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. 2019 Jul 17;9:10355. doi: 10.1038/s41598-019-46705-8

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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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(a) Box and whisker plot showing proportion of responding to non-social stimuli (geometric images) when presented with social human stimuli (adults’ faces) for ASD and TD children. (b) Mean number of responses per session for non-social (geometric images) and human social stimuli (adults’ faces). (c) Box and whisker plot showing proportion of responding to non-social stimuli (geometric images) when presented with social nonhuman stimuli (dogs’ faces) for ASD and TD children. (d) Mean number of responses per session for non-social (geometric images) and nonhuman social stimuli (dogs’ faces). (e) Box and whisker plot showing proportion of responding to non-social stimuli when social and nonsocial stimuli were presented in a single choice arrangement using a progressive ratio reinforcement schedule. (f) Proportion of responding to non-social (geometric images) when reinforcement strength during the progressive ratio schedule was measured as session length. (g) Preference for non-social stimuli when reinforcement strength during the progressive ratio schedule was measured as the schedule breakpoint.