The Computationalist Argument for Multiple Realizability
Thomas W. Polger · Oxford University Press eBooks · 2016
Many arguments for multiple realization begin with the claim that psychological states are computational states, and conclude the abstractness of computational states assures their multiple realizability. However, in many cases where a cognitive scientist offers a computational description of a cognitive capacity, on offer is merely a computational gloss that carries with it no commitment to the existence of an internal psychological organization that actually performs computations. Similarly, that the abstractness of computational descriptions entails the multiple realizability of psychological states runs into difficulty. Abstractness is a property of descriptions, not of the processes described. Hence, the abstract character of computational descriptions does little to support the claim that the processes they describe might be multiply realizable. Furthermore, one may insist that computational descriptions of psychological processes succeed because the processes themselves are computational, but this response neglects decades of research that challenges the computational nature of psychological processing.