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. 2020 Oct 15;10:17372. doi: 10.1038/s41598-020-74057-1

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Time structure of each trial of the visual delayed matching-to-sample task learned by two rhesus macaques¹⁶. Monkeys fixated for 0.5 s, then two images were displayed in the periphery of their visual field for 0.3 s each, with a 0.8–1.2 s blank period in between. Macaques were then given 1.5 s to respond whether or not the identical images had matching orientations.