[officialjunk]

in the sense that we could be "brains in boxes" like in the matrix, one could argue that this reality we experience could happen to a boltzmann brain as well. similar to a dream, in which the dream reality is a result of feeding all the senses with data from within.

[dahfizz]

An important distinction is that a boltzman brain only "works" for an instant before the harsh environment of space destroys it. There's simply no time for a whole dream matrix reality to play out.

[red75prime]

Another Boltzmann brain can pop up, which contains a short term memory of being previous Boltzmann brain. Sensory inputs aren't constrained though. Most probable sequence of such brains should feel like noise all over your senses, I think.

[marcosdumay]

Another Boltzmann brain can pop up with the result of whatever decision the previous brain could have made, the actual decision it made is irrelevant.

[quakeguy]

Why? The time passed for the Boltzmann Brain won’t necessarily be tied to its real frame of existence i think, it may simulate any timeframe imaginable, depending on its starting conditions.

[nfc]

In fact the simulation of any timeframe would be constrained by physical laws.

For example for a Boltzmann Brain with a similar chemical composition as ours the speed at which chemical reactions occur would limit the speed of experience.

For a Boltzmann Brain that simulates ours with a very different physical substrate the speed of light would still be a limit.