From using a smiling emoji in messages to saying "cheese" when taking photos,most people believe that a smile is a sign of happiness. 1 some scientists don't think so. The2 between smiles and happiness was recently studied by researchers at Brighton and Sussex Medica School (BSMS) in the UK. Their3 found that smiling doesn't necessarily show a person's gladness. Instead, it can usually 4 a tool in social contact. In the study, 44 people aged between 18 and 35 took part in a quiz. The 5 had to answer nine difficult questions, while their facial expressions were recorded by computers. The participants were then asked to rate（评估）their own experiences when answering the questions. They were given 12 different emotions to 6 including "bored" and "interested". According to Science Daily, people always 7 the experiences that made them smile with ＂engagement（参与）＂， 8 ＂happiness＂ or ＂interested＂. We normally associate a smiling person with cheerfulness. 9 ,a smile is more likely to be caused by a feeling of10 reported Indian newspaper The Asian Age. In order to 11 explain these results, the researchers checked the12 of the participants answering each question. According to the journal News Medical,the participants didn't show any signs of smiling in their images when they were trying their best to find out the right answer. However, when they were told whether their answer was13 or not, they smiled. And more 14 they smiled more often when their answers were incorrect. It showed "their enjoyment of this game, "according to Science Daily. "This 15 could be explained by self-ratings of engagement, rather than by ratings of happiness or frustration," body language expert Harry Witchel told Science Daily.
