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. 2017 Jul 31;7:6860. doi: 10.1038/s41598-017-07040-y

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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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Relative spleen size is negatively correlated with pessimism. Visualisation of the Pearson correlations between: relative liver weight, relative spleen weight, speed (i.e. mean latency to displace cones at POS and NEG locations in the cognitive bias test) and the pessimism index for the NNEG trials (PI NNEG; see text for details). The shape and colour of the ellipses represent the direction and strength of the correlations; Pearson correlation coefficients are given in the centre of each ellipse. The critical value of r for significance (at P < 0.05) in a two-tailed Pearson correlation with 12 df is equal to ±0.53. Thus, the only significant correlation is that between relative spleen weight and the Pessimism Index.