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Duchenne Smile, Emotional Experience, and Autonomic Reactivity: A Test of the Facial Feedback Hypothesis

American Psychological Association
Emotion
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Abstract

This study examined the modulatory function of Duchenne and non-Duchenne smiles on subjective and autonomic components of emotion. Participants were asked to hold a pencil in their mouth to either facilitate or inhibit smiles and were not instructed to contract specific muscles. Five conditions—namely lips pressing, low-level non-Duchenne smiling, high-level non-Duchenne smiling, Duchenne smiling, and control—were produced while participants watched videoclips that were evocative of positive or negative affect. Participants who displayed Duchenne smiles reported more positive experience when pleasant scenes and humorous cartoons were presented. Furthermore, they tended to exhibit different patterns of autonomic arousal when viewing positive scenes. These results support the facial feedback hypothesis and suggest that facial feedback has more powerful effects when facial configurations represent valid analogs of basic emotional expressions.
Duchenne Smile, Emotional Experience, and Autonomic
Reactivity: A Test of the Facial Feedback Hypothesis
Robert Soussignan
Hoˆpital de la Salpeˆtrie`re
This study examined the modulatory function of Duchenne and non-Duchenne
smiles on subjective and autonomic components of emotion. Participants were
asked to hold a pencil in their mouth to either facilitate or inhibit smiles and were
not instructed to contract specific muscles. Five conditions—namely lips pressing,
low-level non-Duchenne smiling, high-level non-Duchenne smiling, Duchenne
smiling, and control—were produced while participants watched videoclips that
were evocative of positive or negative affect. Participants who displayed Duchenne
smiles reported more positive experience when pleasant scenes and humorous
cartoons were presented. Furthermore, they tended to exhibit different patterns of
autonomic arousal when viewing positive scenes. These results support the facial
feedback hypothesis and suggest that facial feedback has more powerful effects
when facial configurations represent valid analogs of basic emotional expressions.
The human face has long been recognized as a
powerful signaling system serving both inter- and in-
traindividual regulatory functions. Implicit in such a
view is the assumption that facial behavior constitutes
not only the expressive output of inner emotional
states or social motives but also an input to the sub-
jective experience of emotion. The idea that afferent
feedback from expressive behavior may play a causal
role in the experience of emotion takes its roots in part
from Charles Darwin’s and William James’s state-
ments. Darwin (1872/1965) claimed that the intensity
of emotional experience could be regulated by en-
hancing or inhibiting the expression, whereas James
(1890) proposed that subjective feeling was the result
of peripheral bodily changes (i.e., visceral and striated
muscle activity) that directly follow the perception of
the eliciting event. The influence of these views can
be seen in more recent theories of emotion, which
assign to facial expression a primary role in the sub-
jective experience of emotion (Izard, 1971; Tomkins,
1962). This gave rise to the so-called facial feedback
hypothesis (FFH), which stated that facial movement
could influence emotional experience (Tourangeau &
Ellsworth, 1979).
In the course of empirical investigation of the FFH,
several variants of this hypothesis have been distin-
guished. First, Tourangeau and Ellsworth (1979)
raised three questions derived from the FFH: (a) Is an
appropriate facial expression necessary for the sub-
jective experience of emotion? (necessity hypothesis);
(b) Is a facial expression sufficient to produce an emo-
tional experience, even in the absence of an evocative
event? (sufficiency hypothesis); and (c) Does the
strength of a facial expression covary positively with
the intensity of emotional experience? (monotonicity
hypothesis). Whereas the view that facial displays are
necessary for experiencing emotion has not been sup-
ported (e.g., Ferna´ndez-Dols & Ruiz-Belda, 1995;
Hess, Kappas, McHugo, Lanzetta, & Kleck, 1992),
there is substantial evidence in favor of the suffi-
ciency and monotonicity hypotheses (see Hess et al.,
1992; McIntosh, 1996).
Although the several variants of the FFH do not
necessarily imply causality between face and emo-
tion, they all postulate that facial action can initiate
(sufficiency hypothesis) and/or modulate the subjec-
tive experience of emotion (Adelmann & Zajonc,
1989; McIntosh, 1996). The initiation hypothesis
I thank Nathalie Fontaine for her assistance in the data
collection. I am grateful to Patrick Mollaret for helpful com-
ments concerning the design of this research. I also thank
Paul Gendreau, Benoist Schaal, and Rita Compatangelo for
valuable comments on an earlier version of this article.
