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See detailDifferences in the acuity of the Approximate Number System in adults: The effect of mathematical ability
Guillaume, Mathieu UL; Nys, Julie; Mussolin, Christophe et al

in Acta psychologica (2013), 144(3), 506-512

It is largely admitted that processing numerosity relies on an innate Approximate Number System (ANS), and recent research consistently observed a relationship between ANS acuity and math ability in ... [more ▼]

It is largely admitted that processing numerosity relies on an innate Approximate Number System (ANS), and recent research consistently observed a relationship between ANS acuity and math ability in childhood. However, studies assessing this relationship in adults led to contradictory results. In this study, adults with different levels of mathematical expertise performed two tasks on the same pairs of dot collections, based either on numerosity comparison or on cumulative area comparison. Number of dots and cumulative area were congruent in half of the stimuli, and incongruent in the other half. The results showed that adults with higher math ability obtained lower Weber fractions in the numerical condition than participants with lower math ability. Further, adults with lower math ability were more affected by the interference of the continuous dimension in the numerical comparison task, whereas conversely higher-expertise adults showed stronger interference of the numerical dimension in the continuous comparison task. Finally, ANS acuity correlated with arithmetic performance. Taken together, the data suggest that individual differences in ANS acuity subsist in adulthood, and that they are related to math ability. [less ▲]

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See detailIs adding 48 + 25 and 45 + 28 the same? How addend compatibility influences the strategy execution in mental addition.
Guillaume, Mathieu UL; Nys, Julie; Content, Alain

in Journal of cognitive psychology (2012), 24(7), 836-843

A recent study revealed that adults frequently start to add two two-digit numbers from the larger one, suggesting that addend magnitudes are compared at an early stage of processing. However, several ... [more ▼]

A recent study revealed that adults frequently start to add two two-digit numbers from the larger one, suggesting that addend magnitudes are compared at an early stage of processing. However, several studies showed that symbolic number comparison involves compatibility effects: such numerical comparison is easier when the larger number also contains the larger unit (48_25) than in the opposite, incompatible case (45_28). In this context, whether the compatibility between tens and units across operands affects the execution of arithmetic solving strategies remains an open question. In this study, we used two kinds of verbal protocols to assess how addend compatibility influences the implementation of magnitude-based strategies. We observed that participants started their computations from the larger operand more frequently when solving compatible additions than they did when solving incompatible ones. The presence of a compatibility effect extends the view that multi-digit number processing is componential rather than holistic, even in an arithmetic task that did not explicitly require a number magnitude comparison. Further, the findings corroborate the notion that number magnitude is used in mental calculation and influences the way calculation strategies are implemented. [less ▲]

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See detailWeber Fraction as an index of the acuity of the ANS and its relationship to arithmetic performance by adults
Guillaume, Mathieu UL; Mussolin, Christophe; Nys, Julie et al

Scientific Conference (2012)

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See detailThe relation between the acuity of the ANS and general arithmetic performance
Guillaume, Mathieu UL; Mussolin, Christophe; Nys, Julie et al

Scientific Conference (2012)

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See detailThe influence of number sense acuity and mathematical expertise on mental addition strategies
Guillaume, Mathieu UL; Nys, Julie; Content, Alain

Poster (2011)

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See detailRelation entre expertise mathématique et sensibilité à la numérosité à l’âge adulte
Guillaume, Mathieu UL; Mussolin, Christophe; Nys, Julie et al

Scientific Conference (2011)

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See detailNumber sense and mathematical expertise: The strategic view.
Guillaume, Mathieu UL; Nys, Julie; Content, Alain

Poster (2011)

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See detailMental Arithmetic: Eye Movement Correlates of Calculation Strategies
Guillaume, Mathieu UL; Nys, Julie; Content, Alain

Poster (2009)

Detailed reference viewed: 27 (0 UL)