Adults with developmental dyslexia are slower than controls at speeded digit identification¶

Claim · All claims
Evidence · 1 study · associational r2 · q3 · i3 large
Currency · newest study 2010 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i3 Participants with dyslexia were significantly slower in identifying digits than controls, with a large effect size. → Bert De Smedt 2010

Evidence¶

Bert De Smedt 2010¶

Bert De Smedt, Bart Boets. (2010). Phonological processing and arithmetic fact retrieval: Evidence from developmental dyslexia. Neuropsychologia, 48, 3973–3981. https://doi.org/10.1016/j.neuropsychologia.2010.10.018

q3 · i3 · associational · r2

Speeded digit identification control task (20 trials, digits 0–9) in the dyslexia-control study, with accuracy above 99% in both groups. The dyslexia group's slower digit naming (d = 1.32) motivated including digit identification speed as a covariate in arithmetic reaction-time analyses.

"Participants with developmental dyslexia ( M = 542 ms; SD = 75) were significantly slower in identifying digits than controls ( M = 467 ms; SD = 33; t(48) = 4.59, p < .01, d = 1.32)."

Discussion¶

Related Claims¶

• Children with developmental dyslexia show a processing speed impairment relative to controls
• Adults with dyslexia execute both retrieval and procedural arithmetic strategies more slowly than controls
• Adults with developmental dyslexia use arithmetic fact retrieval less frequently than matched controls during single-digit multiplication and subtraction
• Adults with dyslexia are slower than controls on single-digit arithmetic, with a larger multiplication-minus-subtraction reaction-time difference, even after controlling digit identification speed — related