When Keisuke Adachi signed up for a study at Tokyo University of Science, he probably did not expect to spend his afternoon watching stand-up comedy. But that is exactly what happened, and the results surprised even the researchers.
A team led by Professor Hiroko Ichikawa from the Institute of Arts and Sciences at Tokyo University of Science wanted to understand how people's moods affect their ability to read faces. Previous research had shown that happy people tend to interpret faces more positively, but the team wanted to dig deeper. Could simply watching something funny sharpen your ability to notice a faint smile?
To find out, they gathered 53 adults and split them into two groups. One group watched a comedy video for 20 minutes. The other watched a neutral weather forecast. After the videos ended, the researchers tested how well each group could spot subtle facial expressions in photos.
The comedy watchers performed noticeably better. They were more likely to correctly identify faint smiles in the photos they viewed, while the weather forecast group struggled more with the same task. The difference was clear: the people who felt happier after watching comedy were simply better at reading positive expressions.
"Even in daily life, facial expressions are not always obvious," Professor Ichikawa explained. "There are situations where it matters to be able to recognize a subtle change in expression, such as a faint smile."
The researchers also discovered something unexpected. When faces wore masks, this mood effect disappeared entirely. Masks cover the mouth and surrounding areas, which are key visual cues for recognizing smiles. With those areas hidden, people could no longer project their own good feelings onto the faces they were looking at.
The study, published in the journal Scientific Reports on July 20, 2026, also found that people with higher empathy skills benefited most from the comedy intervention. Specifically, people who scored high in perspective taking, which means they naturally try to understand how others think and feel, showed the strongest improvement in spotting subtle smiles.
The findings suggest a simple takeaway: surrounding yourself with things that make you laugh might actually help you connect better with the people around you. In a world where so much communication happens in person and on screens, being able to catch a fleeting expression could make the difference between misunderstanding someone and truly understanding them.
So the next time you are trying to figure out what a friend or coworker really thinks, maybe put on a funny video first. Twenty minutes of laughter might be all it takes to read the room a little better.