Do fearful faces slow our actions only when emotion matters?
People were slower and made more errors when a fearful face, rather than a happy one, told them to move, but only when they were judging emotion; when judging gender the difference disappeared.
Source
The Weight of Emotions in Decision-Making: How Fearful and Happy Facial Stimuli Modulate Action Readiness of Goal-Directed Actions
Study at a glance
- Design
- Human experiment — Within-subject: the same fearful, happy and neutral faces served as go/no-go cues in an emotion-discrimination task (move to emotional faces) and a gender-discrimination task (move by face gender), order counterbalanced.
- N
- N=40 · 40 right-handed adults (20 men) completed both tasks.
- Population
- Healthy right-handed young adults in Rome
- Outcome
- Reaching reaction time and error rate on go trials cued by fearful versus happy faces
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Forty adults did a touchscreen reaching task in which a face photo signalled whether to reach to a target (go) or hold still (no-go). In one task they reached for fearful or happy faces and held still for neutral ones, so emotion was relevant; in the other task, using the same faces, they reached based on whether the face was male or female, so emotion was irrelevant. Fearful and happy faces were checked to be equally arousing.
What they found
When emotion was task-relevant, reaching started 15.3 ms later on average after fearful faces than after happy faces, a large effect, and more errors occurred after fearful faces. In the gender task, fearful and happy faces produced no reliable difference in speed or errors. The author interprets this as fearful faces capturing and holding attention and interfering with action planning, but only when their emotional meaning is attended.
The limits
What it doesn't show
The sample was small, young and healthy, and only four actors and two emotions (fear and happiness) were used, so it is unclear whether anger or other expressions behave the same. Eye movements were not recorded, so the claim that people inspect faces differently across tasks, and the attention-capture explanation, are untested. The absolute effect is a few milliseconds in a highly controlled lab task, and the author notes the finding needs replication.
Key terms
- Go/no-go task
- A task where one class of stimuli signals a response (go) and another signals withholding it (no-go), measuring readiness and inhibition.
- Task relevance
- Whether a stimulus feature (here, facial emotion) must be used to perform the task or can be ignored.
- Arousal vs valence
- Arousal is how intense or activating a stimulus is; valence is whether it feels positive or negative.
- Reaction time (RT)
- The time from the go signal to the start of the movement.
- Attentional bias to threat
- The tendency for threatening stimuli to grab and hold attention more strongly than neutral or positive ones.
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Quiz yourself
When were reaching responses slower after fearful than happy faces?
Common questions
Why include a gender-discrimination task?
It used exactly the same faces, so any difference between fearful and happy faces that appears only in the emotion task cannot be due to the pictures' low-level features or to individual differences.
Why did the author match fearful and happy faces on arousal?
So that any slowing after fearful faces reflects their negative valence rather than simply being more intense or exciting.
Does this mean fear is never processed automatically?
No. The author says brain systems may process threat automatically, but a reliable behavioural effect on reaching appeared only when emotion was task-relevant.
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