trisomy 21

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tandfonline.com – The Influence of Trisomy 21 on Subitising Limit

Posted on by Troels Gannerup Christensen - Læst 4 gange

tandfonline.com har udgivet en rapport under søgningen “Teacher Education Mathematics”: ABSTRACT ABSTRACT Empirical evidence suggests a phonological loop deficit associated with Down syndrome. A trisomy 21 may be associated with a narrowing of visual attention to fewer than four objects at a time too. In a study with computer tachistoscopy, the hypothesis was confirmed in all 194 persons with trisomy 21. The subitising limit of persons with trisomy 21 thus has a value that lies between the value of neurotypical persons and persons with simultanagnosia. A fitting term would therefore be ‘simultandysgnosia’. Consideration of this dysgnosia could prove to be a key to learning disabilities in mathematics in particular and learning disabilities in general. Diagnostic and learning methods should consider this limitation of the attention span not only in verbal… Continue Reading →

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tandfonline.com – Relating Math Words, Visual Images, and Math Symbols for Understanding and Competence

Posted on by Troels Gannerup Christensen - Læst 12 gange

tandfonline.com har udgivet en rapport under søgningen “Teacher Education Mathematics”: ABSTRACT ABSTRACT This paper briefly overviews my research in supporting children to learn number concepts by relating number words, research-based visual supports, and math symbols. I first outline my approach to helping children build relationships between the use of concrete materials and the building of abstract concepts. I then focus on two crucial early aspects of building meanings for numbers: (1) understanding break-apart partners such as 5=3+2 that support addition and subtraction with small numbers and children’s moving on to Level 2 counting on and algebraic problem representations, and (2) the use of visual five-groups in understanding numbers 1–1000 and in drawings to support multi-digit computations. The research-based learning path of visual-spatio supports is shown and discussed for each topic,… Continue Reading →