Correspondence concerning this article should be ad-
dressed to Robert Soussignan, Laboratoire Vulne´rabilite´,
Adaptation et Psychopathologie, CNRS UMR 7593, Pavil-
lon Cle´rambault, Hoˆ pital de la Salpeˆtrie`re, 47, Bd de
l’Hoˆpital, 75013 Paris, France. E-mail: soussign@ext.
jussieu.fr
Emotion Copyright 2002 by the American Psychological Association, Inc.
2002, Vol. 2, No. 1, 52–74 1528-3542/02/$5.00 DOI: 10.1037//1528-3542.2.1.52
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... Further, smiling reduces stress, with individuals smiling unconsciously showing lower HR during recovery from a stressful task and smaller decreases in positive affect from baseline (Ansfield, 2007;Kraft & Pressman, 2012). Similarly, Duchenne compared to non-Duchenne smiles result in higher electrodermal activity (EDA), which measures the skin's conductivity and varies with emotional arousal (Kreibig, 2010), and HR when exposed to positive stimuli (Soussignan, 2002). Disrupting facial feedback, on the other hand, can diminish physiological responses. ...
... Kapadia et al. (2019) reported symptom improvement in 10 individuals with major depression following 10-40 sessions of fNMES to ZM and OO, though their design did not include a control group. Warren (2021) found that, when weak fNMES is applied to the ZM muscle, which is responsible for lifting the corners of the mouth during a smile-an action linked with positive emotions Soussignan, 2002)individuals experienced enhanced positive feelings when looking at positive images. This highlights the potential for fNMES to be used as a tool to modulate emotional responses. ...
... We also observed differences in SCR by muscle, with a larger negative response in the ZM compared to the DAO muscle across all conditions. This may be explained by facial feedback effects-that is, the act of smiling in ZM trials resulted in an increase in happiness (as also shown by participants' ratings), enhancing the difference consistent with the FFH (Kreibig, 2010;Soussignan, 2002). This is particularly noteworthy since the image condition did not significantly influence changes in SCR. ...
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According to the facial feedback hypothesis, feedback from facial muscles can initiate and modulate a person’s emotional state. This assumption is debated, however, and existing research has arguably suffered from a lack of control over which facial muscles are activated, when, to what degree, and for how long. To overcome these limitations, we carried out a preregistered experiment including 58 participants. Facial neuromuscular electrical stimulation (fNMES) was applied to the bilateral zygomaticus major and depressor anguli oris muscles for 5 s at 100% and 50% of the participants’ individual motor threshold. After each trial, participants reported their emotional valence and intensity and levels of experienced discomfort. Facial muscle activations were verified with automatic video coding; heart rate and electrodermal activity were recorded throughout. Results showed that muscle activation through fNMES, even when controlling for fNMES-induced discomfort, modulated participants’ emotional state as expected, with more positive emotions reported after stronger stimulation of the zygomaticus major than the depressor anguli oris muscle. The addition of expression-congruent emotional images increased the effect. Moreover, fNMES intensity predicted intensity ratings, reduced HR, and skin conductance response. The finding that changes in felt emotion can be induced through brief and controlled activation of specific facial muscles is in line with the facial feedback hypothesis and offers exciting opportunities for translational intervention.
... The musculature of the face responds to emotional changes with a unique speed and sensitivity and the facial expressions associated with happiness, sadness, anger, fear, surprise, and disgust are believed to be universal. Research indicates that facial expressions are key indicators of an individual's psychomotor state [4]. ...
... The muscles that produce this smile are ultimately responsible for the display of emotions such as happiness, joy, and friendliness. Smiling plays a crucial role in reinforcing positive emotions, and the facial feedback effect from smiling is stronger when orbicularis oculi muscles are contracted [4]. However, similar to frown line formation, the contraction of the orbicularis oculi results in lateral canthal lines, often referred to as "crow's feet," which are a common treatment area for BoNT-A. ...
