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. 2019 Jul 16;9:10313. doi: 10.1038/s41598-019-46482-4

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© The Author(s) 2019

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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Factor analysis on appetitive and aversive performances. (A) factor analysis on the 4 response scores (Sucrose: sucrose responsiveness; CS+Ap: appetitive learning score; Heat: heat responsiveness; CS+Av: aversive learning score) measured in 226 individuals. Two main factors with eigenvalues higher than 1 are extracted. Factor 1 (45.6% variance) shows a clear opposite relationship between appetitive and aversive variables. Factor 2 (27.5% variance) is related to differences in average response magnitude among individuals. (B) Response scores (mean ± SEM) of the first and last 10% of the distribution of individuals on Factor 1 or Factor 2.