title: Rational numbers: componential versus holistic representation of fractions in a magnitude comparison task.
abstract: This study investigated whether the mental representation of the fraction magnitude was componential and/or holistic in a numerical comparison task performed by adults. In Experiment 1, the comparison of fractions with common numerators (x/a_x/b) and of fractions with common denominators (a/x_b/x) primed the comparison of natural numbers. In Experiment 2, fillers (i.e., fractions without common components) were added to reduce the regularity of the stimuli. In both experiments, distance effects indicated that participants compared the numerators for a/x_b/x fractions, but that the magnitudes of the whole fractions were accessed and compared for x/a_x/b fractions. The priming effect of x/a_x/b fractions on natural numbers suggested that the interference of the denominator magnitude was controlled during the comparison of these fractions. These results suggested a hybrid representation of their magnitude (i.e., componential and holistic). In conclusion, the magnitude of the whole fraction can be accessed, probably by estimating the ratio between the magnitude of the denominator and the magnitude of the numerator. However, adults might prefer to rely on the magnitudes of the components and compare the magnitudes of the whole fractions only when the use of a componential strategy is made difficult.
authors.affiliation: Unité de Psychologie de l'Education et du Développement, Faculté de Psychologie et des Sciences de l'Education, Université Catholique de Louvain, Louvain-la-Neuve, Belgium.
authors.forename: Gaëlle
authors.initials: G
authors.lastname: Meert
authors.forename: Jacques
authors.initials: J
authors.lastname: Grégoire
authors.forename: Marie-Pascale
authors.initials: MP
authors.lastname: Noël
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D003210:Concept Formation / Q000502:physiology*; D005260:Female; D006801:Humans; D007092:Imagination; D008297:Male; D008433:Mathematics; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D011340:Problem Solving / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D013997:Time Factors; D055815:Young Adult