Biomaterial Database

Investigating the double-deficit hypothesis of developmental dyslexia in an orthography of intermediate depth. 2020

Octávio Moura, and Marcelino Pereira, and Joana Moreno, and Mário R Simões

Neuropsychological Assessment and Ageing Processes (NAAP) group from the Center for Research in Neuropsychology and Cognitive and Behavioral Intervention (CINEICC), University of Coimbra, Coimbra, Portugal. octaviomoura@gmail.com.

The present study aimed to investigate the double-deficit hypothesis (DDH) in an orthography of intermediate depth. Eighty-five European Portuguese-speaking children with developmental dyslexia, aged 7 to 12, were tested on measures of phonological awareness (PA), naming speed (NS), reading, and spelling. The results indicated that PA and NS were not significantly correlated, and that NS predicts reading fluency (but not reading accuracy and spelling) beyond what is accounted for by PA. Although the majority of the children with developmental dyslexia have double deficit (62.4%), some children have a single phonological deficit (24.7%) or a single NS deficit (8.2%). Children with a double deficit were not more impaired in reading fluency, reading accuracy, and spelling than both single-deficit subtypes. In conclusion, the findings of the present study are partially consistent with the DDH and provide evidence for the multifactorial model of developmental dyslexia. Implications of the DDH for an orthography of intermediate depth are emphasized.

UI	MeSH Term	Description	Entries
D007802	Language	A verbal or nonverbal means of communicating ideas or feelings.	Dialect,Dialects,Languages
D007807	Language Tests	Tests designed to assess language behavior and abilities. They include tests of vocabulary, comprehension, grammar and functional use of language, e.g., Development Sentence Scoring, Receptive-Expressive Emergent Language Scale, Parsons Language Sample, Utah Test of Language Development, Michigan Language Inventory and Verbal Language Development Scale, Illinois Test of Psycholinguistic Abilities, Northwestern Syntax Screening Test, Peabody Picture Vocabulary Test, Ammons Full-Range Picture Vocabulary Test, and Assessment of Children's Language Comprehension.	Language Comprehension Tests,Vocabulary Tests,Boston Diagnostic Aphasia Examination,Boston Naming Test,Comprehensive Aphasia Test,Multilingual Aphasia Examination,Language Test
D008297	Male		Males
D010700	Phonetics	The science or study of speech sounds and their production, transmission, and reception, and their analysis, classification, and transcription. (Random House Unabridged Dictionary, 2d ed)	Speech Sounds,Sound, Speech,Sounds, Speech,Speech Sound
D011174	Portugal	A country in southwestern Europe, bordering the North Atlantic Ocean, west of Spain. The capital is Lisbon.	Madeira Island,Portuguese Republic
D011932	Reading	Acquiring information from text.
D002648	Child	A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL.	Children
D004410	Dyslexia	A cognitive disorder characterized by an impaired ability to comprehend written and printed words or phrases despite intact vision. This condition may be developmental or acquired. Developmental dyslexia is marked by reading achievement that falls substantially below that expected given the individual's chronological age, measured intelligence, and age-appropriate education. The disturbance in reading significantly interferes with academic achievement or with activities of daily living that require reading skills. (From DSM-IV)	Alexia,Dyslexia, Developmental,Reading Disability, Developmental,Reading Disorder,Reading Disorder, Developmental,Developmental Reading Disorder,Word Blindness,Alexias,Blindness, Word,Blindnesses, Word,Developmental Dyslexia,Developmental Dyslexias,Developmental Reading Disabilities,Developmental Reading Disability,Developmental Reading Disorders,Disabilities, Developmental Reading,Disability, Developmental Reading,Disorder, Developmental Reading,Disorder, Reading,Disorders, Developmental Reading,Disorders, Reading,Dyslexias,Dyslexias, Developmental,Reading Disabilities, Developmental,Reading Disorders,Reading Disorders, Developmental,Word Blindnesses
D005260	Female		Females
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man