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  • Title: Mental additions and verbal-domain interference in children with developmental dyscalculia.
    Author: Mammarella IC, Caviola S, Cornoldi C, Lucangeli D.
    Journal: Res Dev Disabil; 2013 Sep; 34(9):2845-55. PubMed ID: 23810925.
    Abstract:
    This study examined the involvement of verbal and visuo-spatial domains in solving addition problems with carrying in a sample of children diagnosed with developmental dyscalculia (DD) divided into two groups: (i) those with DD alone and (ii) those with DD and dyslexia. Age and stage matched typically developing (TD) children were also studied. The addition problems were presented horizontally or vertically and associated with verbal or visuo-spatial information. Study results showed that DD children's performance on mental calculation tasks was more impaired when they tackled horizontally presented addition problems compared to vertically presented ones that are associated to verbal domain involvement. The performance pattern in the two DD groups was found to be similar. The theoretical, clinical and educational implications of these findings are discussed.
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