nearbuy 3 days ago | parent [-]

The first article is about someone missing a cerebellum, not part of their cerebrum. That's the motor and balance part of the brain, and as you might expect, the subject of the article has deficits in motor control and balance.

The Biology StackExchange answer just says that frontal lobotomies don't kill you. It doesn't say that lobotomized people function normally.

The other two articles are just misreporting on hydrocephalus. This is a condition where fluid build-up compresses the brain tissue, making it appear like a large part of the brain is missing in CT scans. The pressure from the fluid is actually compressing the brain. While it can damage the brain, there is no way to tell from the scans how much, if any, brain matter was destroyed. Hydrocephalus usually causes death or severe deficits, but occasionally it doesn't.

Even assuming though that it were all true and people could function normally with little or no brain, that doesn't really tell us anything about LLMs, but rather just uppends all of neuroscience. It would seem to imply the brain isn't doing the thinking and perhaps we have something else like an intangible soul.

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adamzwasserman 3 days ago | parent [-]

You're right - I mixed up cerebellum/cerebrum/cortex terminology. My bad. The cases I'm referencing are hydrocephalus patients with severely compressed cerebral tissue who maintained normal cognitive function. The point about structural variation not precluding consciousness stands.

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nearbuy 3 days ago | parent [-]

Thanks for clearing it up.

> The point about structural variation not precluding consciousness stands.

Maybe, but my point about high-functioning people with hydrocephalus is that they have the same or similar brain structure (in terms of what exists and how it's connected), just squished gradually over time from fluid pressure. It looks dramatically different in the CT scan, but it's still there, just squished into a different shape.

The brain is also plastic and adaptable of course, and this can help compensate for any damage that occurs. But the scans from those articles don't have the level of detail necessary to show neuron death or teach us about the plasticity of the brain.

	▲	adamzwasserman 3 days ago \| parent [-]
		Fair enough. But the guy walking around with a gigantic caity where everyone else has a brain is food for thought.