Sex Differences in Self-awareness of Smiling During a Mock Job Interview

The present study examined sex differences in awareness of smiling behavior during a job interview, along with intended outcomes of false smiling. Male and female participants were assigned to the interviewee role of a mock job interview and were videotaped. Results indicate that women were more self-aware of false, but not genuine, smiling. In addition, women reported using false smiles to mask negative emotion and to appear enthusiastic more than did men. Naïve judges rated women who smiled in an attempt to mask negative emotion more harshly than men who smiled for this reason. Implications of these findings for the understanding of sex differences in smiling are discussed.     

Testosterone, Smiling, and Facial Appearance

In a study of possible links between testosterone and dominance, 119 men and 114 women provided saliva samples for testosterone assay and posed smiling and not smiling for portrait photographs. Expert judges viewing the photographs found smaller smiles among high than low testosterone men, with less zygomatic major (raising the corners of the mouth) and orbicularis oculi (raising the cheeks and crinkling around the corners of the eyes) muscle activity. Naive judges viewing individual photographs gave higher potency ratings to smiling high testosterone men than smiling low testosterone men. Naive judges viewing photographs grouped into high and low testosterone sets gave higher potency and lower goodness ratings to high than to low testosterone men, regardless of whether they were smiling. Among women, judges found only slight relationships between testosterone and facial appearance. The pattern among men of less smiling with higher testosterone levels fits with research linking testosterone to face-to-face dominance.     

Large-Scale Observational Evidence of Cross-Cultural Differences in Facial Behavior

Self-report studies have found evidence that cultures differ in the display rules they have for facial expressions (i.e., for what is appropriate for different people at different times). However, observational studies of actual patterns of facial behavior have been rare and typically limited to the analysis of dozens of participants from two or three regions. We present the first large-scale evidence of cultural differences in observed facial behavior, including 740,984 participants from 12 countries around the world. We used an Internet-based framework to collect video data of participants in two different settings: in their homes and in market research facilities. Using computer vision algorithms designed for this dataset, we measured smiling and brow furrowing expressions as participants watched television ads. Our results reveal novel findings and provide empirical evidence to support theories about cultural and gender differences in display rules. Participants from more individualist cultures displayed more brow furrowing overall, whereas smiling depended on both culture and setting. Specifically, participants from more individualist countries were more expressive in the facility setting, while participants from more collectivist countries were more expressive in the home setting. Female participants displayed more smiling and less brow furrowing than male participants overall, with the latter difference being more pronounced in more individualist countries. This is the first study to leverage advances in computer science to enable large-scale observational research that would not have been possible using traditional methods.     

Felt,false, and miserable smiles

Theoretically based distinctions linked to measurable differences in appearance are described for three smiles: felt smiles (spontaneous expressions of positive emotion); false smiles (deliberate attempts to appear as if positive emotion is felt when it isn't); and, miserable smiles (acknowledgements of feeling miserable but not intending to do much about it). Preliminary evidence supports some of the hypotheses about how these three kinds of smile differ.This research was supported by a grant (MH 11976) and a Research Scientist Award (MH 06092) from the National Institute of Mental Health. We are grateful to Maureen O'Sullivan for her suggestions on this report.     

Adult Perceptions of Positive and Negative Infant Emotional Expressions

Adults' perceptions provide information about the emotional meaning of infant facial expressions. This study asks whether similar facial movements influence adult perceptions of emotional intensity in both infant positive (smile) and negative (cry face) facial expressions. Ninety‐five college students rated a series of naturally occurring and digitally edited images of infant facial expressions. Naturally occurring smiles and cry faces involving the co‐occurrence of greater lip movement, mouth opening, and eye constriction, were rated as expressing stronger positive and negative emotion, respectively, than expressions without these 3 features. Ratings of digitally edited expressions indicated that eye constriction contributed to higher ratings of positive emotion in smiles (i.e., in Duchenne smiles) and greater eye constriction contributed to higher ratings of negative emotion in cry faces. Stronger mouth opening contributed to higher ratings of arousal in both smiles and cry faces. These findings indicate a set of similar facial movements are linked to perceptions of greater emotional intensity, whether the movements occur in positive or negative infant emotional expressions. This proposal is discussed with reference to discrete, componential, and dynamic systems theories of emotion.     

