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. 2017 Oct 16;7:13191. doi: 10.1038/s41598-017-13510-0

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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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Learning curves. (a) Trial length, (b) normalized trial length (T/T₀), (c) cumulated reward per trial across the experimental duration in the conditions GG (blue) and CG (red). The normalized trial length (b) reveals a monotonic improvement for both groups whereas the other measures (trial length and reward) are non-monotonic. (d) The average increase of the gravity of subject in condition GG. The shaded areas indicate the inter-subject-variability (±1SEM). The black dashed lines indicate the time at which all subjects in condition GG have reached maximum gravity (g_max = 3.5 m/s²) latest. For the purpose of illustration, the curves were smoothed over time using the weighted running average method.