
Psychology research is not generally very good at capturing change. Measurements tend to be fairly static, either looking at one slice of time or asking participants to average over a period. Which is why this research on smiling is so unusual. Some of the best known research on smiling is about how people judge an authentic smile – the so-called ‘Duchenne smile’ or the ‘crinkly-eyed smile’. What this research asks, though, is how does a smile’s speed in combination with head-tilt and gender affect its perception.






