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. 2021 Jul 28;12:4597. doi: 10.1038/s41467-021-24880-5

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a For family discrimination, each trial consisted of three images, two statistically matched. Subjects were asked to indicate the stimulus from a different category. We presented both large stimuli (top), and smaller stimuli cropped from them (bottom). b For sample discrimination, each trial consisted of three statistically matched images, two physically identical. Subjects were asked to indicate the physically different stimulus. c Stimuli cropped using circular apertures of five sizes were presented so that the closest edge was 4 degrees from fixation. d The sequential/temporal task followed an AXB design (is the middle stimulus different from the first or last?). e The simultaneous/spatial task followed an oddity design (which stimulus differs from the other two?). f Average proportion correct for four subjects performing the sequential family (red) and sample (black) discrimination tasks as a function of stimulus diameter. Shaded regions represent mean ± SEM across all trials. g Average proportion correct for four subjects performing the simultaneous (spatially displaced) task. Shaded regions represent mean ± SEM across all trials. Source data are provided as a Source Data file.