title: Target/error overlap in jargonaphasia: The case for a one-source model, lexical and non-lexical summation, and the special status of correct responses.
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.
authors.affiliation: School of Psychology, University of Birmingham, UK. Electronic address: olsonac@bham.ac.uk.
authors.forename: Andrew
authors.initials: A
authors.lastname: Olson
authors.affiliation: School of Psychology, University of Birmingham, UK.
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Halloran
authors.affiliation: School of Life & Health Sciences, Aston University, UK.
authors.forename: Cristina
authors.initials: C
authors.lastname: Romani
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001037:Aphasia / Q000175:diagnosis / Q000503:physiopathology*; D003198:Computer Simulation; D005260:Female; D006801:Humans; D008297:Male; D010700:Phonetics; D011932:Reading; D012660:Semantics; D013060:Speech / Q000502:physiology*; D013647:Task Performance and Analysis
keywords: Aphasia; Computational models; Jargonaphasia; Speech production; Summation hypothesis