If consciousness (the mind) can exist independently of physical reality (the brain), one must explain how physical memories are created concerning consciousness. Dualism must therefore explain how consciousness affects physical reality. One possible explanation is that of a miracle, proposed by Arnold Geulincx and Nicholas Malebranche, where all mind-body interactions require the direct intervention of God. Another possible explanation has been proposed by C. S. Lewis. Although at the time Lewis wrote Miracles [25], Quantum Mechanics (and physical indeterminism) was only in the initial stages of acceptance, he stated the logical possibility that if the physical world was proved to be indeterministic this would provide an entry (interaction) point into the traditionally viewed closed system, where a scientifically described physically probable/improbable event could be philosophically described as an action of a non physical entity on physical reality.

The zombie argument is based on a thought experiment proposed by David Chalmers. The basic idea is that one can imagine, and therefore conceive the existence of, one's body without any conscious states being associated with it. Chalmers' argument is that it seems very plausible that such a being could exist because all that is needed is that all and only the things that the physical sciences describe about a zombie must be true of it. Since none of the concepts involved in these sciences make reference to consciousness or other mental phenomena, and any physical entity can be by definition described scientifically via physics, the move from conceivability to possibility is not such a large one.[26] Others such as Dennett have argued that the notion of a philosophical zombie is an incoherent [27], or unlikely [28], concept. Formally, under physicalism, one must either believe that anyone including oneself might be a zombie, or that no one can be a zombie - this follows from the physicalist assertion that one's own conviction about being (or not being) a zombie is a product of the physical world and is therefore no different from anyone else's.

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  1. http://www.undeadreport.com/2007/11/2012-and-the-zombie-apocalypse/