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. 2018 Jul 23;9:1154. doi: 10.3389/fpsyg.2018.01154

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Copyright © 2018 Berdica, Gerdes, Bublatzky, White and Alpers.

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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Examples of experimental category combinations, trial sequences, and block order counterbalanced across participants. (Block A) Spiders and butterflies, (Block B) angry and neutral faces, (Block C) spiders and angry faces, and (Block D) butterflies and neutral faces. The codes for the KDEF faces used in the figure are: am10nes, am10ans, am21ans, am21nes, am23nes, am24ans, bm10nes, bm23nes, bm31ans, and bm31nes.