Multiple realizability, in
philosophy of mind, is the thesis that the same mental property, state, or event can be implemented by different physical properties, states or events. The idea has its roots in the late 1960s and early 1970s when a number of philosophers, most prominently
Hilary Putnam and
Jerry Fodor, put it forth as an argument against
reductionist accounts of the relation between mental and physical kinds. In short, a theory of mind that includes multiple realizability allows for the existence of
strong AI. The original targets of these arguments were the
type-identity theory and
eliminative materialism. The same arguments from multiple realizability were also used to defend many versions of
functionalism, especially Machine state functionalism.
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