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. 2015 Jul 20;6:922. doi: 10.3389/fpsyg.2015.00922

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Copyright © 2015 Ravicz, Perdue, Westerlund, Vanderwert and Nelson.

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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Experimental design. (A) Example ‘happy’ stimulus. Each trial consists of five images like this one, with different female models portraying a happy expression. (B) Each trial includes five images, each presented for 1 s with a 200–400 ms inter-stimulus time. The five images in a trial represent a single emotional category (fearful, happy, or angry), with five different female models portraying the emotional expression. After the fifth image, a 10 s inter-trial video is shown, for a total trial time of about 16 s. The experiment consists of 30 total trials, with 10 trials of each emotional category.