A person without cerebellum can be perfectly conscious.
You have absolutely no idea that this is the case, neither does anyone else. That’s the whole point of the hard problem of consciousness. We don’t even have any idea whether a single neuron (or a single atom, or region of space containing a field, or any other subset of the universe smaller than a human brain) has even a little bit of consciousness. I think consciousness is probably the result of information processing and not dependent on specific physical processes, but claiming that we 1. know exactly what the cerebellum is doing and that 2. it’s definitely not involved or required in consciousness seems extraordinarily premature to me.
You have absolutely no idea that this is the case, neither does anyone else
Yes we do, because there are people with cerebellar agenesis who are able to live normal lives, so we have about as much evidence of them being conscious as we do for anyone.
If what you mean by “consciousness” is something like “ability to utter the words ‘I am conscious’ ”, then sure, but then why do we care about the number of neurons required to make a system utter those words? The main thing of interest here is trying to use baselines from neuroscience to infer things about which AI systems are truly conscious (what other debates were you referring to?), in the it’s-something-to-be-like-it sense. Being able to say “I am conscious” does not confer a system moral worth, it is its subjective experience that does that, and the observation that people without a cerebellum can live normal lives doesn’t tell us anything about whether it has affected the intensity of their subjective experience.
Ley’s put it lile this : if you had hours of interaction with this individual you’d have no reason to doubt it’s conscious. I indeed don’t know if it has the exact same sense of consciousnes as someone with a cerebellum but this is also true for everyone else : I don’t know if you and I have the same conscious experience either.
It seems like the important thing to ask isn’t whether we can know for certain if a person without a cerebellum is concious (since we don’t really know that for non-self people in general). More interesting to me is the question of if we’ve asked someone without a cerebellum if they feel concious. If the answer is “Yes, and they said they’re concious”, then I think that’s about as much evidence as we’re likely to get.
What are you talking about? There has been at least one case of a woman literally born without a cerebellum and nobody noticed until she had a brain scan. The neocortex was plastic enough to be able to take over the functions. She was much less coordinated than average as a child (she was able to speak intelligibly and walk unassisted by age 7), but otherwise behaved like a normal human. Are you seriously asking me to believe she’s a zombie? How do I know you’re conscious?
Exactly! You don’t! And all this talk of who is born without which brain region and how they went through life gets us no closer at all to actually understanding which physical systems are not zombies.
No, I wouldn’t agree that there are brain lesions that definitely makes you not conscious, I would certainly agree that something like complete brain death makes you less conscious, but we don’t have anything more precise than our vague intuitions born from N=1 subjective data to go by here. We have no idea which kinds of information processing actually lead to qualia. Is consciousness like mass and gravity? in that every tiny bit of the universe has it, and we only notice it when enough coalesces together? or is it more like a phase transition? with simple systems having exactly 0 consciousness, and it suddenly turning on at some level of complexity of computation? Or is the “complexity” even irrelevant, and consciousness refers to just very specific kinds of information processing? None of these questions can be resolved by looking at the behaviour of humans with brain damage, they require a full theory of how subjective feelings map onto physical systems.
Fine. Hard Problem. Maybe panpsychism. I’m not claiming anybody understands how consciousness works. I only object to the “absolutely no idea that this is the case, neither does anyone else.” Given the case I linked to above, we have more than sufficient Bayesian evidence (on balance) to believe that a person can be conscious without a cerebellum, and if that’s what you’re objecting to, I don’t believe you’re still arguing in good faith. If we were talking about the cortex instead, then I’d be with you, but we’re not. You are not allowed to claim everyone has literally zero knowledge given the state of the evidence. That’s just Bayes. You were surprised by the evidence. You should update, not double down.
I don’t like how it sounds but : i think you are missing a lot of biological facts about consciousness and that we’re not as clueless as you seem to think. I definitely recommend reading the book “consciousness and the brain” by stanislas dehaene which is basically a collection of facts onbthe topic.
