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. 2018 Jan 24;8:1564. doi: 10.1038/s41598-018-19925-7

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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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Optical recording characteristics of fast traveling spikes in VSFP butterfly 1.2 transgenic mice. (a) Epileptiform activity from local field potentials recording in the longitudinal hippocampal slice with the administration of 4-AP. (b) Fluorescent image of the VSFP butterfly 1.2 transgenic mice. (c) Electrical recording (local field potential) of the fast traveling spike from the black spot in (b) and optical signals (fluorescent intensity) change over time from 3 different regions of interest, red, green, and, blue spots in (b). (d) Histogram of propagating speed of the fast traveling spikes calculated from mCitrine optical signals. (e) Histogram of propagating speed of the f fast traveling spikes calculated from mKate2 optical signals. (f) Average speeds from mCitrine, mKate2 optical recording and the electrical recording. The speed is ~0.1 m/s and t-test shows that there is no significant difference between two different optical signals. N.S.: no significance.