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- Temporal displacement is experienced around the border of the island (such as Desmond in the helicopter and crew members of the Kahana) because there is a kind of time rift surrounding the island in a shell-like dome. The island is known to move through time on a semi-frequent basis and this movement has caused the outer limits of the island to become warped and misplaced. Anyone passing through the fringes of such rift are subject to any residual time traveling properties, and thusly undergo temporal displacement.
- Most cases of the temporal displacement "disease" are actually caused by being in close proximity to one's own self in another time stream. Thus, the paradox of meeting your future self is resolved by one or both of you dying before you meet. This is why Daniel notices that the severity of symptoms is directly related to one's time spent on the island; more time means more chances of you being near your time-double. Charlotte claims to not have had nosebleeds since she was a child; her adult self may have time-traveled to her childhood several times during the flashes and caused nosebleeds for both selves. Charlotte's death also occurred shortly before she would have been permanently stuck in 1974 and would have certainly met her young self. Sawyer and Juliet get nosebleeds shortly after traveling to Season One where Sawyer sees Kate and Claire. This theory may be negated if Pierre Chang's son turns out to be Miles, although it could potentially explain (or be explained by) Miles' "death sense".
- Traveling to/from the island on the wrong vector causes a person to shift slightly forward/backward in time, the severity of which is somewhat related to how far off course you are. Minkowski and others were very far off course, which damaged their psyches and eventually killed them. Desmond was only slightly off course during the helicopter ride, and was able to find a constant and "get back."