Facial Feedback Hypothesis

The facial feedback hypothesis, rooted in the ideas of Charles Darwin and William James, holds that a person's facial expression directly affects their emotional experience, so that physiological activation of the facial muscles associated with a given emotion has a direct effect on the emotional state that follows, while the absence or inhibition of that facial activation suppresses or eliminates the corresponding emotion. Researchers distinguish a strong version of the hypothesis, in which facial feedback is the decisive factor in whether an emotion is felt at all, from a weak version, in which facial expression plays only a limited role in shaping the resulting feeling, and only the weak version has received substantial support, leading most researchers to conclude that facial expression has a minor facilitative effect on emotional experience; a 2019 meta-analysis confirmed small but significant effects overall, finding they were larger in the absence of other emotional stimuli, which suggests facial feedback plays more of an initiating than a modulating role. Further evidence that facial feedback is not essential to feeling an emotion comes from studies of people with facial paralysis, whose emotional experience did not significantly differ from that of participants without the condition, despite their inability to produce the corresponding facial expression.