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. 2018 Oct 26;9:2052. doi: 10.3389/fpsyg.2018.02052

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Copyright © 2018 Calvo, Fernández-Martín, Recio and Lundqvist.

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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Distribution of AU evidence scores across levels of expressive intensity. For each expression, AUs were selected if scores were higher than for the neutral face (NE, or 0% expression intensity) and were positive and above the 0 AU activation baseline. AU1: inner brow raiser; AU2: outer brow raiser; AU4: brow lowerer; AU5: upper lid raiser; AU6: cheek raiser; AU7: lid tightener; AU9: nose wrinkle; AU10: upper lip raiser; AU12: lip corner puller; AU15: lip corner depressor; AU25: lips part; AU26: jaw drop. (A) Happiness; (B) Surprise; (C) Anger; (D) Sadness; (E) Disgust; (F) Fear.