Tearing: Breakthrough in human emotional signaling
Provine, Krosnowski and Brocato, Evolutionary Psychology 7(1), 2009. Sad faces with and without digitally removed tears: faces without tears rated as less sad, some read as awe, concern or puzzlement. Authors suggest tears resolve ambiguity. Emotional tearing may be unique to humans and may not appear until several months after birth; many animals tear for eye lubrication.
Provine, Krosnowski and Brocato, Evolutionary Psychology 7(1), 2009. Sad faces with and without digitally removed tears: faces without tears rated as less sad, some read as awe, concern or puzzlement. Authors suggest tears resolve ambiguity. Emotional tearing may be unique to humans and may not appear until several months after birth; many animals tear for eye lubrication.
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Provine, R. R., Krosnowski, K. A., & Brocato, N. W. (2009). Tearing: Breakthrough in human emotional signaling. Evolutionary Psychology, 7(1). doi:10.1177/147470490900700107 https://doi.org/10.1177/147470490900700107