Maybe the brain is more a Radio than a Computer...
I love the "brain = processor running the simulation" idea, and yeah, it's a metaphor for our computer-brained era.
But there's an other take I keep coming back to: What if the brain doesn't generate consciousness at all, it just filters it? Like a radio picking one station out of a signal that was already there the whole time....
Here's why that clicks for me more than the computer idea: If the brain generates consciousness, less brain activity should mean less experience. But that's not what we see in some experiments.
Take certain "substances": People report the most vivid, "more real than real" experiences of their lives. While their brain activity (especially the Default Mode Network) actually drops. That's backwards if the brain is the source.
Or terminal lucidity: Dementia patients with "wrecked" brains sometimes get a sudden window of total clarity right before they die. The hardware didn't come back online. So where did the clarity come from?
Or NDEs during cardiac arrest, flat EEG and everything, where people describe experiences that are somehow sharper and faster than normal waking thought. That shouldn't happen if the brain's the engine. It fits fine if the brain's the bottleneck.
I'm not saying any single one of these proves anything on its own, self-reports are messy and there's real debate about all of it. But stack them up and "the brain restricts" starts looking like the better explanation than "the brain produces."
Bernardo Kastrup's analytic idealism, takes it further: Instead of matter being fundamental and mind popping out of it somehow, mind is fundamental, and matter (brains included) is just what mind looks like from outside. On this view you and I aren't separate simulated characters, we're more like localized eddies in one bigger mind (or simulation).
That's a different claim than simulation theory, even though people here tend to blend them. Simulation theory keeps the physical-stuff-is-fundamental assumption and just moves it up a level (we're a sim running on someone's real computer). Idealism ditches that assumption completely.
What I like about the radio idea over the simulation idea: nobody has to invent a hidden programmer for it. You can actually go poke at it yourself, on a cushion or in a study, instead of just speculating about a computer nobody's ever seen.