Abstract:
:When we feel sad or depressed, our face invariably "drops". Conversely, when we try to cheer someone up, we might tell them "keep your smile up", so presupposing that modifying the configuration of their facial muscles will enhance their mood. A crucial assumption that underpins this hypothesis is that mental states are shaped by information originating from the peripheral neuromotor system - a view operationalised as the Facial Feedback Hypothesis. We used botulinum toxin (BoNT-A) injected over the frown area to temporarily paralyse muscles necessary to express anger. Using a pre-post treatment design, we presented participants with gradually changing videos of a face morphing from neutral to full-blown expressions of either anger or happiness and asked them to press a button as soon as they had detected any change in the display. Results indicate that while all participants (control and BoNT-A) improved their reaction times from pre-test to post-test, the BoNT-A group did not when detecting anger in the post-test. We surmise that frown paralysis disadvantaged participants in their ability to improve the detection of anger. Our finding suggests that facial feedback causally affects perceptual awareness of changes in emotion, as well as people's ability to use perceptual information to learn.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Bulnes LC,Mariën P,Vandekerckhove M,Cleeremans Adoi
10.1038/s41598-019-48275-1subject
Has Abstractpub_date
2019-08-13 00:00:00pages
11734issue
1issn
2045-2322pii
10.1038/s41598-019-48275-1journal_volume
9pub_type
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