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. 2019 Dec 18;9:19399. doi: 10.1038/s41598-019-55350-0

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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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Mnemonic Discrimination and Match-to-Sample task designs: (A). The mnemonic discrimination task comprised of an initial encoding phase followed by a test phase. Stimuli at test were either exact Target Repeats or Lure Distractors deviated from faces at encoding by 20%, 30%, 40%, or 50% perturbations. Subjects indicated whether test faces were the same or different from faces presented in the encoding phase. (B) The match-to-sample task comprised of only one phase where subjects saw a face followed by a mask for 2.5 s, followed by either a Target Repeat or Lure Distractor. They indicated whether the second face was the same or different from the face prior to the mask. On both mnemonic discrimination and match-to-sample tasks, stimulus duration = 3.0 s and ITI = 1.5 s.