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. 2019 Nov 29;9:17884. doi: 10.1038/s41598-019-54074-5

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© The Author(s) 2019

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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Trial structure for famous faces recognition task. Example of four types (a–d) of possible trial structure from the experiment. The possible choices made by the participant are highlighted with red box. (a) A single face (representative image) is shown at the center of the screen (first row) with a response box and two choices. Once they respond, the second screen (second row) displays the choices. Once they select the required option, the next image (b), first row) is displayed on the screen. The task was self-paced. (The modified image was adapted from https://commons.wikimedia.org/wiki/File:Tom_Cruise_avp_2014_4.jpg, available under CC-BY-SA-3.0 license, https://creativecommons.org/licenses/by-sa/3.0/).