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ISSN : 1226-9654

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Vol.27 No.4

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The effects of physical size of numbers versus numerical values in line bisection task with numerical flankers

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
2015, v.27 no.4, pp.763-776
https://doi.org/10.22172/cogbio.2015.27.4.008



& (2015). The effects of physical size of numbers versus numerical values in line bisection task with numerical flankers. The Korean Journal of Cognitive and Biological Psychology, 27(4), 763-776, https://doi.org/10.22172/cogbio.2015.27.4.008

Abstract

Mental magnitude line assumes that various magnitude dimensions share common resources. However, relative influence between discrete dimensions such as digit or numerosity versus continuous dimensions such as size or length is a matter of debate when they are presented together. Some argue that numbers are cognitively more salient than other magnitude dimensions, but others claim that dominant magnitude dimension can change depending on context. This study examined automatic processing of numerical values using line bisection task with numerical flankers where participants respond to the center of presented line while disregarding numbers which appear at the two ends of the line. In addition, contrary to numerical Stroop task which separately tests individual influence of numerical value or physical size of numbers under different conditions, we directly compared relative influence of numerical value vs. physical size by manipulating the two variable dimensions within a same task. Although there was no effect of physical size of numerical flankers in the line bisection, a reliable bias toward numerically larger number was observed when numerical values of the flankers were manipulated. In Stroop line bisection where both physical size and numerical value of flankers were manipulated, a strong bias toward numerically larger number was obtained indicating greater influence of numerical value than physical size. In addition, size incongruity effect between physical size and numerical value was also observed. These results not only replicate the previous finding that discrete and continuous magnitude dimensions share common resources but also imply that numerical value is cognitively salient so that the processing for numerical values is automatic even when they are task-irrelevant.

keywords
내적 수직선, 내적 양 직선, 크기불일치성효과, 스트룹 숫자수반 선분양분과제, mental number line, mental magnitude line, size congruity effect, Stroop bisection with numerical flankers

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