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Assessing Dyslexia at Six Year of Age
Published on: May 1, 2020
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Action representation deficits in adolescents with developmental dyslexia
Alice van de Walle de Ghelcke1, Xanthi Skoura2, Martin Gareth Edwards1
1Psychological Sciences Research Institute and Institute of Neuroscience, Université Catholique de Louvain, Louvain-la-Neuve, Belgium.
Journal of Neuropsychology
|August 21, 2020
Summary
Adolescents with developmental dyslexia (DD) show impaired internal action representation, impacting motor control and reading abilities. This suggests a sensorimotor basis for DD, affecting predictive movement capabilities.
Area of Science:
- Neuroscience
- Developmental Psychology
- Motor Control
Background:
- Developmental dyslexia (DD) is a common reading disorder with diverse cognitive and motor deficits.
- While sensorimotor control deficits are known, internal action representation in DD remains unexplored.
Purpose of the Study:
- To investigate internal action representation in adolescents with pure DD compared to typical readers.
- To explore the relationship between motor imagery, sensorimotor control, and reading abilities in DD.
Main Methods:
- Compared 18 adolescents with pure DD and 18 age-matched controls.
- Participants performed visually guided pointing tasks (actual and mental) under speed/accuracy constraints.
- Analyzed movement times and conformity to Fitts' law.
Main Results:
- Typical readers showed isochronous movement times for both actual and mental tasks, conforming to Fitts' law.
- Dyslexic participants exhibited different movement times between conditions, with only actual movements conforming to Fitts' law.
- Motor imagery quality correlated significantly with word reading abilities in dyslexic individuals.
Conclusions:
- Internal action representation is impaired in pure developmental dyslexia.
- Findings support a sensorimotor perspective of DD, highlighting deficits in predictive action control.
- Motor imagery quality is linked to reading proficiency in DD.
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