A posed smile may briefly improve a person’s mood, but requiring that expression repeatedly — especially under the threat of a financial penalty — can make people feel worse, according to a University of Florida-led experiment. The findings add a real-world qualification to laboratory research suggesting that facial expressions can influence emotion.
Psychologist Nicholas Coles and co-authors Annabel Dang and Joao Francisco Goes Braga Takayanagi designed the study to resemble the emotional demands placed on customer-service workers. Earlier experiments generally asked participants to make an expression once in a controlled setting. The new work added repetition and pressure, two features common in jobs where employees are expected to appear cheerful throughout a shift.
The researchers recruited 1,201 people for an online experiment, with 1,174 included in the final analysis. Participants viewed pleasant images, such as kittens and flowers, or unpleasant images involving subjects including theft and animal mistreatment. They were instructed either to smile or to let their faces respond naturally, and they completed the task once or ten times.
Half of the participants were told that failing to follow the smiling instruction could reduce their $6 payment by $2. Everyone ultimately received the full amount. Participants rated their happiness after each task, allowing the researchers to compare the effects of the image, expression, repetition and perceived financial pressure.
A single posed smile produced a small improvement when people were viewing unpleasant images, including among participants who thought their payment was at risk. That benefit weakened when the smile was repeated. Combining repeated smiles with the financial warning eliminated the improvement.
The pattern differed with pleasant images. A single voluntary smile did not materially improve mood, while repeated or pressured smiling left participants less happy than allowing a natural response. Additional analysis linked forced smiling in those conditions with greater irritation and anger. The study was published October 1 in the *Journal of Experimental Social Psychology*.
The results do not overturn earlier evidence that facial movement can affect feelings. Instead, they suggest that context determines whether the effect helps. A brief, self-directed expression and a workplace rule requiring constant cheerfulness are psychologically different experiences. Pressure can also reduce a worker’s sense of autonomy, while repetition turns a small gesture into sustained emotional labor.
That distinction matters for employers considering scripted-smile policies. The experiment cannot reproduce every customer interaction or establish the long-term effects of such rules, but it indicates that demanding visible happiness may undermine the mood it is intended to create. A smile can still provide a modest lift; making it compulsory and repetitive may produce the opposite result.
