Brinke and others established that participants appeared surprised because they could only raise their eyebrows when trying to appear sad, which then caused the participants to feel embarrassed, feel genuine happiness, and let a smile slip.
Brinke e outros estableceron que os participantes parecían sorprendidos porque só podían levantar as súas cellas cando trataban de parecer tristes, o que causou nos participantes vergoña, sentir felicidade xenuína e deixar un sorriso.