Asymmetries of expressive facial movements during experimentally induced positive vs. negative mood states: A video-analytical study

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Abstract
When reviewing the literature, it appears that the striking disparity among findings concerning facial expression asymmetry may be due to inconsistent experimental settings. In our study we applied a set of standard mood induction procedures within a semi-standardised face-to-face interview. We predicted a greater right-sided lifting of the corners of the mouth during positive mood states and a greater left-sided lowering during negative mood states. The results were in line with our expectations. Our interpretation attempts to reconcile the “right hemisphere hypothesis” and the “valence hypothesis” of emotional processing.