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.
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Famous quotes containing the words identity, change, conscious and/or beings:
“The “female culture” has shifted more rapidly than the “male culture”; the image of the go-get ‘em woman has yet to be fully matched by the image of the let’s take-care-of-the-kids- together man. More important, over the last thirty years, men’s underlying feelings about taking responsibility at home have changed much less than women’s feelings have changed about forging some kind of identity at work.”
—Arlie Hochschild (20th century)
“I change my opinions often, but not my way of thinking.”
—Mason Cooley (b. 1927)
“How oft upon yon eminence our pace
Has slackened to a pause, and we have borne
The ruffling wind, scarce conscious that it blew,
While admiration, feeding at the eye,
And still unsated, dwelt upon the scene.”
—William Cowper (1731–1800)
“The 5307th has collapsed. From a medical viewpoint, they’re finished as a fighting unit.... I have never seen human beings in such condition. They’re drained, physically and psychologically drained. I’m not tagging them for specific ailments. I’m simply marking every man in the outfit A.O.E.—accumulation of everything.”
—Samuel Fuller, U.S. screenwriter, and Milton Sperling. Samuel Fuller. Doc (Andrew Duggan)