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ISSN : 1226-9654

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Vol.29 No.2

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The Effect of Density and Size Variance on Numerosity Estimation

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
2017, v.29 no.2, pp.173-180
https://doi.org/10.22172/cogbio.2017.29.2.005


& (2017). The Effect of Density and Size Variance on Numerosity Estimation. The Korean Journal of Cognitive and Biological Psychology, 29(2), 173-180, https://doi.org/10.22172/cogbio.2017.29.2.005

Abstract

In our daily life, it is important to estimate the approximate number of objects containing various sizes and appearing in different densities. However, previous studies mostly used dot stimuli with uniform sizes (Burr & Ross, 2008a; Durgin, 1995). In this study, we investigated how density and size variance influenced numerosity estimation. We found that numerosity was underestimated when density and size variance increased. There was no significant interaction between the density and the size variance. Also, we observed that numerosity was directly estimated by the number mechanism itself across all the range of density, different from the results of previous research. We suggest that this different result is due to various sizes used in this study, which helps the visual system to individuate each object to count.

keywords
개수추정, 크기 변산, 밀도, Numerosity estimation, Size variance, Density

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