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A model of symbol size discrimination in scatterplots

Published: 10 April 2010 Publication History

Abstract

Symbols are used in scatterplots to encode data in a way that is appropriate for perception through human visual channels. Symbol size is believed to be the second dominant channel after color. We study symbol size perception in scatterplots in the context of analytic tasks requiring size discrimination. More specifically, we performed an experiment to measure human performance in three visual analytic tasks. Circles are used as the representative symbol, with eight, linearly varying radii; 24 persons, divided across three groups, participated; and both objective and subjective measures were obtained. We propose a model to describe the results. The perception of size is assumed to be an early step in the complex cognitive process to mediate discrimination, and psychophysical laws are used to describe this perceptual mapping. Different mapping schemes are compared by regression on the experimental data. The results show that approximate homogeneity of size perception exists in our complex tasks and can be closely described by a power law transformation with an exponent of 0.4. This yields an optimal scale for symbol size discrimination.

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cover image ACM Conferences
CHI '10: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
April 2010
2690 pages
ISBN:9781605589299
DOI:10.1145/1753326
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Published: 10 April 2010

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Author Tags

  1. graphical encoding
  2. quantitative model
  3. scatterplots
  4. size discrimination
  5. symbol size
  6. user experiment.
  7. visual analytic task

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  • (2024)A Grid-Based Method for Removing Overlaps of Dimensionality Reduction Scatterplot LayoutsIEEE Transactions on Visualization and Computer Graphics10.1109/TVCG.2023.330994130:8(5733-5749)Online publication date: Aug-2024
  • (2023)Measuring Categorical Perception in Color-Coded ScatterplotsProceedings of the 2023 CHI Conference on Human Factors in Computing Systems10.1145/3544548.3581416(1-14)Online publication date: 19-Apr-2023
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