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. 2019 Dec 18;9:19399. doi: 10.1038/s41598-019-55350-0

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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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Reaction time differences found for SR and OR recognition in Mnemonic Discrimination task and to a lesser extent in the Match-to-Sample task. (A) Race (p < 0.05) and correctness (p < 0.005) significantly affect reaction time means in the mnemonic discrimination test, however there is no interaction of the two. A post hoc multiple comparisons test finds reaction time differences are associated with accuracy for OR but not SR face discriminations, where longer responses are linked to correct discriminations. (The main effect of race and post-hoc comparisons are labeled on figure A as * and ***, respectively). (B) An analogous analysis of variance of the Match-to-Sample data finds only a main effect of correctness on reaction time (p < 0.05) However, a post-hoc test finds reaction times are associated with accuracy for OR but not SR faces (p < 0.05), where quicker responses are linked to accuracy. (The post-hoc comparisons are labeled on figure B as *).