Gender-based expectancies and observer judgments of smiling

Beliefs about gender differences in smiling were measured by asking college students to rate how much they believed hypothetical women and men smile. Women were believed to smile more than men. Individual differences in this belief did not affect subsequent scoring of smiles, whether scored by counting the number of smiles exhibited by videotaped male and female targets or by rating the amount of smiling exhibited. An expectation about gender differences in smiling was experimentally induced, either that women smile more than men or that there is no gender difference in smiling. This expectation did not affect subsequent scoring of smiles, regardless of scoring method and regardless of whether the expectation was induced as a casual aside or in more formal instructions. In all conditions female targets were observed to smile more than male targets. Rating produced larger target gender effects than counting, but this could have been due to the nature of the rating process rather than observer bias.The authors gratefully acknowledge the assistance of Thomas Leahy and Joe Pieri in data collection, and of Cliff Brown and an anonymous reviewer for their comments on an earlier version of this paper. Miles Patterson served as Action Editor for this article.     

Quantifying Facial Expression Synchrony in Face-To-Face Dyadic Interactions: Temporal Dynamics of Simultaneously Recorded Facial EMG Signals

Human social interaction is enriched with synchronous movement which is said to be essential to establish interactional flow. One commonly investigated phenomenon in this regard is facial mimicry, the tendency of humans to mirror facial expressions. Because studies investigating facial mimicry in face-to-face interactions are lacking, the temporal dynamics of facial mimicry remain unclear. We therefore developed and tested the suitability of a novel approach to quantifying facial expression synchrony in face-to-face interactions: windowed cross-lagged correlation analysis (WCLC) for electromyography signals. We recorded muscle activations related to smiling (Zygomaticus Major) and frowning (Corrugator Supercilii) of two interaction partners simultaneously in 30 dyadic affiliative interactions. We expected WCLC to reliably detect facial expression synchrony above chance level and, based on previous research, expected the occurrence of rapid synchronization of smiles within 200 ms. WCLC significantly detected synchrony of smiling but not frowning compared to a control condition of chance level synchrony in six different interactional phases (smiling: d _z s = .85–1.11; frowning: d _z s = .01–.30). Synchronizations of smiles between interaction partners predominantly occurred within 1000 ms, with a significant amount occurring within 200 ms. This rapid synchronization of smiles supports the notion of the existence of an anticipated mimicry response for smiles. We conclude that WCLC is suited to quantify the temporal dynamics of facial expression synchrony in dyadic interactions and discuss implications for different psychological research areas.     

Effects of Social Anxiety on Emotional Mimicry and Contagion: Feeling Negative,but Smiling Politely

Socially anxiety may be related to a different pattern of facial mimicry and contagion of others’ emotions. We report two studies in which participants with different levels of social anxiety reacted to others’ emotional displays, either shown on a computer screen (Study 1) or in an actual social interaction (Study 2). Study 1 examined facial mimicry and emotional contagion in response to displays of happiness, anger, fear, and contempt. Participants mimicked negative and positive emotions to some extent, but we found no relation between mimicry and the social anxiety level of the participants. Furthermore, socially anxious individuals were more prone to experience negative emotions and felt more irritated in response to negative emotion displays. In Study 2, we found that social anxiety was related to enhanced mimicry of smiling, but this was only the case for polite smiles and not for enjoyment smiles. These results suggest that socially anxious individuals tend to catch negative emotions from others, but suppress their expression by mimicking positive displays. This may be explained by the tendency of socially anxious individuals to avoid conflict or rejection.     

