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. 2021 Jun 22;4:768. doi: 10.1038/s42003-021-02294-9

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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. 1 — a Small object (toothbrush), normal object-scene scale consistency level. b Small object (toothbrush), maximum mis-scaled level. c Large object (car), normal object-scene scale consistency level. d Large object (car), maximum mis-scaled level. Images a and b show a retinal size manipulation (fixed scene field-of-view (FOV), with changing object retinal size). Images c and d show a scene FOV manipulation (fixed object retinal size, with changing FOV). e Schematic of a single trial presentation in the fMRI experiment. For visibility here, the central fixation point is shown larger than the actual size used and with a lighter gray outer ring (in the actual experiment the gray ring matched the background gray of the screen). f Example of the event order in a single scan. Each vertical multi-colored line indicates the onset time of an event, with the property levels for each of four properties that can be defined in the images (scale consistency, object retinal size, real-world size, scene field-of-view) indicated by color (see legend).