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Published on: October 12, 2010
Reading disability subtypes and the test of memory and learning.
N L Howes1, E D Bigler, J S Lawson
1Department of Psychology, Brigham Young University, Provo, UT 84602, USA.
Summary
Children with dyslexia, both dysphonetic and dyseidetic, show lower memory scores, particularly in auditory sequential memory. Distinct subtypes of dyslexia exist, impacting reading abilities.
Area of Science:
- Neuroscience
- Developmental Psychology
- Educational Psychology
Background:
- Dyslexia is a common learning disability affecting reading.
- Previous research suggests potential subtypes of dyslexia.
- Memory deficits are often associated with reading difficulties.
Purpose of the Study:
- To investigate memory performance in children with different types of dyslexia.
- To identify distinct subtypes of reading disabilities using memory profiles.
Main Methods:
- Study 1: Compared Composite Memory Index (CMI) scores from the Test of Memory and Learning (TOMAL) in children with dysphonetic dyslexia, dyseidetic dyslexia, and control groups.
- Study 2: Utilized average linkage cluster analysis on TOMAL subtest principal components to identify reader clusters.
Main Results:
- Children with dyslexia exhibited significantly lower CMI scores compared to controls.
- Both dysphonetic and dyseidetic dyslexia groups showed auditory sequential memory impairments.
- Cluster analysis revealed homogeneous groups of normal readers and children with reading disabilities, suggesting distinct subtypes.
Conclusions:
- Qualitatively distinct subtypes of readers with dyslexia exist.
- Auditory sequential memory is a key area of impairment in dyslexia.
- Memory profiles can help differentiate subtypes of reading disabilities.
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