Our study suggests that activities focusing specifically on metacognition and WM could foster text comprehension, but the potential benefit is influenced by the training modality, that is, the Reading group obtained greater and longer-lasting improvements than the Active control or Listening groups.

Specific activities focusing on metacognition and working memory may contribute to modifying arithmetical problem-solving performance in primary school children.

It is believed that the approximate estimation of large sets and the exact quantification of small sets (subitizing) are supported by two different systems, the Approximate Number System (ANS) and Object Tracking System (OTS), respectively. It is a current matter of debate whether they are both impaired in developmental dyscalculia (DD), a specific learning disability in symbolic number processing and calculation. Here we tackled this question by asking 32 DD children and 32 controls to perform a series of tasks on visually presented sets, including exact enumeration of small sets as well as comparison of large, uncountable sets. In children with DD, we found poor sensitivity in processing large numerosities, but we failed to find impairments in the exact enumeration of sets within the subitizing range. We also observed deficits in visual short-term memory skills in children with dyscalculia that, however, did not account for their low ANS acuity. Taken together, these results point to a dissociation between quantification skills in dyscalculia, they highlight a link between DD and low ANS acuity and provide support for the notion that DD is a multifaceted disability that covers multiple cognitive skills.

Problem-solving abilities, text comprehension, and working memory updating were investigated in 25 8-year-old children with a specific difficulty at comprehending written texts (i.e., poor comprehenders) and 25 control children matched for gender, age, schooling, and reading decoding ability. Poor comprehenders revealed to be less competent not only in the tasks that required a good text comprehension but also in problem-solving and updating tasks. Results are discussed in terms of their implications for educational settings

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