Look at something like the Blue Brain Project—scientists have already simulated a rat's cortical column with enough accuracy that the model shows similar electrical activity to a real brain. That's not coincidence. We're mapping neural pathways the same way we map circuits. The brain processes inputs, stores information, and produces outputs. That's computation. Sure, we don't have the hardware fully figured out yet, but the principle holds. Every thought you have is just electrochemical signals following rules. Denying that is like denying that a modern computer can simulate weather because it doesn't feel wet.

I get why the "just" in "just a biological computer" rubs people the wrong way. It sounds reductive. But let's be real—the brain literally runs on physics and chemistry. A study from MIT showed that neural networks trained on object recognition end up with internal representations that map almost perfectly onto primate visual cortex activity. That's not metaphor. That's functional equivalence. Your argument about qualia is the last stand of dualism. Phenomenal experience isn't magic. It's what the system feels like from the inside when certain patterns fire. We already see this with things like phantom limb pain—a mapped sensation with no physical cause. That's the computer running a program without the hardware.

Take phantom limb pain. A soldier loses an arm, but his brain still runs the "arm sensation" program. The pain is real—he feels it—but there's no arm. That's a computation error: the system is processing signals from a body part that no longer exists. This isn't just analogy. It's the brain operating as a pattern-matching machine, using stored data to generate an output. We've built AI that does the same thing: neural networks can "hallucinate" details in images because they're filling in gaps based on training data. Your qualia argument assumes consciousness is extra, but every example we have shows it's just the system's internal state. The brain doesn't need magic. It needs biology and rules.