You have absolutely no idea that this is the case, neither does anyone else. That’s the whole point of the hard problem of consciousness. We don’t even have any idea whether a single neuron (or a single atom, or region of space containing a field, or any other subset of the universe smaller than a human brain) has even a little bit of consciousness. I think consciousness is probably the result of information processing and not dependent on specific physical processes, but claiming that we 1. know exactly what the cerebellum is doing and that 2. it’s definitely not involved or required in consciousness seems extraordinarily premature to me.
Yes we do, because there are people with cerebellar agenesis who are able to live normal lives, so we have about as much evidence of them being conscious as we do for anyone.
Yes we do, it’s in the sources.
If what you mean by “consciousness” is something like “ability to utter the words ‘I am conscious’ ”, then sure, but then why do we care about the number of neurons required to make a system utter those words? The main thing of interest here is trying to use baselines from neuroscience to infer things about which AI systems are truly conscious (what other debates were you referring to?), in the it’s-something-to-be-like-it sense. Being able to say “I am conscious” does not confer a system moral worth, it is its subjective experience that does that, and the observation that people without a cerebellum can live normal lives doesn’t tell us anything about whether it has affected the intensity of their subjective experience.
Ley’s put it lile this : if you had hours of interaction with this individual you’d have no reason to doubt it’s conscious. I indeed don’t know if it has the exact same sense of consciousnes as someone with a cerebellum but this is also true for everyone else : I don’t know if you and I have the same conscious experience either.
So there is still a possibility that the cerebellum is responsible for some of the inaccessible aspects of consciousness?
I don’t understand what you mean by “inaccessible”
It seems like the important thing to ask isn’t whether we can know for certain if a person without a cerebellum is concious (since we don’t really know that for non-self people in general). More interesting to me is the question of if we’ve asked someone without a cerebellum if they feel concious. If the answer is “Yes, and they said they’re concious”, then I think that’s about as much evidence as we’re likely to get.
What are you talking about? There has been at least one case of a woman literally born without a cerebellum and nobody noticed until she had a brain scan. The neocortex was plastic enough to be able to take over the functions. She was much less coordinated than average as a child (she was able to speak intelligibly and walk unassisted by age 7), but otherwise behaved like a normal human. Are you seriously asking me to believe she’s a zombie? How do I know you’re conscious?
Exactly! You don’t! And all this talk of who is born without which brain region and how they went through life gets us no closer at all to actually understanding which physical systems are not zombies.
Don’t you agree that certain brain lesion definitely make you not conscious? I think identifying which region is indispensable is important.
If I had to guess human can be conscious without a cerebellum but not without basal ganglia fwiw
No, I wouldn’t agree that there are brain lesions that definitely makes you not conscious, I would certainly agree that something like complete brain death makes you less conscious, but we don’t have anything more precise than our vague intuitions born from N=1 subjective data to go by here. We have no idea which kinds of information processing actually lead to qualia. Is consciousness like mass and gravity? in that every tiny bit of the universe has it, and we only notice it when enough coalesces together? or is it more like a phase transition? with simple systems having exactly 0 consciousness, and it suddenly turning on at some level of complexity of computation? Or is the “complexity” even irrelevant, and consciousness refers to just very specific kinds of information processing? None of these questions can be resolved by looking at the behaviour of humans with brain damage, they require a full theory of how subjective feelings map onto physical systems.
Fine. Hard Problem. Maybe panpsychism. I’m not claiming anybody understands how consciousness works. I only object to the “absolutely no idea that this is the case, neither does anyone else.” Given the case I linked to above, we have more than sufficient Bayesian evidence (on balance) to believe that a person can be conscious without a cerebellum, and if that’s what you’re objecting to, I don’t believe you’re still arguing in good faith. If we were talking about the cortex instead, then I’d be with you, but we’re not. You are not allowed to claim everyone has literally zero knowledge given the state of the evidence. That’s just Bayes. You were surprised by the evidence. You should update, not double down.
I don’t like how it sounds but : i think you are missing a lot of biological facts about consciousness and that we’re not as clueless as you seem to think. I definitely recommend reading the book “consciousness and the brain” by stanislas dehaene which is basically a collection of facts onbthe topic.
Putting it a bit more mildly, that depends on what you mean by consciousness.
My other comment might be relevant here also