1. Abel E. and Kruger M. (2010) Smile Intensity in Photographs Predicts Longevity, Psychological Science, 21, 542–544. – On smiling as helping us live longer.
  2. Béres, András, et al. ““Does happiness help healing?” Immune response of hospitalized children may change during visits of the Smiling Hospital Foundation’s Artists.” Orvosi hetilap 152.43 (2011): 1739-1744. – On smiling strengthening the immuse system.
  3. Ekman, Paul, Richard J. Davidson, and Wallace V. Friesen. “The Duchenne smile: Emotional expression and brain physiology: II.” Journal of personality and social psychology 58.2 (1990): 342. – On the initial facial research.
  4. Emoto, Masaru. The hidden messages in water. Simon and Schuster, 2011. – On how our thoughts affect us, as we’re 60% water.
  5. Federation of American Societies for Experimental Biology (FASEB). “Fight memory loss with a smile (or chuckle).” ScienceDaily. ScienceDaily, 27 April 2014. – On how smiling helps with memory loss.
  6. Hatfield, Elaine; Cacioppo, John T.; Rapson, Richard L. Clark, Margaret S. (Ed), (1992). Primitive emotional contagion. Emotion and social behavior. Review of personality and social psychology, Vol. 14., (pp. 151-177). Thousand Oaks, CA, US: Sage Publications, Inc, xi, 311 pp. – On smiling as infectious/contagious.
  7. Kraft, Tara L., and Sarah D. Pressman. “Grin and bear it: The influence of manipulated facial expression on the stress response.” Psychological science 23.11 (2012): 1372-1378. – On how faking a smile tricks the brain into believing you’re feeling good.
  8. O’Doherty, John, et al. “Beauty in a smile: the role of medial orbitofrontal cortex in facial attractiveness.” Neuropsychologia 41.2 (2003): 147-155. – On how facing someone smiling triggers the sense of feeling rewarded.
  9. Reis, Harry T., et al. “What is smiling is beautiful and good.” European Journal of Social Psychology 20.3 (1990): 259-267. – On smiling making us more attractive.
  10. R.D. (2000). Neural correlates of conscious emotional experience. In R.D. Lane & L. Nadel (Eds.), Cognitive neuroscience of emotion (pp. 345–370). New York: Oxford University Press. – On how smiling releases the “feel-good” neurotransmitters, specially endorphins, which act as painkillers.
  11. Seaward, Brian Luke. Managing stress: Principles and strategies for health and wellbeing. Jones & Bartlett Pub, 1999. – On smiling releasing the “feel-good” neurotransmitters, activating the release of neuropeptides.
  12. Sonnby–Borgström, M. (2002), Automatic mimicry reactions as related to differences in emotional empathy. Scandinavian Journal of Psychology, 43: 433–443 – On how we mimic and empathize when we see a facial expression.
  13. Sonkin, Daniel. “Mirroring People: The Science of Empathy and How We Connect With Others.” Partner Abuse 4.2 (2013): 287-291. – On smiling being contagious.
  14. Strack F, Martin LL, Stepper S. “Inhibiting and facilitating conditions of the human smile: a nonobtrusive test of the facial feedback hypothesis”. J Pers Soc Psychol. 1988 May;54(5):768-77. doi: 10.1037//0022-3514.54.5.768. PMID: 3379579. On how holding a pen with the mouth can contribute to feeling better.
  15. Tsai, Ya-Yun. “Is service with a smile enough? The effects of emotional labor on customer outcomes: The moderating roles of service sweethearting and customer-directed impression management.” (2014). – On how smiling contributes to a positive evaluation and feedback.
  16. Wild, Barbara, et al. “Why are smiles contagious? An fMRI study of the interaction between perception of facial affect and facial movements.” Psychiatry Research: Neuroimaging 123.1 (2003): 17-36. – On smiling as contagious.

Please email me references that you believe should be here included, this is a work-in-progress.