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. 2017 Nov 8;7:15094. doi: 10.1038/s41598-017-15378-6

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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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Visual stimuli used in the categorization task. (a) Six examples of different objects being grasped. (b–e) Six examples each of the different non-grasping motor acts: finger touch front (b), mimicked grasp (c), fist touch (d), finger touch side (e). (f) Frames of a grasping motor act: grasping videos showed a human hand approaching from the right and grasping a centrally-positioned object, after which the hand released the object and moved out of the frame. Monkeys were required to fixate the central small red spot superimposed on the video. (g) Frames of a non-grasping motor act: the non-grasping videos showed a human hand approaching from the right and touching the table without interacting with the object. In this example of a finger touch motor act, a finger touched the surface in front of the object, after which the hand moved out of sight.