depth.

Swipes like this are against the HN guidelines. Please take a moment to read them and make an effort to observe them when commenting here.

https://news.ycombinator.com/newsguidelines.html

[chowells]

I, uh... What? Did you mean to respond to some other post there?

I can't see how anything you said is a response to anything I said. My statement was very simple: if two models predict the same result, you can use either of them. As far as we have worked out so far, continuous and discrete spacetime give the same results for every experiment we can run. If you have an experiment where they don't, physicists would really love to see it.

[lettuceconstant]

Firstly, my comment was overly antagonizing, sorry for that.

My problem is with the interpretation of Planck units; they really do not appear in current theories as signifying any theoretical lower limit to measurability, as I must interpret that you claim by saying:

> As far as physicists believe at the moment, there's no way to ever observe a difference below the Planck level. Energy/distance/time/whatever. They all have a lower boundary of measurability. That's not as a practical issue, it's a theoretical one. According to the best models we currently have, there's literally no way to ever observe a difference below those levels.

For example, the Planck energy is a nice macroscopic quantity of approximately 2 gigajoules. For the Planck quantities that are more extreme, the measurement is not hampered by the theory but by practical issues.

Sure, we don't expect our theories to hold at Planck length, but this is not due to something that's baked into the Standard Model or general relativity.