>A few quotes below to dualism from Max Velmans.

H. Kragh ("Dirac: a Scientific Biography", Cambridge U.P., 1990) reports
a 1927 discussion between Dirac, Heisenberg and Born, about what 
actually gives rise to the so called "collapse" (reduction of waves packet). 
Dirac said that it is 'Nature' that makes the choice (of measurement 
Born agreed.  Heisenberg however maintained that, behind the collapse, 
and the choice of which 'branch' the wavefunction would be followed, there 
was "the free-will of the human observer".

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