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Direct linkBugden, Stephanie; Ansari, Daniel – Developmental Science, 2016
In the present study we examined whether children with Developmental Dyscalculia (DD) exhibit a deficit in the so-called "Approximate Number System" (ANS). To do so, we examined a group of elementary school children who demonstrated persistent low math achievement over 4 years and compared them to typically developing (TD), aged-matched…
Descriptors: Learning Disabilities, Children, Spatial Ability, Short Term Memory
Mejias, Sandrine; Gregoire, Jacques; Noel, Marie-Pascale – Learning and Individual Differences, 2012
It has been hypothesized that developmental dyscalculia (DD) is either due to a defect of the approximate number system (ANS) or to an impaired access between that system and symbolic numbers. Several studies have tested these two hypotheses in children with DD but none has dealt with adults who had experienced DD as children. This study aimed to…
Descriptors: Number Systems, Computation, Mathematics, Adults
Rodríguez-Santos, José Miguel; Calleja, Marina; García-Orza, Javier; Iza, Mauricio; Damas, Jesús – American Annals of the Deaf, 2014
Deaf Children usually achieve lower scores on numerical tasks than normally hearing peers. Explanations for mathematical disabilities in hearing children are based on quantity representation deficits (Geary, 1994) or on deficits in accessing these representations (Rousselle & Noël, 2008). The present study aimed to verify, by means of symbolic…
Descriptors: Evidence, Deafness, Partial Hearing, Number Concepts
Mazzocco, Michele M. M.; Feigenson, Lisa; Halberda, Justin – Child Development, 2011
Many children have significant mathematical learning disabilities (MLD, or dyscalculia) despite adequate schooling. The current study hypothesizes that MLD partly results from a deficiency in the Approximate Number System (ANS) that supports nonverbal numerical representations across species and throughout development. In this study of 71 ninth…
Descriptors: Learning Disabilities, Mathematics Achievement, Academic Achievement, Number Systems
Andersson, Ulf; Ostergren, Rickard – Learning and Individual Differences, 2012
The study sought out to extend our knowledge regarding the origin of mathematical learning disabilities (MLD) in children by testing different hypotheses in the same samples of children. Different aspects of cognitive functions and number processing were assessed in fifth- and sixth-graders (11-13 years old) with MLD and compared to controls. The…
Descriptors: Learning Disabilities, Number Systems, Mathematics Instruction, Short Term Memory
Kaufmann, L.; Vogel, S. E.; Starke, M.; Kremser, C.; Schocke, M. – Cognitive Development, 2009
Ordinality is--beyond numerical magnitude (i.e., quantity)--an important characteristic of the number system. There is converging empirical evidence that (intra)parietal brain regions mediate number magnitude processing. Furthermore, recent findings suggest that the human intraparietal sulcus (IPS) supports magnitude and ordinality in a…
Descriptors: Number Systems, Learning Disabilities, Brain, Numeracy
