Asymmetrical interference between number and item size perception provides evidence for a domain specific impairment in dyscalculia.

In line with these observations, the 2 (task: judge number/mean size) x 2 (unattended magnitude: small/big) repeated measure ANOVA performed on PSEs estimates showed a highly significant interaction between task and magnitude of the unattended dimension (F(1,13) = 52.17, p<10 −5 ), with PSE estimates differing between small and large unattended magnitude only for the average size task (p<10 −5 ) but not for the numerosity task (p = 0.37).

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Here we found that the weber fraction for numerosity was on average higher in dyscalculics than in controls, however this difference did not reach statistical significance, which could be due to the modest sample size available.

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