Developmental dyscalculia (18 résultats)

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Etat : New. pp. 82.

Etat : New. pp. 82.

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Lex. 8° (25-30 cm), kart. 27 S. Cover with average soiling, pages in very good condition. --- FMRI-studies are mostly based on a group study approach, either analyzing one group or comparing multiple groups, or on approaches that correlate brain activation with clinically relevant criteria or behavioral measures. In this study we investigate the potential of fMRI-techniques focusing on individual differences in brain activation within a test-retest reliability context. We employ a single-case analysis approach, which contrasts dyscalculic children with a control group of typically developing children. In a second step, a support-vector machine analysis and cluster analysis techniques served to investigate similarities in multivariate brain activation patterns. Children were confronted with a non-symbolic number comparison and a non-symbolic exact calculation task during fMRI acquisition. Conventional second level group comparison analysis only showed small differences around the angular gyrus bilaterally and the left parieto-occipital sulcus. Analyses based on single-case statistical procedures revealed that developmental dyscalculia is characterized by individual differences predominantly in visual processing areas. Dyscalculic children seemed to compensate for relative under-activation in the primary visual cortex through an upregulation in higher visual areas. However, overlap in deviant activation was low for the dyscalculic children, indicating that developmental dyscalculia is a disorder characterized by heterogeneous brain activation differences. Using support vector machine analysis and cluster analysis, we tried to group dyscalculic and typically developing children according to brain activation. Fronto-parietal systems seem to qualify for a distinction between the two groups. However, this was only effective when reliable brain activations of both tasks were employed simultaneously. Results suggest that deficits in number representation in the visual-parietal cortex get compensated for through finger related aspects of number representation in fronto-parietal cortex. We conclude that dyscalculic children show large individual differences in brain activation patterns. Nonetheless, the majority of dyscalculic children can be differentiated from controls employing brain activation patterns when appropriate methods are used. Sprache: Englisch Gewicht in Gramm: 250.…

Taschenbuch. Etat : Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Please note that the content of this book primarily consists of articlesavailable from Wikipedia or other free sources online. Acalculia (not tobe confused with dyscalculia), from the Greek 'a' meaning 'not' andLatin 'calculare', which means 'to count', is an acquired impairment inwhich patients have difficulty performing simple mathematical taskssuch as adding, subtracting, multiplying and even simply stating whichof two numbers is larger. Acalculia is distinguished from dyscalculia inthat acalculia is acquired late in life due to neurological injury suchas stroke, while dyscalculia is a specific developmental disorder firstobserved during the acquisition of mathematical knowledge. …

Taschenbuch. Etat : Neu. Learning Disability | Dyslexia, Aphasia, Dysgraphia, Dyscalculia, Developmental dyspraxia, Asperger syndrome, Auditory processing disorder, Individuals with Disabilities Education Act, Fuzzbuzz | Frederic P. Miller (u. a.) | Taschenbuch | Englisch | 2026 | OmniScriptum | EAN 9786130087258 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu Print on Demand.…