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. 2018 Jun 20;10:22. doi: 10.1186/s11689-018-9240-2

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© The Author(s). 2018

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. 1 — Gains over time in fluid reasoning predicted by X-activation ratio. Legend: estimated average trajectories over time in fluid intelligence for individuals with X-activation ratio at the mean (solid), 1 standard deviation (SD) below the mean (short-dashed) and 1 SD above the mean (long-dashed). Higher ratios of affected to total chromosomes were associated with a slower rate of improvement in fluid intelligence over time