Have you heard of the idea that smiling actually makes you joyful? Perhaps you know of the experiment where researchers got people to hold a pen in their mouth, so they had to smile, and it made them find cartoons funnier. If you’re familiar with this idea, then you’re familar with the work of German psychologist Fritz Strack, who carried out the famous pen-based grinning study, back in 1988. Last year, a group of researchers published a registered replication report (RRR) – an attempt to directly reproduce the 1988 pen-in-the-mouth effect on cartoon appreciation. 17 different sets of researchers carried out identical studies in parallel around the world. The total sample size was 1,894 people. The results were firmly null: there was no evidence that the ‘smiling’ pen condition made cartoons seem funnier.Strack tried to defend his dubious result by saying that null hypotheses are uninformative. I left a comment there about the null hyp thing: Why bother to ask a yes/no question if you're going to ignore the No answers? Nevertheless, the original question deserves more attention. Two-way control of emotions definitely works. Lots of people use it. I use it sometimes. Strack was simply missing the point by using the pen. When you voluntarily set your muscles in a smile, or more importantly loosen the frown muscles, there is a direct and immediate change of emotion. It's much harder to hold a down mood when the facial muscles aren't maintaining it with a positive feedback loop. Break one side of the loop and the other side breaks. I'm not sure why holding a pen in your teeth doesn't work, but I can feel the difference. When I try it, I don't feel any of the smile muscles contracting, and I don't feel the frowners relaxing. The pen just keeps the lips separated, which isn't a smile. (Or at least it isn't part of the smile expresseme in my facial dialect.)
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