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Full Idea
There is the question of the identity of a person over or across time ('diachronic' personal identity), and there is also the question of what makes for personal identity at a time ('synchronic' personal identity).
Gist of Idea
Personal identity is a problem across time (diachronic) and at an instant (synchronic)
Source
E.J. Lowe (Locke on Human Understanding [1995], Ch.5)
Book Ref
Lowe,E.J.: 'Locke on Human Understanding' [Routledge 2004], p.103
A Reaction
This seems to me to be the first and most important distinction in the philosophy of personal identity, and they regularly get run together. Locke, for example, has an account of synchronic identity, which is often ignored. It applies to objects too.
7710 | Perception is a mode of belief-acquisition, and does not involve sensation [Lowe] |
7711 | Science requires a causal theory - perception of an object must be an experience caused by the object [Lowe] |
7712 | On substances, Leibniz emphasises unity, Spinoza independence, Locke relations to qualities [Lowe] |
7714 | Personal identity is a problem across time (diachronic) and at an instant (synchronic) [Lowe] |
7715 | Mentalese isn't a language, because it isn't conventional, or a means of public communication [Lowe] |
7722 | If meaning is mental pictures, explain "the cat (or dog!) is NOT on the mat" [Lowe] |
7720 | Two things can only resemble one another in some respect, and that may reintroduce a universal [Lowe] |