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. 2019 Feb 18;13:8. doi: 10.3389/fnins.2019.00008

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Copyright © 2019 Martinez-Garcia, Bertalmío and Malo.

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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Artificial stimuli. Several texture phenomena illustrated in a single figure (see text for details). Here the tests are the 9 patterns in the gray frames. These tests increase in contrast from the frame at the left to the frame at the right. The visibility of the tests (a) nonlinearly increases with the contrast from left to right; (b) the visibility depends on the frequency of the tests, low frequency at the top panel and high frequency at the bottom panel; and (c) the visibility of the tests depends on the background (cross-masking).