Arithmetic deficits in adults with DD concentrate in mental calculation, arithmetical rules, and written calculation, with number comprehension and transcoding preserved¶

Claim · All claims
Evidence · 1 study (2 entries) · associational r2 · q3 · i0–i3
Currency · newest study 2022 · not yet checked against its sources · not reviewed by a person · recheck by 2027: baselines and conditions change

Subclaims¶

q3 i3 Adults with DD scored significantly lower than controls in total mental calculation (r = -0.614, p < 0.001) and total written calculation (r = -0.500, p < 0.001). → Vigna Giulia 2022 q3 i0 The two groups did not differ in number comprehension (r = -0.082, p = 0.278) or transcoding. → Vigna Giulia 2022 (2)

Evidence¶

Vigna Giulia 2022¶

Vigna Giulia, Ghidoni Enrico, Burgio Francesca, Danesin Laura, Angelini Damiano, Benavides-Varela Silvia, Semenza Carlo. (2022). Dyscalculia in Early Adulthood: Implications for Numerical Activities of Daily Living. Brain Sciences. https://doi.org/10.3390/brainsci12030373

q3 · i3 · associational · r2

Wilcoxon rank-sum comparison on the NADL Formal mental calculation subtest (26 DD vs 26 controls): DD mean 15.15 (SD 1.67) versus 17.23 (SD 1.14) for controls, effect size "−0.614", p < 0.001. Written calculation showed a similar significant difference (r = −0.500).

"Total mental calculation* 18 15.15 1.67 17.23 1.14 102.5 <0.001 −0.614 .000"

Vigna Giulia 2022 (2)¶

Vigna Giulia, Ghidoni Enrico, Burgio Francesca, Danesin Laura, Angelini Damiano, Benavides-Varela Silvia, Semenza Carlo. (2022). Dyscalculia in Early Adulthood: Implications for Numerical Activities of Daily Living. Brain Sciences. https://doi.org/10.3390/brainsci12030373

q3 · i0 · associational · r2

NADL Formal number comprehension subtest comparing 26 DD and 26 controls: DD mean 16.58 (SD 0.76) versus 16.69 (SD 0.62) for controls, effect size "−0.082", p = 0.278, Bayes factor 4.100. Transcoding likewise showed no significant group difference.

"Total number comprehension 17 16.58 0.76 16.69 0.62 313.0 0.278 −0.082 4.100"

Discussion¶

Related Claims¶

• Adults with DD rely on time-consuming back-up strategies like finger usage for single-digit arithmetic, with prolonged response latencies that appear number-specific — related
• Children with DD show slower reaction times than TD children during arithmetic problem solving, with no operation-specific RT effect — related
• Adults with developmental dyscalculia score significantly lower than controls on the formal NADL test of school-acquired numerical abilities — related