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. 2018 Jan 29;8:1733. doi: 10.1038/s41598-017-18784-y

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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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Panel (a) Dopamine system index for all nations for which data was available (see Supplementary Table 1 for data). The index was normalized and standardized to range between 0 (lowest dopamine functioning) and 100 (highest observed dopamine functioning). Panel (b) Climatic demands for all nations included in the analysis. Climatic stress was computed as the sum of the deviations from 22 °C (ca. 72F) for the lowest and highest temperatures in the coldest month, and the lowest and highest temperatures in the hottest month. Panel (c) Joint distribution of the combined Extraversion personality scores for all nations where Dopamine data was available. The rescaled data (varying between 0 and 100) from the three personality data sources was linearly combined. Panel (d) Joint distribution of the combined Neuroticism personality scores for all nations where Dopamine data was available. The rescaled data (varying between 0 and 100) from the three personality data sources was linearly combined. The data was plotted using the rworldmap package in R.