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. 2014 Nov 18;5:1306. doi: 10.3389/fpsyg.2014.01306

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Copyright © 2014 Hofmann.

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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Mean intensity ratings and standard error bars (2±) for Duchenne laughs and laughs with added eyebrow-lowering furrows (FAIM) in three intensities (low, medium, high).