Do facial muscles track story empathy or moral judgment?
When reading stories, our facial muscles do not just mirror a character's feelings; they also reflect our own moral judgments of whether that character deserves what happens to them.
Source
Emotion in Stories: Facial EMG Evidence for Both Mental Simulation and Moral Evaluation
What they did
The researchers conducted a within-subjects study with 60 Dutch university students who read 64 short narratives. They manipulated whether a story's protagonist acted morally or immorally, and whether a subsequent event that befell them was positive or negative. While students read, facial electromyography (EMG) recorded real-time muscle activity in the corrugator supercilii (frowning muscle).
What they found
Participants frowned significantly more in response to immoral actions than moral ones. When something bad happened to a moral character, frowning increased, whereas a positive event reduced frowning. However, when events befell immoral characters, the expected differences in frowning disappeared entirely, indicating that language-driven simulation and moral evaluation conflicted and canceled each other out.
The limits
What it doesn't show
The study cannot determine the exact cognitive mechanism of the conflict, such as whether simulation was completely blocked or if opposing emotional signals simply canceled each other out in the muscle response. Additionally, the findings are limited by a highly homogeneous sample of mostly female university students tested in a laboratory setting, which may not represent how diverse populations read stories. Finally, because sentences were not presented word-by-word, the design cannot map the precise, millisecond-by-millisecond timeline of when simulation ends and evaluation begins.
Key terms
- Facial electromyography (EMG)
- A technique used to measure electrical activity generated by facial muscle movements, reflecting micro-expressions of emotion.
- Corrugator supercilii
- The frowning muscle located near the eyebrow, which typically contracts during negative emotions or high mental effort.
- Mental simulation
- The cognitive process of mentally reenacting sensory, motor, or emotional experiences described in language to understand their meaning.
- Moral evaluation
- The cognitive and emotional judgment of whether an action or outcome is fair, right, or socially acceptable.
- Situation model
- A mental representation of the people, events, and relationships described in a narrative, updated continuously as a reader progresses through a text.
- Schadenfreude
- A positive emotional reaction or pleasure derived from another person's misfortune, especially when that person is disliked.
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Quiz yourself
What is the primary function of the corrugator supercilii muscle in facial electromyography (EMG) research?
Common questions
Why did the researchers measure the frowning muscle instead of the smiling muscle?
The corrugator (frowning) muscle is a highly sensitive and reliable indicator of emotional valence, whereas the zygomaticus (smiling) muscle can be activated by complex emotions like sarcasm, smirking, or social masking, making it harder to interpret.
What does the 'multiple-drivers account' mean for how we read books?
It means that reading is an active, personal process; we do not passively absorb a character's feelings, but instead continuously evaluate what happens to them based on our own moral codes.
Did individual empathy levels affect how people responded to the stories?
Yes, participants with higher affective empathy scores frowned more intensely at immoral actions and unfair events, showing that personal traits influence our physical reactions to text.
How do the researchers know the frowning wasn't just caused by processing difficulty?
Frowning muscle activity did not increase during the most complex, conflicting situations (immoral characters facing events), but did increase during simple, negative events happening to good characters, ruling out mental effort as the main explanation.
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