Abstract
Motor actions can be simulated and generated through the perception of objects and their characteristics. Such functional characteristics of objects with given action capabilities are called affordances. Here we report an interaction between the perception of affordances and the processing of numerical magnitude, and we show that the numerical information calibrates the judgement of action even when no actual action is required. In Experiment 1, participants had to judge whether they would be able to grasp a rod lengthways between their thumb and index finger. The presentation of the rod was preceded by a number or a non-numerical symbol. When a small number preceded the rod, participants overestimated their grasp; conversely, when a large number preceded the rods, they underestimated their grasp. In Experiment 2, participants were requested to judge if two successive rods had the same length, a judgement that did not involve any grasping. The numerical primes had no effect on this judgement, showing that the magnitude/affordance interaction was not due to a simple perceptual effect. Finally, Experiment 3 showed that the interaction was not present with a non-numerical ordered sequence, thereby eliminating sequence order as a potentially confounding variable.
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Notes
Digits 2 and 8 were used as exemplars of small and large digits to avoid any serial position effects that might have appeared with 1 and 9 due to their being the extremities of the single-digit series.
The 18 rods from Experiment 1 from which the 13 cm reference rod and the 17.5 cm rod were excluded.
The distance effect refers to the fact that the time required to compare two digits is an inverse function of the numerical difference between them (Moyer and Landauer 1967). The magnitude effect indicates that, holding size difference roughly constant, the reaction time to compare two digits increases monotonically as the absolute size of the digits presented increases (Moyer and Landauer 1967). The spatial–numerical association of response codes (SNARC) effect refers to the fact that small numbers are preferentially responded to with the left-hand key, whereas the reverse is true for large numbers (Dehaene et al. 1993).
For a review of the various behavioural paradigms and theoretical/methodological controversies see Milner and Dyde (2003).
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Acknowledgments
This study was supported by the Marie Curie Research Training Networks of the European Community (MRTN-CT-2003-504927, Numbra project), by grant 01/06-267 from the Communauté Française de Belgique—Actions de Recherche Concertées (Belgium), and grant P5/04 from the IUAP Program of the Belgian Federal Goverment. MA is postdoctoral researcher and MP is research associate at the National Fund for Scientific Research (Belgium).
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Badets, A., Andres, M., Di Luca, S. et al. Number magnitude potentiates action judgements. Exp Brain Res 180, 525–534 (2007). https://doi.org/10.1007/s00221-007-0870-y
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DOI: https://doi.org/10.1007/s00221-007-0870-y