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Sarit Ashkenazi, Nitza Mark-Zigdon and Avishai Henik Do subitizing deficits in developmental dyscalculia involve pattern recognition weakness? Developmental Science 16

Version of Record online: 18 OCT 2012 | DOI: 10.1111/j.1467-7687.2012.01190.x

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The abilities of children diagnosed with developmental dyscalculia (DD) were examined in two types of object enumeration: subitizing, and small estimation (5–9 dots). Subitizing is usually defined as a fast and accurate assessment of a number of small dots (range 1 to 4 dots), and estimation is an imprecise process to assess a large number of items (range 5 dots or more). Based on reaction time (RT) and accuracy analysis, our results indicated a deficit in the subitizing and small estimation range among DD participants in relation to controls. Dots were presented in canonical or random arrangement. DD participants presented a deficit in the estimation of canonically arranged dots. The present finding indicates that pattern recognition difficulties may play a significant role in subitizing deficits among those with DD.

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