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