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. 2016 Jul 13;17:48. doi: 10.1186/s12868-016-0282-7

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Norm vectors for the segmented eye bulbs (normalized images) in a subject. The upper row in black shows the predetermined eye state (1 closed, 0 opened). RB (right) and LB (left) are the x/y/z dimensions of the norm (unity) vector describing the absolute eye position at each given time point. The correlation coefficients for the x/y/z dimensions of the left and right eyes are as follows: x-dimension 0.978, y-dimension −0.636 and z-dimension 0.994. The correlations with predetermined eye states are x-dimension 0.919 (left) and 0.920 (right), y-dimension 0.704 (left) and −0.838 (right) and z-dimension 0.930 (left) and 0.938 (right). X-axis: time in seconds; y-axis of left/right eye: x/y/z dimensions of norm vector (in voxel)