K. Camilleri wrote a very long paper about 'Constructing the Myth of the 
Copenhagen Interpretation'. But there are many **different** versions on-line.

https://philpapers.org/rec/CAMCTM

https://tinyurl.com/y9a9odek

He points out that the subjectivist view of the role of the observer 
(consciousness)  is a 'misconception' of the Copenhagen Interpretation.

'Although Heisenberg did sometimes speak of a subjective element in quantum 
physics, this should not be taken to mean that the consciousness of the 
‘observer’ plays a crucial roe lint eh measurement interaction. In Physics and 
Philosophy in 1958, Heisenberg argued that “the transition from the ‘possible’ 
to the ‘actual’ takes place during the act of observation” but this transition 
occurs “applies to the physical, not the psychical act of observation”. Only 
once the “interaction of the object with the measuring device” has taken place 
can we speak of the actualization, but here he was careful to point out that 
“it is not connected with the act of registration of the result, by the mind of 
observer” (Heisenberg, 1958, p. 54).'

'So where did this view come from? And how did this view come to be associated 
with the likes of Bohr and Heisenberg? Scholars have often traced this view to 
von Neumann’s analysis of measurement in his Mathematische Grundlagen der 
Quantenmechanik published in 1932 (von Neumann, 1955). Whereas in Bohr’s 
complementarity, the measurement device is described using the concepts of 
classical physics, and not according to the laws of quantum mechanics, in von 
Neumann’s presentation, the measurement device is given a quantum-mechanical 
treatment (Bub, 1995). According to von Neumann’s formal treatment of the 
problem, when we observe a quantum system, there is an instantaneous change of 
the wave function in Hilbert space – it collapses – a process which is not 
described by the Schrödinger equation. Precisely what von Neumann’s 
philosophical views on this matter were is more difficult to judge, though as 
Becker and Gavroglou have observed there is no evidence of him endorsing a 
realist view of the wave function, nor does he make any explicit reference to 
the need to introduce the consciousness of the observer in the measuring chain 
(Becker, 2004; Gavroglou, 1995, p. 171).Rather it was the 1939 monograph La 
Théorie de l’Observation en Méchanique Quantique by London and Bauer which we 
find the first explicit mention of the claim that the reduction of the wave 
function was the result of the conscious activity of the human mind (French, 
2002).'

etc etc

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