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. 2019 Apr 18;9:6255. doi: 10.1038/s41598-019-42764-z

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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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Basic eye movement metrics. (A) Examples of the visual stimuli, fixation maps of each age group, and difference maps. In the difference maps, bright regions attract more fixations from the 30-month-olds, while dark regions attract more fixations from the 18-month-olds. (B,C) Significant differences between age groups were observed. (B) 30-month-olds had more fixations than 18-month-olds. (C) 30-month-olds had shorter average fixation durations than 18-month-olds.