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      Structure and deterioration of semantic memory: a neuropsychological and computational investigation.

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          Abstract

          Wernicke (1900, as cited in G. H. Eggert, 1977) suggested that semantic knowledge arises from the interaction of perceptual representations of objects and words. The authors present a parallel distributed processing implementation of this theory, in which semantic representations emerge from mechanisms that acquire the mappings between visual representations of objects and their verbal descriptions. To test the theory, they trained the model to associate names, verbal descriptions, and visual representations of objects. When its inputs and outputs are constructed to capture aspects of structure apparent in attribute-norming experiments, the model provides an intuitive account of semantic task performance. The authors then used the model to understand the structure of impaired performance in patients with selective and progressive impairments of conceptual knowledge. Data from 4 well-known semantic tasks revealed consistent patterns that find a ready explanation in the model. The relationship between the model and related theories of semantic representation is discussed.

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          Author and article information

          Journal
          Psychol Rev
          Psychological review
          American Psychological Association (APA)
          0033-295X
          0033-295X
          Jan 2004
          : 111
          : 1
          Affiliations
          [1 ] Medical Research Council Cognition and Brain Sciences Unit, Cambridge, UK. tim.rogers@mrc-cbu.cam.ac.uk
          Article
          2004-10332-012
          10.1037/0033-295X.111.1.205
          14756594
          f5c349e9-5604-4f6f-a96d-1dc0dbff76fc

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