Multiple Realizability, Identity Theory, and the Gradual Reorganization Principle

Abstract

In the literature on multiple realizability and the identity theory, cases of neural plasticity have enjoyed a very limited role. The present article attempts to remedy this small influence by arguing that clinical and experimental evidence of quite extensive neural reorganization offers compelling support for the claim that psychological kinds are multiply realized in neurological kinds, thus undermining the identity theory. In particular, cases are presented where subjects with no measurable psychological deficits also have vast, though gradually received, neurological damage. Common objections and concerns are also discussed and rejected. 1 Introduction 2 The GRP, Serial Lesion Effect, and Multiple Realizability 2.1 A case study of the serial lesion effect 2.2 Evaluating the case study’s evidence for multiple realizability 3 The GRP More Generally 4 Objections to the GRP as Evidence for Multiple Realizability 4.1 Small plastic effects and neurological taxonomies 4.2 But do neural regions and locations even matter at all? 4.3 But are there not other options besides location? 5 Conclusion