Questions & explanations
1. What is a potential problem with List's many-worlds theory of consciousness?
One problem is that it seems to multiply conscious selves beyond necessity. If every decision creates a new branch, there are infinitely many conscious beings, which might be implausible. Also, it is unclear how the branches are connected. If they are separate, then each self is isolated, so your experience is still linear from your perspective. The theory does not explain why you experience only one branch at a time. Another problem is that it relies on the many-worlds interpretation of quantum mechanics, which is controversial. Some physicists reject it. Additionally, the theory might lead to ethical issues: if all possibilities are real, then every harmful outcome also occurs, which could be seen as a reason to avoid certain actions. Overall, the theory is speculative and faces both empirical and philosophical challenges.
2. How does Parfit's reductionist view affect the way we think about moral responsibility?
If personal identity is not what matters, then moral responsibility might also be based on psychological connections rather than strict identity. For example, if a person commits a crime and later changes completely due to brain damage, common sense might say they are still the same person and thus responsible. Parfit might say that if the psychological connections are weak, the later person is not fully responsible. Similarly, if you make a promise, you should keep it because the future you is psychologically connected to you, not because you are identical. This view allows for degrees of responsibility. It also raises questions about punishment: if a criminal is no longer psychologically connected to their past self, should they be punished? Parfit's view suggests we might need to reconsider legal practices.
3. How does the vertiginous question relate to the problem of personal identity?
The vertiginous question challenges theories of personal identity because it asks why we have the particular perspective we do. If personal identity is about psychological continuity or a soul, the vertiginous question asks why that continuity or soul is attached to this specific perspective. It suggests that there is something inexplicable about being a particular self. Some philosophers think that the vertiginous question shows that personal identity cannot be fully explained by physical or psychological facts. It points to a mystery at the heart of selfhood. For example, even if we know all the facts about a person's brain and memories, we still don't know why that person experiences being themselves. So the vertiginous question may indicate that personal identity involves a primitive fact.
4. Give an example of a situation where Parfit would say survival occurs even though identity is lost.
Consider a brain transplant: your brain is removed from your body and placed into a new body. Common sense might say you survive because your brain (and hence your memories and personality) continues. Parfit agrees that this is survival because psychological continuity is maintained. Now consider a more extreme case: your brain is split into two halves, each transplanted into a different body, creating two people who both have your memories. Neither is identical to the original you, but both are psychologically connected. Parfit says that you survive as both, even though identity is lost. So survival is not about being the same person; it is about the continuation of mental life. This example shows how Parfit's view changes our understanding of personal identity.
5. What might be a possible response to the vertiginous question?
One possible response is to say that the vertiginous question is based on a mistake. Some philosophers argue that there is no deep fact about why you are you; it is just a tautology that you are you. The question 'Why am I me?' might be ill-formed because 'I' refers to the person asking, so it is trivial. Another response is to accept that the question has no answer and that this is just a feature of consciousness. Hellie himself seems to think the vertiginous question reveals a fundamental mystery that we cannot resolve. A third response is to appeal to panpsychism, the view that consciousness is everywhere, so every perspective exists, and the question of why this one is yours dissolves. However, none of these responses fully satisfy the sense of dizziness.
6. Compare List's many-worlds theory with the common view that we have a single future.
The common view is that you have one future, and your choices determine which one happens. You are a single person who experiences a linear timeline. List's theory says that all possible futures happen, and you are many persons experiencing each. In the common view, if you choose tea, you do not experience coffee. In List's view, you experience both because the world splits. The common view assumes that identity is unique and continuous. List's view denies that; identity is branching and multiple. This difference affects how we think about regret: in the common view, you might regret not choosing coffee. In List's view, there is no regret because the coffee version exists. So List's theory offers a different perspective on decision-making and selfhood.
7. Explain the difference between the easy problems and the hard problem of consciousness.
The easy problems of consciousness are those that can be solved by explaining how the brain performs functions like attention, memory, and decision-making. For example, explaining how we integrate sensory information is an easy problem. The hard problem is explaining why these functions are accompanied by subjective experience. For instance, we can explain how the brain discriminates colors, but not why there is a feeling of redness. Easy problems are about mechanisms; the hard problem is about experience. Chalmers argues that even if we solve all easy problems, the hard problem remains. This distinction is important because it shows that consciousness is not just a functional property; it has a qualitative aspect that resists scientific explanation.
8. Why does Parfit think that personal identity is not what matters?
Parfit argues that personal identity is not what matters because it is not a deep, further fact. He uses thought experiments like fission to show that identity can be indeterminate or lost while what we care about—our memories, personality, and projects—continues. For instance, if you split into two people, neither is identical to you, but both have your psychological traits. If identity were what mattered, you would be upset that you are gone. But Parfit thinks you should be happy that your psychological life continues in two branches. He also points out that in ordinary life, we care about our future experiences being connected to our present self, not about being the exact same person. So identity is just a convention, not the core of survival.
9. Explain how Parfit's view relates to the idea of 'survival' in cases of gradual change, like aging.
In ordinary aging, you change gradually—you lose some memories, gain new ones, your personality shifts. Common sense says you are the same person throughout. Parfit agrees that you survive because psychological continuity is maintained step by step, even though the connections between your young self and old self might be weak. He calls this 'psychological continuity'—a chain of overlapping connections. So even if your old self is very different from your young self, as long as there is a chain of direct connections, you survive. This shows that survival does not require strong connections all the way back; it only requires a continuous chain. Parfit's view thus matches common sense in gradual cases but differs in sudden changes like fission.
10. How does the indexical 'I' relate to personal identity?
The indexical 'I' is central to personal identity because it expresses self-awareness. When you think 'I am the same person as yesterday', you are using 'I' to refer to yourself across time. This use of 'I' assumes that there is a single subject of experience. Some philosophers argue that the meaning of 'I' is not just a label but reveals a special kind of knowledge—knowledge of oneself as a subject. For personal identity, the fact that we use 'I' to refer to ourselves suggests that we have a sense of being a continuous self. However, indexicals also raise puzzles: if a person with amnesia says 'I don't know who I am', the 'I' still refers to them, even though they lack self-knowledge. So 'I' seems to refer to something deeper than memories.
11. How does the hard problem challenge the idea that personal identity is based on brain continuity?
If the hard problem shows that consciousness is not just brain activity, then personal identity might not be fully explained by brain continuity. For example, if you could copy your brain states to a computer, the computer might behave like you, but would it have consciousness? If not, then your identity would not transfer. The hard problem suggests that there is an extra ingredient—subjective experience—that is not captured by physical duplication. So brain continuity alone might not guarantee survival of the self. This challenges reductionist views like Parfit's, which assume that psychological continuity is enough. It raises the possibility that identity requires the continuation of the same consciousness, which may be non-physical.
12. How does the use of 'I' differ from using a name or description to refer to oneself?
Using 'I' is direct and does not rely on any description. If you say 'I am tired', you refer to yourself without needing to know your name or any properties. In contrast, using a name like 'John' or a description like 'the person in the mirror' requires you to know that you are John or that the person in the mirror is you. For example, if you have amnesia and forget your name, you can still say 'I am tired' correctly. But you cannot say 'John is tired' unless you know you are John. So 'I' is more fundamental for self-awareness. This difference is important for personal identity because it shows that self-reference is immediate and not based on identifying criteria. It suggests that the self is known directly through the use of 'I'.