Why do you lose memories when you teleport and why do you posit that I have a continuous memory from birth to now? — Hanover
Please forgive any prickliness here. It seems, outright, you are not reading my entire posts. Eg, the above vs:
You're free to say you were not 'you' before, say, age 4 when clear memories coalesced. — AmadeusD
So, to be clear, I can;t answer your question because I did not make the claim it refers to. I will do my best to ignore this, as it comes up, and just respond to what I can stand behind. So, apologies if things seemed to be missed and such.
You're distinguishing your example from mine — Hanover
By the fact that, in 'my' (it's actually Derek Parfit) case, you choose to use a machine which purports to "recreate" you somewhere else. But what actually happens, is that you go into a machine, it copies you perfectly - atom for atom - then destroys you and sends the data to another machine which 3d-prints you from that data. This is
clearly not like your case of simply living through life, even if this reduces to saying they're are just different cases.
Ignoring the question of whether this would preserve psychological continuity (relation R) at all (reductionists are essentially committed to saying yes, it would, by virtue of being your
exact physical double at the moment of transfer) and the question of how, moments after re-creation, you couldn't be the original person as your memories now diverge sufficiently to defeat the rule of identity, the point is this:
If there is someone who recalls being you, and is physically identical do you - is this you? The reason this is an important thing to nail down about identity is presented in:
the kicker for this thought experiment is what's called the 'branch-line case" in which the machine malfunctions, and you survive several hours after the transfer and can talk to your double. You are, though, destined to die in the 'normal' way, in several hours time.
Can there be two "you"s? Uncomfortable. But seems fairly true, if relation R holds. You may simply disagree that this is the correct notion of identity and that's totally fine. I've just not come across a better one, however much this has increased my fear of death.
But if I go from Point A to Point B over 50 years and not a single same cell or single same memory exists from age 1 to age 50, then don't I have the same identity problem as you noted in the teleporting? — Hanover
I think the underlined is not quite right. This might be rectified by moving the date forward to age 4, per the above correction I've made to your initial questions. But that said, in your example - not a single cell, and not a single memory remain? You are not the same person. That seems simple. It relies on the same logic/reasoning/position as the teletransporter case. That case is simply the reverse. Can someone who
does have the exact physical make-up, and psychological make-up
as you.. actually
be you? It seems they can. And, for me, the only issue is how to get around the possibility of two "you"s. For me, this is solved by the fact that the exact instant one becomes aware they did not die in the machine, the two have disparate memory banks. Nothing ship-of-theseus rears its head.
Here is a thought experiment - I do not think it is mine, but I cannot remember whose it is — Clearbury
Parfit outlines several versions of this in Reasons and Persons as related to humans. He uses surgeries replacing body parts, and swapping body parts to tease out the intuitions. Far too long to summarize, but that may be helpful in you find the discussion. DM me if you need further help on that...
On the other hand, if the mind stays with the functioning, then the mind stays where it is and the reassembled brain is either just a lump of meat or another mind, but it isn't the original one. — Clearbury
This is a conclusion for a different thought experiment, on my view. Yours speaks to "at what point" certain things become, or are disestablished. The whole-sale transference of matter in the sense of "Reassembling" is not the same question, I don't think. However, I think when you turn this to brains and minds, we don't know enough about functional memory and where/what in the brain houses/contributes to/eliminates memories to justly answer whether or not the "old, reassembled" brain would carry
any memories with it.