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Increased morphological variants in children with learning disabilities

C Cummings, D Flynn, M Preus

    Journal of Autism and Developmental Disorders
    |December 1, 1982
    PubMed
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    Children with learning disabilities show more "late" morphological variants, suggesting developmental disturbances occur later in prenatal development. This finding offers new insights into the causes of these complex conditions.

    Area of Science:

    • Developmental biology
    • Human genetics
    • Pediatric neurology

    Background:

    • Children with learning disabilities often exhibit more morphological anomalies than typically developing children.
    • These anomalies are hypothesized to stem from shared prenatal factors affecting both morphology and central nervous system development.
    • Previous assumptions placed the origin of these morphological variants within the first trimester of prenatal development.

    Purpose of the Study:

    • To investigate the timing of prenatal developmental disturbances that lead to morphological variants in children with learning disabilities.
    • To differentiate between early and late-occurring developmental events contributing to these variants.
    • To explore potential etiological factors for learning disabilities by analyzing morphological anomalies.

    Main Methods:

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    • Classification of morphological variants into "early" (likely first trimester) and "late" (potentially later, growth-related) categories.
    • Statistical analysis comparing the incidence of "early" and "late" variants in learning-disabled children.
    • Utilizing sensitive methods, such as dermal pattern analysis, to detect subtle developmental disturbances.

    Main Results:

    • An increase in both "early" and "late" morphological variants was observed in the learning-disabled group.
    • The increase in "late" variants was statistically significant, indicating a later developmental influence.
    • Sensitive methods for detecting "early" variants did not reveal significant disturbances in the learning-disabled cohort, unlike in controls with congenital heart disease.

    Conclusions:

    • Morphological variants associated with learning disabilities may arise later in prenatal development than previously assumed.
    • The findings suggest that altered growth or later developmental disruptions are more significantly linked to these variants.
    • This refined understanding of developmental timing may aid in identifying the etiology of heterogeneous learning disabilities.