Efficacy of neuropsychological rehabilitation on numerical and calculation abilities: A developmental case study.

Present single case proves the effectiveness of a theory-based cognitive treatment on numerical and calculation abilities in developmental age. Both evaluation and treatment were designed on the bases of current models of numerical cognition, in particular Von Aster's developmental model. At the age of 7.4 years, HT was referred for a serious delay in the acquisition of numerical skills involving all numerical and calculation skills (written calculations, numerical knowledge, accuracy, rapidity). Following the rules of neuropsychological rehabilitation, HT was submitted to an early, intensive, HT-tailored treatment based on analogic representation of amount. After 12 months of treatment, HT showed statistically significant increasing in all the investigated variables: however, even if he correctly performed various numerical tasks, he remained significantly slower compared to his peers. Present case demonstrated the efficacy of theory-based, individually-tailored developmental dyscalculia. Early diagnosis and early intervention are urgently needed to get clinically significant change and to prevent behavioral and emotional symptoms.