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. 2018 Dec 5;1:215. doi: 10.1038/s42003-018-0225-1

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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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Fig. 1 — Time line of the binocular flash suppression paradigm. The task consisted of two conditions, namely a physical alternation (PA) and b flash suppression (FS). The percept is shown in c. Each trial started with a fixation spot presented to both eyes for 0.3 s, after which a face or a checkerboard pattern was monocularly presented for one second. Following this, a second stimulus was added to the contralateral eye after extinguishing (in PA) or without the removal of the first stimulus (in FS). The time axis next to each trial type indicates trial chronology, starting at the top, and finishing at the bottom. Stimuli presented during the two conditions in the upper panel elicit a perceptual transition from a face to a checkerboard pattern, while in the lower panel, the order of stimulus presentation is reversed. Note that although the sensory stimulation is different across the two conditions, PA (a) and FS (b), the subject’s percept (c) is the same within the two trial types. Trial types presented in the figure comprise half of the trials, where the first visual pattern was presented in the left eye. In the rest of the trials, the first visual pattern was presented in the right eye (refer to the Methods section for details)