«The face remains the best window we have on moment - to - moment changes in emotional response,» says Paul Ekman, a psychologist who, in 1978, co-published the Facial Action Coding System, a seminal, 527 - page reference tome of
every possible facial muscle movement and how it maps to seven fundamental emotions (happiness, sadness, surprise, fear, anger, disgust, and contempt).
We're not advising you to boycott smiling, but if you have a habit of constantly moving your
facial muscles — think: furrowing your brow or raising your forehead
muscles — try to lessen it when
possible.