AP® Psychology · Unit 4 · Topic 4.7
Facial Feedback and Broaden-and-Build
The facial feedback hypothesis says making a facial expression can itself produce the matching emotion, not just express one already felt. Positive emotions then broaden attention and build resources, while negative emotions narrow focus.
Normally we assume emotion causes expression: you feel happy, so you smile. The facial feedback hypothesis runs that arrow backward too. It claims the physical configuration of your facial muscles sends signals back to the brain that shape what you feel. Force your face into a smile shape and the brain reads that signal as a cue toward amusement or happiness, nudging your actual mood upward, even if nothing funny has happened yet.
This connects to broaden-and-build theory, which describes what positive and negative emotions do to attention once they occur. Positive emotions like joy or curiosity widen your attention, letting you notice more options, make looser associations, and explore, which over time builds lasting resources like skills, relationships, and resilience. Negative emotions like fear do the opposite: they narrow attention sharply onto the immediate threat, useful for fast survival action but costly for creative or flexible thinking. A relaxed, smiling face supports broadened attention, while a tense, frowning face supports narrowed, vigilant attention.
The classic demonstration of facial feedback had participants hold a pen sideways in their teeth, forcing a smile-like shape, versus holding it with lips only, which blocks a smile. Pen-in-teeth participants rated cartoons funnier. But later researchers running careful, large-scale replications of this exact study often found a much weaker effect or none at all. This does not erase the broader idea of facial feedback, but it is a reminder that even famous findings need repeated testing, and confidence in a result should track the weight of accumulated evidence, not just one striking original study.
Key terms
- Facial feedback hypothesis
- The idea that facial muscle movements can themselves generate or intensify the emotion that matches that expression.
- Broaden-and-build theory
- The theory that positive emotions widen attention and thinking while building lasting personal resources over time.
- Replication
- Repeating a study's methods to see whether the original result holds up under new, independent testing.
- Narrowing of attention
- The way negative emotions like fear focus attention tightly on an immediate threat at the cost of broader awareness.
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End of topic.