Developmental Dyscalculia

Košč, Ladislav

doi:10.1177/002221947400700309

Cited by 271 publications

(227 citation statements)

References 10 publications

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“…Deficits of number processing should be observed in case of early left parietal injury or disorganisation. Developmental dyscalculia is relatively frequent, affecting 3-6% of children (Badian, 1983;Kosc, 1974;Lewis, Hitch, & Walker, 1994). We predict that a fraction of those children may suffer from a core conceptual deficit in the numerical domain.…”

Section: Developmental Dyscalculia and The Ontogeny Of Number Represementioning

confidence: 94%

Three Parietal Circuits for Number Processing

Dehaene

Piazza

Pinel

et al. 2003

Cognitive Neuropsychology

2,157

208

2,149

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Did evolution endow the human brain with a predisposition to represent and acquire knowledge about numbers? Although the parietal lobe has been suggested as a potential substrate for a domain-specific representation of quantities, it is also engaged in verbal, spatial, and attentional functions that may contribute to calculation. To clarify the organisation of number-related processes in the parietal lobe, we examine the three-dimensional intersection of fMRI activations during various numerical tasks, and also review the corresponding neuropsychological evidence. On this basis, we propose a tentative tripartite organisation. The horizontal segment of the intraparietal sulcus (HIPS) appears as a plausible candidate for domain specificity: It is systematically activated whenever numbers are manipulated, independently of number notation, and with increasing activation as the task puts greater emphasis on quantity processing. Depending on task demands, we speculate that this core quantity system, analogous to an internal "number line," can be supplemented by two other circuits. A left angular gyrus area, in connection with other left-hemispheric perisylvian areas, supports the manipulation of numbers in verbal form. Finally, a bilateral posterior superior parietal system supports attentional orientation on the mental number line, just like on any other spatial dimension.

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Section: Developmental Dyscalculia and The Ontogeny Of Number Represementioning

confidence: 94%

Three Parietal Circuits for Number Processing

Dehaene

Piazza

Pinel

et al. 2003

Cognitive Neuropsychology

2,157

208

2,149

View full text Add to dashboard Cite

show abstract

“…Developmental dyscalculia, defined as a disproportionate deficit in calculation and arithmetic, is a relatively frequent deficit (3-6% of children) which can be observed either in conjunction with reading and/or attention disorders, or in isolation (Kosc, 1974;Sokol, Macaruso, & Gollan, 1994;Spellacy & Peter, 1978). Two recent papers have observed clear impairments of the left parietal cortex in children with developmental dyscalculia associated with prematurity (Isaacs, Edmonds, Lucas, & Gadian, 2001) or of unknown origin (Levy, Reis, & Grafman, 1999).…”

Section: Introductionmentioning

confidence: 99%

A cognitive characterization of dyscalculia in Turner syndrome

et al. 2004

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Current theories of number processing postulate that the human abilities for arithmetic are based on cerebral circuits that are partially laid down under genetic control and later modified by schooling and education. This view predicts the existence of genetic diseases that interfere specifically with components of the number system. Here, we investigate whether Turner syndrome (TS) corresponds to this definition. TS is a genetic disorder which affects one woman in 2500 and is characterized by partial or complete absence of one X chromosome. In addition to well-characterized physical and hormonal dysfunction, TS patients exhibit cognitive deficits including dyscalculia. We tested 12 women with Turner syndrome and 13 control subjects on a cognitive battery including arithmetical tests (addition, subtraction, multiplication, division) as well as tests of the understanding of numerosity and quantity (cognitive estimation, estimation, comparison, bisection, subitizing/counting). Impairments were observed in cognitive estimation, subitizing, and calculation. We examine whether these deficits can be attributed to a single source, and discuss the possible implications of hormonal and genetic factors in the neuropsychological profile of TS patients.

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“…The research that has been conducted suggests that between 6 and 7% of school-age children suffer from a cognitive or neuropsychological deficit that interferes with their ability to acquire grade-level mathematical competencies, despite an average or higher IQ and adequate instruction (Badian, 1983;Gross-Tsur, Manor, & Shalev, 1996;Kosc, 1974). These studies indicate that the number of children affected by MD is comparable to the number of children affected by RD.…”

mentioning

confidence: 99%

Numerical and Arithmetical Cognition: Patterns of Functions and Deficits in Children at Risk for a Mathematical Disability

Geary

Hoard

Hamson

1999

Journal of Experimental Child Psychology

351

314

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Based on performance on standard achievement tests, first-grade children (mean age ϭ 82 months) with IQ scores in the low-average to high-average range were classified as at risk for a learning disability (LD) in mathematics, reading, or both. These at-risk children (n ϭ 55) and a control group of academically normal peers (n ϭ 35) were administered experimental tasks that assessed number comprehension and production skills, counting knowledge, arithmetic skills, working memory, and ease of retrieving information from long-term memory. Different patterns of intact cognitive functions and deficits were found for children in the different at-risk groups. As a set, performance on the experimental tasks accounted for roughly 50% and 10% of the group differences in mathematics and reading achievement, respectively, above and beyond the influence of IQ. Performance on the experimental tasks thus provides insights into the cognitive deficits underlying different forms of LD, as well as into the sources of individual differences in academic achievement.

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Developmental Dyscalculia

Cited by 271 publications

References 10 publications

Three Parietal Circuits for Number Processing

Three Parietal Circuits for Number Processing

A cognitive characterization of dyscalculia in Turner syndrome

Numerical and Arithmetical Cognition: Patterns of Functions and Deficits in Children at Risk for a Mathematical Disability

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