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. 2020 May 8;82(6):2924–2936. doi: 10.3758/s13414-020-02043-w

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Examples of happy (top row) and fearful images (middle) used as stimuli for a range of stimulus dilutions (0%–100%). Stimulus dilution increases from left to right showing how the full intensity expression (0%) changes with increasing dilution until the image becomes neutral (100%). The bottom row provides examples of the neutral images (100%) of each face with corresponding symbols used to plot data in Figs. 5b and 6. There are three female faces (open symbols; FF1, FF2, and FF3) and three male faces (symbols; MF1, MF2, and MF3)