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Verifying use of reference points in the number line estimation task

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
2016, v.28 no.4, pp.653-673
https://doi.org/10.22172/cogbio.2016.28.4.003



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Abstract

Number line estimation task has been widely used to test spatial representation of numerical concepts. However, the claim of power model that participants respond based on a few reference points suggests the possibility that results can be affected by cognitive strategies. The current research tested whether use of reference points in number line estimation task affects shape of mental number line, that is, participants’ response patterns. Based on the reliable linearity reported in adults’ mental number line, we asked our adult participants to estimate positions including both reference points and those close to the reference points, and then observed whether there happens any change in the typical linearity in number line estimation. The results showed linearity in the middle reference points, but the tendency was fairly weaker in the other reference points. In particular, greater estimation bias was observed for the positions closer to the reference points, indicating use of reference points in estimation and importance of middle reference point. In addition, bipolar response tendency was obtained where participants underestimate or overestimate reference points on the left or right side of the line, respectively. Additional experimental results showed stronger bipolarity for longer line lengths, suggesting importance of line length in number line estimation task. These results imply that researchers need to be cautious in interpretation of experimental data as the results can be easily affected by various perceptual and cognitive factors.

keywords
내적수직선, 수직선추정과제, 비율판단의 파워모형, 기준점 책략, 선분 길이, mental number line, number line estimation task, power model of proportion judgment, cyclical model, line length

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The Korean Journal of Cognitive and Biological Psychology