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. 2020 Nov 20;10:20302. doi: 10.1038/s41598-020-76847-z

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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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Trial procedure for impression formation fMRI task. A high (or low) SES woman’s (or man’s) face would appear (in place of the gray silhouettes pictured above) for 1500 ms followed by an intertrial interval (ITI) consisting of a fixation cross of a jittered duration between 500 and 6500 ms before the next face would appear. To indicate that they had formed their impressions for each face, participants responded by pressing simultaneously buttons assigned to each index finger. Participants were encouraged to finish forming their impressions by the time the face disappeared or shortly thereafter. Participants completed 112 total impression formation trials over two runs.