Here is a possible mechanism ..

Andreas Hennenlotter, Christian Dresel, Florian Castrop, Andres O. Ceballos-Baumann, Afra M. Wohlschläger, Bernhard Haslinger, The Link between Facial Feedback and Neural Activity within Central Circuitries of Emotion—New Insights from Botulinum Toxin–Induced Denervation of Frown Muscles, Cerebral Cortex, Volume 19, Issue 3, March 2009, Pages 537–542,

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