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Background Facial expressions profoundly influence emotional communication and well‐being. The facial feedback hypothesis suggests that facial muscle activity can reinforce or modulate emotional experiences. Botulinum toxin type A (BoNT‐A), known for its aesthetic applications, is emerging as a modulator of mood through its effects on facial musculature and feedback mechanisms. Its ability to influence mood extends beyond aesthetic improvement, offering potential therapeutic benefits in emotional regulation. Aims This literature review explores the interplay between facial anatomy, emotional expression, and the potential of BoNT‐A to enhance overall mood and well‐being, beyond aesthetic improvement. Methods A literature review was conducted using PubMed with search terms like “botulinum toxin” AND “emotion.” Relevant English‐language articles from 2000–present were selected based on their examination of BoNT‐A's influence on mood and facial feedback. Articles not in English and lacking relevance were excluded. Citation tracking was used to identify additional studies, and insights from the authors' clinical expertise further informed the review. Results A total of 46 articles were included based on their relevance to both BoNT‐A and emotional states. BoNT‐A‐induced muscle relaxation can prevent specific muscle contraction and thereby disrupt feedback loops that reinforce mood, potentially enhancing positive emotions and promoting overall wellbeing. Studies suggest that BoNT‐A injected into the glabella region can modulate amygdala activity, reduce symptoms of depression and anxiety, and strengthen overall emotional resilience. By modulating facial expressions, BoNT‐A can also enhance social interactions, increase positive emotional contagion, and contribute to a more positive self‐perception. Conclusion BoNT‐A shows promise as a novel approach to mood regulation and enhancement by altering facial feedback mechanisms. Its dual aesthetic and therapeutic benefits highlight its value in both dermatology and mental well‐being.
... This is probably due to the diverse perspectives held by SPs, medical students, and communication experts in evaluating the medical consultations. As has been previously shown, each evaluator holds a unique viewpoint that influences their assessment (66), for example SPs have been found to be less strict when rating students' performance (60). ...
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Introduction Although the importance of facial expressions for good doctor-patient communication is widely acknowledged, empirical evidence supporting this notion is scarce. We used a fine-grained, anatomically-based measure to investigate which facial expressions are displayed in (simulated) doctor-patient consultations and whether these can predict communication quality. Methods Fifty two medical students engaged in simulated doctor-patient consultations with standardized patients (SPs) and their facial expressions were analyzed using the Facial-Action-Coding-System (FACS). The quality of the communication was rated by SPs, medical students, and by communication experts. SPs also rated their level of comfort. Results The predominant facial expression being displayed by medical students was smiling. Medical students' smiling positively predicted the communication quality and level of comfort experienced by SPs. In contrast, smiling had little effect on medical students' self- and expert-assessments of communication quality. Smiling of medical students significantly predicted patient level of comfort and perceived quality of communication. This predictive power was found for genuine and for social smiles as well as for smiles displayed during speaking and during listening. Discussion Smiling seems to be a robust non-verbal behavior that has the potential to improve doctor-patient communication. This knowledge should be taken into consideration in medical training programs.
... Smiling is a particularly beneficial facial expression that can buffer cognitive and affective responses to pain while promoting resilience and selfmanagement (Finan & Garland, 2015). Research also suggests that smiling is associated with decreased experiences of acute pain and stress, as indicated by lower self-reports of pain and faster cardiovascular recovery towards resting levels of function (Fredrickson & Levenson, 1998;Levenson et al., 1990;Pressman et al., 2021;Soussignan, 2002). As such, one type of smile includes miserable smiles, which occur in the context of negative situations including acute pain (Ekman & Friesen, 1982). ...
... This procedure was originally expected to inhibit smiling and lowered the funniness ratings of a set of cartoons. The lips position has been assumed to suppresses the smile by engaging the orbicularis oris muscle, leading to lower EMG activity in the zygomaticus major and potentially increased activity in the orbicularis oris (Ekman et al., 1971;Ekman & Friesen, 1978;Hjortsjö, 1970;Izard, 1971;Soussignan, 2002). However, this is not without controversy since EMG evidence (see Oberman et al., 2007) suggest that this procedure promotes a pattern of facial muscle activation close to relaxation, having no differential activation of any muscle (levator, zygomaticus, orbicularis oris or buccionator). ...
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This reference work provides broad and up-to-date coverage of the major perspectives - ethological, neurobehavioral, developmental, dynamic systems, componential - on facial expression. It reviews Darwin's legacy in the theories of Izard and Tomkins and in Fridlund's recently proposed Behavioral Ecology theory. It explores continuing controversies on universality and innateness. It also updates the research guidelines of Ekman, Friesen and Ellsworth. This book anticipates emerging research questions: what is the role of culture in children's understanding of faces? In what precise ways do faces depend on the immediate context? What is the ecology of facial expression: when do different expressions occur and in what frequency? The Psychology of Facial Expressions is aimed at students, researchers and educators in psychology anthropology, and sociology who are interested in the emotive and communicative uses of facial expression.