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Remediating the core deficits of developmental reading disability: a double-deficit perspective
M W Lovett1, K A Steinbach, J C Frijters
1Brain and Behaviour Program, Hospital for Sick Children, Toronto, Ontario, Canada. mwl@sickkids.on.ca
Journal of Learning Disabilities
|October 21, 2004
Summary
Children with reading disabilities often have deficits in phonological awareness and visual naming speed. Targeted interventions show significant reading gains for all subgroups, with specific programs yielding better results for certain reading challenges.
Area of Science:
- Developmental Psychology
- Educational Psychology
- Neuroscience
Background:
- The double-deficit hypothesis proposes that deficits in phonological awareness and visual naming speed independently impede reading acquisition in children with developmental reading disabilities (RD).
- Understanding these distinct and combined deficits is crucial for effective reading intervention strategies.
- Previous research has established the significance of phonological processing and rapid automatized naming (RAN) in reading development.
Purpose of the Study:
- To classify children with severe RD into subgroups based on the double-deficit framework.
- To investigate the impact of phonological awareness and visual naming speed deficits on reading acquisition.
- To evaluate the effectiveness of different reading intervention programs on improving word identification and generalization.
Main Methods:
- One hundred sixty-six children (7–13 years) with severe RD were assessed and classified into phonological deficit, visual-naming speed deficit, or double-deficit subgroups.
- Children received 35 hours of either a metacognitive phonics program or a phonological training program.
- Reading performance, including word identification and generalization, was measured before and after intervention.
Main Results:
- Of 140 classified children, 54% had a double deficit, 22% had a phonological deficit only, and 24% had a visual-naming speed deficit only.
- The double-deficit group exhibited more global impairments, while the visual-naming speed deficit group showed the highest achievement.
- All subgroups demonstrated significant gains after word identification training, with notable generalization effects.
- A metacognitive phonics program enhanced generalization to real words, while phonological training improved phonological processing. Children with only phonological deficits showed the greatest non-word reading gains.
Conclusions:
- The double-deficit hypothesis effectively categorizes children with RD, highlighting the distinct and combined roles of phonological and visual-naming speed deficits.
- Both phonological and visual-naming speed deficits contribute significantly to reading difficulties.
- Tailored intervention approaches, such as metacognitive phonics or phonological training, can lead to significant improvements in reading skills for children with RD, with specific benefits depending on the deficit profile.