In a recent mimicking study at the University of Clermont-Ferrand in France, subjects were asked to determine whether a smile was real or fake while holding a pencil in their mouth to repress smiling muscles.
Di penelitian meniru senyum baru-baru ini di Universitas Clermont-Ferrand di Perancis, subjek diminta untuk menentukan keaslian sebuah senyum sambil menahan sebuah pensil di mulut mereka untuk menahan otot senyuman.