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. 2017 Aug 1;7:7052. doi: 10.1038/s41598-017-06707-w

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© The Author(s) 2017

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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Outline of the perceptual (A) and memory (B) tasks. 2-AFC responses in both tasks are followed by rating confidence in a 1–6 scale. (A) One trial in the perceptual task (N = 180) consisted of two displays of 6 Gabor gratings each presented for 85 msec and separated by a 1000 msec ISI. Participant should indicate whether he observed the odd Gabor in the 1st or the 2nd interval. (B) The memory task included a learning and a recognition phase. During the learning phase (N = 100) each word is displayed for 1500 msec with 1000 msec interval between subsequent words. In the recognition phase (N = 200) a word was presented asking whether it was already seen or not.