this post was submitted on 23 Sep 2026
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That's called a somatic reflex. It doesn't function on its own and requires external input to do anything (be it a brain or a small mallet). In the case of your knees, it contains a nerve sensor that sends a signal to your spinal cord, which responds with a signal to the motor neurons in your leg muscles. It's not doing that action independent of your brain, and people with paralysis in their legs do not have this reaction.
Still a singular brain, which was my point. The "self" isn't relevant.
Still not analogous to AI. A bunch of sensor nerves that still communicate back to the central brain that fire synapses in the brain is not analogous to AI matrices. The mechanisms that make up our cognition and reactions are deterministic, whereas AI logic is pseudorandom. It's why you can ask an AI a question multiple times and get a different answer each time. It's why AI has a hallucination problem.
Also, just because you could hypothetically keep a hand and its nerves alive doesn't mean it will become Thing from The Adams Family. The nerves there will not become brains, and even if the sensory neurons continue working, they won't be sending any information to the motor neurons in the fingers. They are wholly dependent upon the central brain, not at all like a bunch of standalone AI systems working in concert.
This whole idea of a central computer style brain hooked into dumb synapses is very outdated. There is a wealth of information on this subject that has been developed over the last three decades if you want to study the science.
Are you under the impression that your brain would have done anything of note if it never received external input? Without external input your brain would have produced nothing more than static, to the point that your organs would have eventually shut down.
I think maybe we're hitting upon a terminology mismatch. There is one thing called a "brain". I agree.
This brain is made up of many smaller, independent, information processing subsystems. This is more analogous to "a bunch of autoregressive transformers snooshed together" than it is analogous to "a single system for processing all information".
Any system that seeks to recreate human cognition will have to do so with "a bunch of independent systems for processing information, squished together", and not "a single master program, like we thought in the 1800s".