NDLI: Examination of the double-deficit hypothesis with adolescents and young adults with dyslexia

Content Provider	Springer Nature Link
Author	Nelson, Jason M.
Copyright Year	2015
Abstract	The double-deficit hypothesis (DDH) of the developmental dyslexias (Wolf and Bowers, Journal of Educational Psychology, 91, 415–438, 1999) was investigated with 149 adolescents and young adults (age range = 16 to 24 years) with dyslexia. Confirmatory factor analysis indicated that a two-factor model with separate naming speed (NS) and phonological awareness (PA) constructs was superior to a one-factor model, supporting the assumption within the DDH that NS is a source of reading dysfunction separable from PA. Hierarchical multiple regression analyses resulted in findings that were only partially supportive of the DDH. NS was predictive of word reading, spelling, and reading fluency beyond PA and verbal intellectual ability, but not pseudoword reading and timed and untimed reading comprehension. Examination of DDH subtypes did not support the core assumption of the DDH that the double-deficit subtype would have more impaired reading skills than both of the single-deficit subtypes. The NS deficit subtype was found to be more prevalent than the double-deficit and PA deficit subtypes within the subgroup of dyslexics with impairment in reading fluency. Overall results provided mixed support for the DDH and pointed to the need for the inclusion of additional abilities within theories of the underlying mechanisms disrupted in dyslexia.
Starting Page	159
Ending Page	177
Page Count	19
File Format	PDF
ISSN	07369387
Journal	Annals of Dyslexia
Volume Number	65
Issue Number	3
e-ISSN	19347243
Language	English
Publisher	Springer US
Publisher Date	2015-05-16
Publisher Institution	The International Dyslexia Association
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Adult Double-deficit hypothesis Dyslexia Naming speed Phonological awareness Rapid automatized naming Languages and Literature Psycholinguistics Education (general) Neurology Interdisciplinary Studies
Content Type	Text
Resource Type	Article
Subject	Education Speech and Hearing

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