Working Memory in Portuguese Children With Developmental Dyslexia.
Octávio Moura1, Mário R Simões1, Marcelino Pereira1
1a Faculty of Psychology and Education Sciences, University of Coimbra , Coimbra , Portugal.
Applied Neuropsychology. Child
|October 16, 2014
Summary
Children with developmental dyslexia (DD) struggle with phonological loop (PL) and central executive (CE) working memory tasks. These working memory components are key indicators for identifying DD and predicting reading and spelling skills.
Area of Science:
- Cognitive Psychology
- Developmental Neuroscience
- Educational Psychology
Background:
- Developmental dyslexia (DD) is a common learning disorder affecting reading and spelling.
- Working memory (WM) is crucial for cognitive functions, including reading acquisition.
- Specific WM components may be differentially affected in children with DD.
Purpose of the Study:
- To investigate working memory (WM) performance in Portuguese children with and without developmental dyslexia (DD).
- To identify which WM components are most relevant for differentiating children with DD.
- To determine the predictive power of WM tasks for reading and spelling abilities in DD.
Main Methods:
- A comparative study involving 50 children with DD and 50 typical readers (TR), aged 8-12 years.
- Assessment of working memory using phonological loop (PL), central executive (CE), and visuospatial sketchpad (VSSP) tasks.
- Statistical analyses including receiver-operating characteristics (ROC) curve, binary logistic regression, and hierarchical linear regression.
Main Results:
- Children with DD showed significant deficits in phonological loop (PL) and central executive (CE) tasks compared to typical readers (TR).
- No significant differences were found in visuospatial sketchpad (VSSP) tasks between the groups.
- After accounting for PL, CE group differences diminished, suggesting PL's primary role.
- PL and CE tasks were identified as relevant for DD identification, while VSSP tasks were not.
- PL and CE (specifically Backward Digit Span) significantly predicted reading and spelling abilities.
Conclusions:
- Working memory, particularly the phonological loop and central executive components, plays a critical role in developmental dyslexia.
- Phonological loop and central executive tasks are valuable tools for identifying children with DD.
- These findings highlight potential targets for interventions aimed at improving reading and spelling outcomes in children with DD.
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