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. 2015 Sep 15;6:1381. doi: 10.3389/fpsyg.2015.01381

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Copyright © 2015 Marquardt, Cross, de Sousa, Edelstein, Farnè, Leszczynski, Patterson and Quadflieg.

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) or licensor 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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Illustration of the role of geometric cues in transparency detection. (A) Opaque square and circle, with T-junctions marked by dashed circles. (B) Transparent square and circle, with X-junctions marked by dashed circles. Source: From Hillstrom et al. (2013). Copyright 2013 American Psychological Association; reprinted by permission.