title: Number comparison and number ordering as predictors of arithmetic performance in adults: Exploring the link between the two skills, and investigating the question of domain-specificity.
abstract: Recent evidence has highlighted the important role that number-ordering skills play in arithmetic abilities, both in children and adults. In the current study, we demonstrated that number comparison and ordering skills were both significantly related to arithmetic performance in adults, and the effect size was greater in the case of ordering skills. Additionally, we found that the effect of number comparison skills on arithmetic performance was mediated by number-ordering skills. Moreover, performance on comparison and ordering tasks involving the months of the year was also strongly correlated with arithmetic skills, and participants displayed similar (canonical or reverse) distance effects on the comparison and ordering tasks involving months as when the tasks included numbers. This suggests that the processes responsible for the link between comparison and ordering skills and arithmetic performance are not specific to the domain of numbers. Finally, a factor analysis indicated that performance on comparison and ordering tasks loaded on a factor that included performance on a number line task and self-reported spatial thinking styles. These results substantially extend previous research on the role of order processing abilities in mental arithmetic.
authors.affiliation: a School of Psychology , Queen's University Belfast , Belfast , UK.
authors.forename: Kinga
authors.identifier: http://orcid.org/0000-0002-7550-1454
authors.initials: K
authors.lastname: Morsanyi
authors.affiliation: a School of Psychology , Queen's University Belfast , Belfast , UK.
authors.forename: Eileen
authors.initials: E
authors.lastname: O'Mahony
authors.affiliation: a School of Psychology , Queen's University Belfast , Belfast , UK.
authors.forename: Teresa
authors.initials: T
authors.lastname: McCormack
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D004215:Distance Perception / Q000502:physiology*; D005260:Female; D006801:Humans; D007600:Judgment / Q000502:physiology*; D008297:Male; D008433:Mathematics; D008875:Middle Aged; D010775:Photic Stimulation; D011340:Problem Solving / Q000502:physiology*; D011597:Psychomotor Performance; D013850:Thinking / Q000502:physiology; D055815:Young Adult
keywords: Arithmetic skills; distance effect; mental number line; number comparison; number ordering