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. 2017 Nov 3;7:15025. doi: 10.1038/s41598-017-14203-4

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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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Effect of delta-9-THC (interrupted blue line) and placebo (continuous green line) on gender identification performance as indexed by the percentage of correct gender identification (A) and reaction time (B) while implicitly processing facial stimuli during the acquisition of fMRI. No significant main effect of emotional valence (p = 0.59) or drug treatment (p = 0.96) or an interaction (p = 0.23) between emotional valence and drug treatment on the ability of participants to distinguish male and female faces. Significant effect of emotional valence (neutral vs fearful) (F = 4.32, d.f. = 1, p = 0.038) and drug condition (F = 12.30, d.f. = 1, p < 0.001) on reaction time. No significant effect of interaction (F = 0.04, d.f. = 1, p = 0.829) between emotional valence and drug condition on response latency.