Reconsidering the Duchenne smile: Indicator of positive emotion or artifact of smile intensity?

Reconsidering the Duchenne smile: Indicator of positive emotion or artifact of smile intensity?

J.M. Girard, G. Shandar, Z. Liu, J.F. Cohn, L. Yin, L.-P. Morency. Reconsidering the Duchenne smile: Indicator of positive emotion or artifact of smile intensity? ACII 2019