Abortion - Why are people pro life? Here is a thought experiment - I do not think it is mine, but I cannot remember whose it is - that seems to imply something important about the nature of the self or mind.
I should say, in my limited experience most people seem to start out with a view about what the self is and then just stick to it, rather than trying to extract the implications of our intuitions about cases. I take it to be obvious that this is a wrong-headed approach as, by hypothesis, we are trying to find out what kind of an entity the mind is and so shouldn't start out thinking we already know.
Imagine there's a machine made by someone famous. Turing, say. As such it is worth a fortune. Imagine we start the machine working. And now imagine that, without interrupting its functioning, we start gradually replacing its parts (the machine has some redundancy built in, so this is possible - that is, we can remove individual parts without stopping it working, so long as we do so bit by bit, replacing them as we go).
Eventually all the parts have been replaced. There is still a functioning machine there. All the parts that were removed were then reassembled. So now there are two machines side by side, and one of them is functioning away and has never ceased functioning.
There's an auction coming up. Which of the two machines is worth a fortune? The second one, obviously. The one that is made of the parts crafted by Turing. So, not the machine that's functioning, but the one beside it.
What can we conclude? That the 'valuable' machine is the one made of the parts that Turing crafted. That's why the value tracks the bits, not the functioning.
Applied to brains and minds, if our minds are our brains, then minds track brain matter. And that would mean that if we engaged in the same procedure as that outlined above - so gradually removed parts of a brain without interrupting its functioning and reassembled them beside it, so that eventually we have two brains - then it would be the reaassmbled brain that would be the mind that was previouisly in the position of the functioning mind.
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.
I don't know about you, but my reason represents - and represents very clearly - the original brain whose functioning has not been interrupted to remain the bearer of the mind. That seems to me to imply that my mind tracks my consciousness, not the matter of my brain.
But it also seems clear that whether consciousness is interrupted or not also makes no difference, for it seems counter-intuitive to suppose that if there was an interruption the mind would suddenly go with the material of the brain and not stay where it is.
In that case, this seems to imply that my mind is not the matter of my brain, nor is it my consciousness, but is instead something that (sometimes) has consciousness
I don't really see how this illuminates the abortion issue, however, as whatever the mind is - whether material or immaterial - the question of whether the fetus has one remains.
It's not as if belief in the soul commits one to thinking that the soul is in the fetus from the moment of conception, or at any other point, up to and including birth.
This is something that puzzles me over the abortion debate. Those on the 'soul' side seem to think they're somehow committed to thinking the fetus is a person....why? Whatever kind of a thing the mind is, this doesn't seem to me to shed light on the morality of abortion...