The present study grounds on the absence of evidence-based treatment in individuals with developmental dyscalculia (DD). At this topic, the present study will explore the potential effect of transcranial random noise stimulation (tRNS) over dorsolateral prefrontal cortex (DLPFC) or posterior parietal cortex (PPC), cerebral areas usually disrupted in individuals with DD, in addition to a usual treatment such as cognitive training. Therefore, the investigators hypothesized that active tRNS over DLPFC or PPC combined to cognitive training will boost math and math-related skills in children and adolescents with DD, modulating theta/beta ratio around stimulated cerebral network. On the contrary, sham tRNS (placebo) over DLPFC or PPC combined to cognitive training will not have significant effect in improving math skills. Further, both active and sham tRNS combined to cognitive training will be safe and well tolerated.
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Timeframe: immediately after the intervention, one week and three months after the intervention