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

@article{Rogers2004StructureAD,
  title={Structure and deterioration of semantic memory: a neuropsychological and computational investigation.},
  author={Timothy T. Rogers and Matthew. A. Lambon Ralph and Peter Garrard and Sasha Bozeat and James L. McClelland and John R. Hodges and Karalyn E Patterson},
  journal={Psychological review},
  year={2004},
  volume={111 1},
  pages={
          205-35
        }
}
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… 

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References

SHOWING 1-10 OF 133 REFERENCES

Conceptual Structure and the Structure of Concepts: A Distributed Account of Category-Specific Deficits

A new account of the fine-grained structure of semantic categories derived from neuropsychological, behavioral, and developmental data is presented, claiming that the distinctiveness of functional features correlated with perceptual features varies across semantic domains and that category structure emerges from the complex interaction of these variables.

Loss of semantic memory: implications for the modularity of mind

Abstract We report a patient, PP, with semantic dementia who was studied longitudinally over two years. During this period she showed a progressive and profound loss of semantic memory affecting

The Selective Impairment of Semantic Memory

  • E. Warrington
  • Psychology
    The Quarterly journal of experimental psychology
  • 1975
Evidence is presented that this impairment of semantic memory cannot be accounted for by intellectual impairment, sensory or perceptual deficits, or expressive language disorder, and some tentative evidence for the structural basis for a hierarchically organized modality-specific semantic memory system is discussed.

Systematicity and specialization in semantics

A distributed connectionist simulation is presented in which optic aphasia occurs following damage as a result of more graded representational specialization, raising the possibility that much of the structure of the lexical/semantic system can be derived from general learning principles and need not be assumed a priori.

No Right to Speak? The Relationship between Object Naming and Semantic Impairment:Neuropsychological Evidence and a Computational Model

It is proposed that semantic impairment alone can account for the full range of word production deficits described here, on the basis of both the neuropsychological and computational evidence.

Functional Neuroanatomy of the Semantic System: Divisible by What?

Results suggest that, within a distributed conceptual system activated by words, the more prominent neural distinction relates to type of attribute, as a function of attribute type.

Systematicity and Specialization in Semantics: A Computational Account of Optic Aphasia

This work accounts for the critical aspects of optic aphasia in terms of the effects of damage to a parallel distributed processing system that maps between multiple input and output modalities and shows that the robustness of a task in such a system depends critically on its systematicity, and that modality-specific naming deficits can arise because naming is an unsystematic task.

Constraining claims about theories of semantic memory: More on unitary versus multiple semantics

Abstract In Caramazza, Hillis, Rapp, and Romani (1990) we proposed that the various patterns of impaired performance that have been used to motivate proposals of modality-specific semantics can,

Graded modality-specific specialisation in semantics: A computational account of optic aphasia

  • D. Plaut
  • Psychology
    Cognitive neuropsychology
  • 2002
The ability of the model to account for the pattern of performance observed in optic aphasia across the full range of severity of impairment provides support for the claim that semantic representations exhibit graded functional specialisation rather than being entirely amodal or modality-specific.

Connectionist Perspectives on Category-Specific Deficits

Theories of semantic memory tend between two poles. At one extreme is a view often associated with the connectionist enterprise: that the semantic system is a unitary, homogeneous mass, without
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