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¶

Claim · All claims
Evidence · 1 study · review r2 · q2
Currency · newest study 2020 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? Adults with DD frequently recruit procedural strategies including finger counting for single-digit problems typically solved by memory retrieval, and their longer response latencies on numerical magnitude tasks appear number-specific since non-numerical semantic categorization is as fast as controls. → Liane Kaufmann 2020

Evidence¶

Liane Kaufmann 2020¶

Liane Kaufmann, Michael von Aster, Silke M. Göbel, Josef Marksteiner, and Elise Klein. (2020). Developmental Dyscalculia in Adults: Current Issues and Open Questions for Future Research. Lernen und Lernstörungen, 9(2), 126–137. https://doi.org/10.1024/2235-0977/a000294

q2 · i? · review · r2

Review reports Cappelletti and Price (2014) findings that DD adults' "longer response latencies ... seem to be number-specific": slower on numerical magnitude judgements but equally fast on non-numerical semantic categorization. A case study (Kaufmann et al., 2011a) documented finger usage on single-digit problems with remarkably longer reaction times.

"compared with controls, adults with DD needed longer to solve tasks requiring numerical magnitude judgements, but were as fast as controls in tasks involving non-numerical semantic categorizations"

Discussion¶

Related Claims¶

• Adults use a mix of retrieval and procedural strategies in single-digit arithmetic, with retrieval more frequent in multiplication and procedures more frequent in subtraction — related
• Adults with developmental dyslexia use arithmetic fact retrieval less frequently than matched controls during single-digit multiplication and subtraction — related
• Neuroimaging shows adults with DD exhibit stronger frontal activations during number semantics, reduced right parietal grey matter, and altered functional connectivity during non-symbolic magnitude comparison — related
• Working memory demand increases with the complexity of arithmetic and math problems, including operand size and number of solution steps — related
• Adults with DD show deficient conceptual size processing with preserved physical size processing, supporting shared magnitude substrates — related
• Adults with DD show deficient time/duration processing but preserved length processing, with mixed findings across studies — related
• Arithmetic deficits in adults with DD concentrate in mental calculation, arithmetical rules, and written calculation, with number comprehension and transcoding preserved — related
• Simple subtraction in adults relies heavily on strategy use, which disadvantages participants under limited working memory resources — related
• Adults with DD show deficient alerting and executive attention with preserved orienting, indicating domain-general deficits beyond number processing — reports the opposite
• Adults with dyslexia execute both retrieval and procedural arithmetic strategies more slowly than controls — related
• Adults with dyslexia without dyscalculia show no deficit in nonsymbolic numerical magnitude processing — related