If they are put into an interferometer, someone who thinks the wavefunction has collapsed would think, while in the middle, that they have a 50⁄50 chance of coming out each arm, while an everettian will make choices as if they might deterministically come out of one arm (depending on the construction of the interferometer).
The difficulty of putting humans into interferometers us more or less why this doesn’t matter much. Though of course “pragmatism” shouldn’t stop us from applying occam’s razor.
If they are put into an interferometer, someone who thinks the wavefunction has collapsed would think, while in the middle, that they have a 50⁄50 chance of coming out each arm, while an everettian will make choices as if they might deterministically come out of one arm (depending on the construction of the interferometer).
The difficulty of putting humans into interferometers us more or less why this doesn’t matter much. Though of course “pragmatism” shouldn’t stop us from applying occam’s razor.