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. 2017 Nov 9;7:15151. doi: 10.1038/s41598-017-15495-2

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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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The left and right amygdala activation during perception of fearful (A and B) and neutral faces (C and D). (A) The scatter plot of the trait anxiety and the % signal change in the left amygdala when participants viewed clear fear (averted-gaze fear) faces presented in M-biased (in gray dots) and ambiguous fear (direct-gaze fear) faces in P-biased (in red-green dots) stimuli. The gray and red lines indicate the linear relationship between trait anxiety and the left amygdala activation for the M-biased stimuli and the P-biased stimuli, respectively. The solid, thicker lines indicate statistically significant correlations (FDR adjusted p < 0.05), whereas broken, thinner lines indicate that correlations were not statistically significant. (B) The scatter plot of the trait anxiety and the % signal change in the left amygdala when participants viewed clear fear (averted-gaze fear) faces presented in M-biased (in gray dots) and ambiguous fear (direct-gaze fear) faces presented in P-biased (in red-green dots) stimuli. (C) The scatter plot of the trait anxiety and the % signal change in the left amygdala when participants viewed clear neutral (direct-gaze neutral) faces presented in M-biased (in gray dots) and ambiguous neutral (averted-gaze neutral) faces presented in P-biased (in red-green dots) stimuli. (D) The scatter plot of the trait anxiety and the % signal change in the right amygdala when participants viewed clear neutral (direct-gaze neutral) faces presented in M-biased (in gray dots) and ambiguous neutral (averted-gaze neutral) faces presented in P-biased (in red-green dots) stimuli.