Semantic ambiguity and the failure of inhibition hypothesis as an explanation for reading errors in deep dyslexia

Effect of phonetic complexity on word reading and repetition in deep dyslexia

“…She was unable to successfully read aloud nonwords and her responses included no response, pseudohomophone and in some instances she responded with real words. More details regarding her performance on various reading and language tasks can be found in our other publications (Buchanan et al, 2003;Colangelo & Buchanan, 2005, 2006Colangelo et al, 2004;).…”

“…Many other models of deep dyslexia suggest multiple loci of damage in the reading system (Morton & Patterson, 1980;Plaut & Shallice, 1993). Alternatively, some researchers have proposed that selection impairment in the phonological output lexicon alone can account for various types of reading errors observed in deep dyslexia (Buchanan et al, 2003;Colangelo & Buchanan, 2005, 2006Colangelo, Buchanan, & Westbury, 2004;Katz & Lanzoni, 1992).…”

An investigation into early acquired dyslexia

“…This type of reading disorder is found almost exclusively as an acquired form observed in adolescents and adults (Siegel, 1985). Although deep dyslexia was once believed to be a semantic processing deficit, recent studies have revealed that deep dyslexics possess an intact semantic system, and semantic errors are likely associated with deficits in 'phonological output' rather than a semantic processing impairment (Colangelo & Buchanan, 2005;Colangelo, Buchanan, & Westbury, 2004). The Failure of Inhibition Theory outlined in these studies proposes that individuals with deep dyslexia are unable to inhibit the production of phonological and semantic errors when reading aloud.…”

“…The Failure of Inhibition Theory outlined in these studies proposes that individuals with deep dyslexia are unable to inhibit the production of phonological and semantic errors when reading aloud. Neuroanatomical studies of deep dyslexia directly implicate damage in and around the left temporal parietal region (Colangelo & Buchanan, 2005;Dickerson & Johnson, 2004;Southwood & Chatterjee, 1999). In brief, phonological dyslexia, surface dyslexia and deep dyslexia have diverse symptoms, with a notable overlap between deep and phonological dyslexia.…”

Semantic typicality effects in acquired dyslexia: Evidence for semantic impairment in deep dyslexia

“…This hypothesis is based primarily on data from a single case of deep dyslexia, patient JO, whose responses the authors interpret as intact implicit access to semantics, intact explicit access to semantics in the absence of production, and deficient explicit access in tasks requiring production (Colangelo & Buchanan, 2005, 2007). To test implicit access, JO completed a lexical decision task and performed within accuracy ranges of controls, leading the authors to conclude that implicit semantic processing was intact (Colangelo & Buchanan, 2005).…”