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. 2020 Sep 11;11:573317. doi: 10.3389/fpsyg.2020.573317

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Copyright © 2020 Rivas-Blanco, Pohl, Dale, Heberlein and Range.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Examples of different stimuli combinations. (Top row) “small” numbers: from left to right; 4 vs. 1 (One/Cumulated combination), 2 vs. 5 (Biggest dot/Random combination, largest dot on the left –the lower number), and 8 vs. 3 (Smallest dot/Random, smallest dot on the left –the higher number). (Middle row) “large” numbers: from left to right; 12 vs. 31 (Biggest dot/Random, largest dot on the right –the higher number), 29 vs. 11 (Biggest dot/Random, largest dot on the right –the lower number), and 22 vs. 25 (Smallest dot/Random, smallest dot on the right –the lower number). (Bottom row) control stimuli: left: combination used for shape control trials, right: combination used for size control trials.