A multi-lab test of the facial feedback hypothesis by the Many Smiles Collaboration.

Following theories of emotional embodiment, the facial feedback hypothesis suggests that individuals' subjective experiences of emotion are influenced by their facial expressions. However, evidence for this hypothesis has been mixed. We thus formed a global adversarial collaboration and carried out a preregistered, multicentre study designed to specify and test the conditions that should most reliably produce facial feedback effects. Data from n = 3,878 participants spanning 19 countries indicated that a facial mimicry and voluntary facial action task could both amplify and initiate feelings of happiness. However, evidence of facial feedback effects was less conclusive when facial feedback was manipulated unobtrusively via a pen-in-mouth task.

Your Face and Moves Seem Happier When I Smile.

In this experiment, we replicated the effect of muscle engagement on perception such that the recognition of another's facial expressions was biased by the observer's facial muscular activity (Blaesi & Wilson, 2010). We extended this replication to show that such a modulatory effect is also observed for the recognition of dynamic bodily expressions. Via a multilab and within-subjects approach, we investigated the emotion recognition of point-light biological walkers, along with that of morphed face stimuli, while subjects were or were not holding a pen in their teeth. Under the "pen-in-the-teeth" condition, participants tended to lower their threshold of perception of happy expressions in facial stimuli compared to the "no-pen" condition, thus replicating the experiment by Blaesi and Wilson (2010). A similar effect was found for the biological motion stimuli such that participants lowered their threshold to perceive happy walkers in the pen-in-the-teeth condition compared to the no-pen condition. This pattern of results was also found in a second experiment in which the no-pen condition was replaced by a situation in which participants held a pen in their lips ("pen-in-lips" condition). These results suggested that facial muscular activity alters the recognition of not only facial expressions but also bodily expressions.

On the activation of sensorimotor systems during the processing of emotionally-laden stimuli / Sobre la activación de sistemas sensorimotores durante el procesamiento de estímulos emocionalmente cargados

A series of experiments were devised to test the idea that sensorimotor systems activate during the processing of emotionally laden stimuli. In Experiments 1 and 2 participants were asked to judge the pleasantness of emotionally laden sentences while participants held a pen in the mouth. Experiments 3 and 4 were similar to the previous experiments, but the experimental materials were emotionally laden images. In Experiment 5 and 6 the same bodily manipulation used throughout the previous experiments was kept while participants judged facial expressions. The first pair of experiments replicated findings suggesting that sensorimotor systems are activated during the processing of emotionally laden language. However, follow-up experiments suggested that dual activation of both perceptual and motor systems is not always necessary. For the particular case of emotionally laden stimuli, results suggested that the perceptual system seems to drive the processing. It is also shown that a high resonance between sensorimotor properties afforded by the stimuli and the sensorimotor systems activated in the cogniser elicit emotional states. The results invite to review radical versions of embodiment accounts and rather support a graded-embodiment view.

Una serie de experimentos fueron diseñados para determinar si sistemas sensoriomotores se activan durante el procesamiento de estímulos con contenido emocional. En los experimentos 1 y 2, los participantes juzgaron cuan emocionales eran ciertas frases con contenido emocional mientras sostenían un lápiz en la boca. Los experimentos 3 y 4 fueron similares a los anteriores con la diferencia de que los materiales experimentales fueron imágenes con contenido emocional. En los experimentos 5 y 6 la misma manipulación facial fue usada mientras los participantes juzgaban expresiones faciales. El primer par de experimentos replicó estudios anteriores demostrando que sistemas sensoriomotores se activan durante el procesamiento de lenguaje con contenido emocional. Sin embargo, los experimentos subsecuentes sugirieron que la activación de sistemas perceptuales y motores no siempre son necesarios. Para el caso específico de estímulos con contenido emocional, los resultados sugirieron que el sistema perceptual está a cargo del procesamiento. También se argumenta que una resonancia alta entre los sistemas sensoriomotores asociados a los estímulos y los sistemas sensoriomotores activados en el participante, conllevan a la elicitación de estados emocionales. Los resultados invitan entonces a revisar versiones radicales de las teorías de la cognición corporeizada y en cambio sugieren adoptar versiones en las que existen grados de corporeidad.