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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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Visualization of DL features. (A) Visualization of the DL feature channels sorted into columns corresponding to classification weights. The lowest weights (row 1) correspond to 18-month-olds and the highest weights (row 2) correspond to 30-month-olds. Image patches represent features that are most characteristic of looking patterns for each age group across all fixations. (B) Visualization and classification weights of the DL features corresponding to each feature from Fig. 2B. Features that most strongly correlate with the labeled semantic features are presented. Bars indicate the evolution of classification weights across fixations. Higher classification weights suggest that 30-month-olds are more likely to fixate the feature than 18-month-olds. Note: for privacy reasons, faces are blocked in this Figure. Faces were intact in the original stimuli viewed by participants.