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sub-atomic particles experience time as a spatial dimension.
stable, unidirectional flow of time is an emergent property of atomic particles, specifically the nucleus. the protons and neutrons (and antiparticles in antimatter) interact such a way, that the atom's directional flow through time remains stable and unidirectional. sub-atomic particles, which are not bound by this emergent property, can still move freely. they can move forward and backwards through time, and their pre-measurement vector will essentially be a seemingly random unknown value. the vibrations of the particles themselves oscillate forward and backwards in time, and they regularly interact with (and thus influence) particles within spatial time, just as they do with particles within the other 3 spatial dimensions.
when a quantum particle interacts with atomic matter, their spatial time becomes influenced and they are effectively "locked" into the action; since spatial time movement would require changing the rigid time flow of the atom, they are forced to remain time stable for that interaction. this causes the phenomenon known as wave function collapse; once the particle has been measured, it becomes locked, and can no longer change.
