When Does Less Yield More? The Impact of Severity upon Implicit Recognition in Pure Alexia

Autor/inn/en	Roberts, Daniel J.; Lambon Ralph, Matthew A.; Woollams, Anna M.
Titel	When Does Less Yield More? The Impact of Severity upon Implicit Recognition in Pure Alexia
Quelle	In: Neuropsychologia, 48 (2010) 9, S.2437-2446 (10 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0028-3932
DOI	10.1016/j.neuropsychologia.2010.04.002
Schlagwörter	Semantics; Reading Strategies; Identification; Patients; Word Recognition; Severity (of Disability); Classification; Case Studies; Reading Difficulties + Suchen Sie Ihr Suchwort? Semantik; Reading strategy; Leselernstufe; Lesetechnik; Identifikation; Identifizierung; Patient; Worterkennung; Schweregrad; Classification system; Klassifikation; Klassifikationssystem; Case study; Fallstudie; Case Study; Reading difficulty; Leseschwierigkeit
Abstract	Pure alexia (PA) is characterised by strong effects of word length on reading times and is sometimes accompanied by an overt letter-by-letter (LBL) reading strategy. Past studies have reported "implicit recognition" in some individual PA patients. This is a striking finding because such patients are able to perform semantic classification and lexical decision at above chance levels even when the exposure duration is short enough to prevent explicit identification. In an attempt to determine the prevalence of this "implicit recognition" effect, we assessed semantic categorisation and lexical decision performance using limited exposure durations in 10 PA cases. The majority of the patients showed above chance accuracy in semantic categorisation and lexical decision. Performance on the lexical decision test was influenced by frequency and imageability. In addition, we found that the extent to which patients showed evidence of "implicit recognition" in both tasks was inversely related to the severity of their reading disorder. This result is consistent with hypotheses which suggest that this effect does not constitute an implicit form of unique word identification but is a reflection of the degree of partial activation within the word recognition system. These results also go some way towards explaining the individual variation in the presence of this effect observed across previous case-study investigations in the literature. (Contains 6 figures and 4 tables.) (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10