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. 2018 Aug 29;9:1439. doi: 10.3389/fpsyg.2018.01439

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Copyright © 2018 Viengkham and Spehar.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Synthetic fractal stimuli used for Experiment 1. Image types shown from top to bottom are grayscale, thresholded, and edges with the average fractal dimension D of 0.978 (left), 1.710 (middle), and 2.030 (right), respectively.