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Cerebral asymmetry in developmental dyslexia
Archives of Neurology
|November 1, 1981
Summary
Computed cranial tomograms (CCTs) in boys with developmental dyslexia revealed more symmetric occipital widths than expected. This finding suggests CCTs are not routinely warranted for dyslexia assessment without neurological signs.
Area of Science:
- Neuroscience
- Developmental Psychology
- Medical Imaging
Background:
- Developmental dyslexia is a common neurodevelopmental disorder affecting reading ability.
- Cranial asymmetries have been previously investigated as potential correlates of dyslexia.
- Computed cranial tomography (CCT) is a neuroimaging technique used to visualize brain structures.
Purpose of the Study:
- To investigate cranial width and length asymmetry in the frontal and occipital regions of boys with developmental dyslexia.
- To compare findings with previous research and established norms.
- To determine the utility of CCT in assessing developmental dyslexia.
Main Methods:
- Computed cranial tomograms (CCTs) of 26 dextral boys with developmental dyslexia were analyzed.
- Measurements focused on frontal and occipital region widths and lengths.
- Data were compared to control samples and existing normative data.
Main Results:
- No increased frequency of reversed occipital widths was observed, contrary to some prior studies.
- A higher proportion of symmetric occipital widths was found than expected.
- No significant relationships were found between CCT measurements, IQ differences, or language delay.
Conclusions:
- Cranial asymmetries, specifically occipital width symmetry, may be associated with developmental dyslexia.
- The findings challenge some previous assumptions about dyslexia-related cranial asymmetry.
- Routine CCT is not recommended for investigating developmental dyslexia unless other neurological abnormalities are present.