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. 2018 Sep 6;8:13347. doi: 10.1038/s41598-018-31619-8

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© The Author(s) 2018

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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Experimental procedures. (a) Online study. In a test trial participants had to rate the computerized face on the trustworthiness dimension using the 8-point scale. Faces were generated following the methods of^80–82 using the FaceGen Modeller 3.1. The selected value appeared on the scale and is immediately followed by public information (fictive rating). In the example, the fictive rating representing public information is 3 points inferior to the participant’s rating. Six blocks of 8 test trials were interleaved with 6 blocks of 8 post-test trials. In a post-test trial participants were instructed to rate for a second time the trustworthiness of the face they watched in test-trial. In the example, the participant exploited public information to adjust the rating (from 4 in the test trial to 1 in the post-test trial). (b) Laboratory study. The structure of the task used in the laboratory was similar as the one used online, but was adapted to the requirements of controlled electroencephalographic recording. Electroencephalographic activity was registered during the presentation of the face in both test and post-test trials (epoch duration: 1200 ms), and during the presentation of public information in test trials (epoch duration: 1200 ms). Sixty blocks of 8 test trials were interleaved with 60 blocks of 8 post-test trials. (c) Types of public information.