Target/error overlap in jargonaphasia: the case for a one-source model, lexical and non-lexical summation, and the special status of correct responses

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Abstract

We present three jargonaphasic patients who made phonological errors in naming, repetition and reading. We analyse target/response overlap using statistical models to answer three questions: 1) Is there a single phonological source for errors or two sources, one for target-related errors and a separate source for abstruse errors? 2) Can correct responses be predicted by the same distribution used to predict errors or do they show a completion boost (CB)? 3) Is non-lexical and lexical information summed during reading and repetition? The answers were clear. 1) Abstruse errors did not require a separate distribution created by failure to access word forms. Abstruse and target-related errors were the endpoints of a single overlap distribution. 2) Correct responses required a special factor, e.g., a CB or lexical/phonological feedback, to preserve their integrity. 3) Reading and repetition required separate lexical and non-lexical contributions that were combined at output.

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Original languageEnglish
Pages (from-to)158-179
Number of pages22
JournalCortex
Volume73
Early online date26 Jul 2014
DOIs
StatePublished - Dec 2015

    Keywords

  • aphasia, computational models, jargonaphasia, speech production, summation hypothesis

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