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. 2020 Dec 17;10:22116. doi: 10.1038/s41598-020-79089-1

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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(A–C) Experiment set-up. Spatial (A) and temporal (B,C) arrangement of vergence and saccade tests. Subjects looked successively at different LEDs; from the initial (40 cm) fixation LED, to the target LED for divergence (150 cm) or the target LED for convergence (20 cm) (B); and from the initial (40 cm) fixation LED to the target LED for saccades (20° to left or right) (C). Each trial starts with the fixation target that appears for a variable period of 1200–1800 ms; following this period the target LED lights are on for 2000 ms together with a paired buzzer preceding 50 ms and lasting only 100 ms. (C) Arrows indicate the possible target locations for each test.