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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
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Libertus, Melissa E.; Feigenson, Lisa; Halberda, Justin – Learning and Individual Differences, 2013
Previous research shows that children's ability to estimate numbers of items using their Approximate Number System (ANS) predicts later math ability. To more closely examine the predictive role of early ANS acuity on later abilities, we assessed the ANS acuity, math ability, and expressive vocabulary of preschoolers twice, six months apart. We…
Descriptors: Preschool Children, Number Systems, Mathematics, Nonverbal Ability
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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