Computational modelling of the effects of semantic dementia on visual word recognition

Cognitive Neuropsychology
M ColtheartJeremy J Tree

Abstract

Rogers, Lambon Ralph, Hodges, and Patterson (2004) studied two-alternative forced-choice visual lexical decision performance in patients with semantic dementia. With item pairs where the target word was more "typical" (i.e., higher in bigram and trigram frequency) than the foil (all foils were pseudohomophones), lexical decision performance was good and was unaffected by word frequency. With item pairs where the target word was less "typical" (i.e., lower in bigram and trigram frequency) than the foil, lexical decision performance was worse and was affected by word frequency, being particularly inaccurate when the word targets were low in frequency. We show (using as materials all the monosyllabic items used by Rogers and colleagues) that the same pattern of results occurs in the lexical decision performance of the DRC (dual-route cascaded) computational model of reading when the model is lesioned by probabilistic deletion of low-frequency words from its orthographic lexicon. We consider that the PDP (parallel distributed processing) computational model of reading used by Woollams, Plaut, Lambon Ralph, and Patterson (2007) to simulate reading in semantic dementia is not capable of simulating this lexical decision result. We tak...Continue Reading

References

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Sep 1, 2005·Cognitive Neuropsychology·Angela M BlazelyBarney J Casey
Jan 1, 2006·Cognitive Neuropsychology·Max Coltheart

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Citations

Jul 15, 2011·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Tobias Bormann, Cornelius Weiller
Oct 27, 2016·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Jean-Sebastien ProvostMaximiliano A Wilson

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