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. 2017 Jul 12;7:5208. doi: 10.1038/s41598-017-05610-8

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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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(a) The viewing of a Necker cube causes the perceptual system to alternate between two rivaling perceptual representations. The onset of each of the alternating percepts is reported by use of button presses. The perceptual duration of each individual percept is defined as the time interval between two button presses. (b) Probability distribution of perceptual durations of individual perceptual representations during Necker cube viewing after normal sleep. The distribution had a positive skew, with a mean value of 8.87 s and a median value of 5.94 s. (c) EEG data were recorded continuously while participants reported the perceived reversals of the representations of the ambiguous Necker cube by pressing a button. In the first analysis, alpha power was computed on whole perceptual durations, excluding the periods just preceding and following the button presses (gray areas). In a more finely grained second analysis, alpha power was calculated on a sliding window starting right after the emergence of a percept and evaluated on its predictive value for the perceptual duration of the present percept.