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Big Bang/McGinn: we assume that there was eventually a singularity that resulted in space and matter. The fact that this singularity arose at some point is based on properties of the universe that already existed before.
Originally pre-spatial properties (before the Big Bang) would therefore (assuming physical preservation) be the cause both of matter and of mind.
Consciousness/Big Bang/McGinn: Thesis: consciousness is sort of a fossil of the early universe (before the Big Bang). It must entail reminiscences of those far past times.
Die Grenzen vernünftigen Fragens Stuttgart 1996
Wie kommt der Geist in die Materie? München 2001