Identity and Change in Conscious Beings
The problem of personal identity relates to change as applied to people. The molecules that make up each individual change almost completely over a period of years. Usually, there is no trouble in saying that a little girl in 1920, for example, is the same as an old woman in 1998, even though they share a relatively small number of molecules in common. The same person is just described in two different ways, first as a little girl, and second, as an old woman. In fact, we are confident enough of our ability to reidentify people over time that we are given names that are supposed to last us from when we get them until we die many years later. The question is exactly why we call the old woman in 1998 the same person as that little girl in 1920.
However, according to quantum physics, individual molecules (and atoms, electrons, protons etc.) have no identity. For example, every electron is the same and in quantum mechanics, one can not keep track of an individual electron precisely. Therefore any electron can interchange with another one with no observable physical change of the system at all. Thus, any real object cannot remain the same, also because of movement of its physical parts (even much bigger than molecules). Similarly to Leibniz solution, in a real life, we can say the person (or any macroscopic object) is the same, because all signs refer to the person (or object) in the past, which evolved in time.
Read more about this topic: Identity And Change
Famous quotes containing the words identity, change, conscious and/or beings:
“There is a terrible blindness in the love that wants only to accommodate. It’s not only to do with omissions and half-truths. It implants a lack of being in the speaker and robs the self of an identity without which it is impossible for one to grow close to another.”
—Alexander Theroux (b. 1940)
“Every generation rewrites the past. In easy times history is more or less of an ornamental art, but in times of danger we are driven to the written record by a pressing need to find answers to the riddles of today.... In times of change and danger when there is a quicksand of fear under men’s reasoning, a sense of continuity with generations gone before can stretch like a lifeline across the scary present and get us past that idiot delusion of the exceptional Now that blocks good thinking.”
—John Dos Passos (1896–1970)
“fundamentally an organism has conscious mental states if and only if there is something that it is like to be that organism—something it is like for the organism.”
—Thomas Nagel (b. 1938)
“It is at once the most overwhelmingly frustrating and exasperating task and the most joyous and rewarding experience to make human beings out of children.”
—Neil Kurshan (20th century)