Models of Impaired Lexical Access in Speech Production

Dan Foygel, Gary S. Dell

Research output: Contribution to journalArticlepeer-review


Two computational models of lexical access in aphasic speakers are compared. Both are derived from an interactive two-step theory of retrieval based on spreading activation. The weight-decay model (Dell et al., 1997) associates patients with deviant values of two parameters, global connection weight and global decay rate. The new semantic-phonological model characterizes patients by two different parameters, semantic weight and phonological weight. We provide a detailed analysis of the properties of both models and show that the semantic-phonological model is a serious competitor to the earlier model. Not only does it fit existing patient data as well as the weight-decay model does but it also has closer ties to other facts and theories in cognitive neuropsychology and psycholinguistics.

Original languageEnglish (US)
Pages (from-to)182-216
Number of pages35
JournalJournal of Memory and Language
Issue number2
StatePublished - Aug 2000

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Language and Linguistics
  • Experimental and Cognitive Psychology
  • Linguistics and Language
  • Artificial Intelligence


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