The quantification of smiling using a microcomputer-based approach

This study examines the relationship between the ratings made of a set of smiling and neutral expressions and the facial features which influence these ratings. Judges were shown forty real face photographs of smile and neutral expressions and forty line drawings derived from these photographs and were asked to rate the degree of smiling behavior of each expression. The line drawings of the face were generated by a microcomputer which utilizes a mathematical model to quantify facial expression. Twelve facial measures were generated by the computer. Significant differences were found between the ratings of smile and neutral expressions. The Mode of Presentation did not contribute significantly to the ratings. Using the facial measures as separate covariates, five mouth measures and one eye measure were found to discriminate significantly between the ratings made on smile and neutral expressions. When entered as simultaneous covariates, only four mouth measures contributed to the differences found in the expression ratings. Future research projects which may utilise the computer model are discussedThe research reported in this paper was conducted in the Department of Psychology, University of Adelaide. The authors would like to thank Ulana Sudomlak for her assistance in the gathering and recording of the data for this project, and the reviewers for their helpful comments on an earlier version of this paper.     

Fooled by a Smile: Detecting Anxiety in Others

Results from this research on facial affect indicative of state anxiety suggest that expressors' smiles may have masked self-reported state anxiety such that judges were misled in their judgments of expressors' state anxiety. While in 17 earlier studies judges were highly accurate in detecting state anxiety, judges were unable to distinguish low from high state anxiety in the present samples, and sometimes rated expressors in high state-anxiety segments as more happy and likable than in low state-anxiety segments. The critical difference between the present and earlier studies seems to be the size of the image and the resulting fact that nonenjoyment smiles were more visible to judges.     

Movement Differences between Deliberate and Spontaneous Facial Expressions: Zygomaticus Major Action in Smiling

Previous research suggests differences in lip movement between deliberate and spontaneous facial expressions. We investigated within participant differences between deliberately posed and spontaneously occurring smiles during a directed facial action task. Using automated facial image analysis, we quantified lip corner movement during periods of visible Zygomaticus major activity. Onset and offset speed, amplitude of movement, and offset duration were greater in deliberate smiles. In contrast to previous results, however, lip corner movement asymmetry was not greater in deliberate smiles. Observed characteristics of deliberate and spontaneous smiling may be related to differences in the typical context and purpose of the facial signal. Karen L. Schmidt, Zara Ambadar, Jeffrey F. Cohn, and L. Ian Reed are affiliated with the University of Pittsburgh, Pittsburgh, PA 15260, USA. Jeffrey F. Cohn is also affiliated with the Carnegie Mellon University, Pittsburgh, PA 15260, USA. This research was supported by NIMH Grants MH15279 and 167376 to Karen L. Schmidt, and NIMH Grant MH 51435 to Jeffrey F. Cohn. We gratefully acknowledge the assistance of Adena Zlochower in digitizing videotape used in this analysis and Rachel Levenstein in the analysis of data described in this paper. Address correspondence to Karen L. Schmidt, University of Pittsburgh, 121 University Pl, Pittsburgh, PA 15260, USA; E-mail: kschmidt@pitt.edu     

Audience effects in affective imagery: Replication and extension to dysphoric imagery

Subjects imagined situations during which they reported feeling happiness, sadness, anger, or fear, at both low and high levels of imagined sociality. Electromyographic (EMG) activity was recorded from four facial sites overlying the left forehead, brow, cheek, and lip. Controlling for reported emotion, facial EMG activity was influenced by the sociality of the imagery. Results corroborate previous findings of imaginary audience effects on smiling, and extend these effects to imagined situations that elicit dysphoria.This research was supported in part by a University of California Academic Senate grant to the first author. We thank Norman Severe for his assistance in running subjects.     

The Development of Anticipatory Smiling

When do infants begin to communicate positive affect about physical objects to their social partners? We examined developmental changes in the timing of smiles during episodes of initiating joint attention that involved an infant gazing between an object and a social partner. Twenty‐six typically developing infants were observed at 8, 10, and 12 months during the Early Social‐Communication Scales, a semistructured assessment for eliciting initiating joint attention and related behaviors. The proportion of infant smiling during initiating joint attention episodes did not change with age, but there was a change in the timing of the smiles. The likelihood of infants smiling at an object and then gazing at the experimenter while smiling (anticipatory smiling) increased between 8 and 10 months and remained stable between 10 and 12 months. The increase in the number of infants who smiled at an object and then made eye contact suggests a developing ability to communicate positive affect about an object.     

Contributions of a babyface and a childlink voice to impressions of Moving and Talking Faces

The present research examined if the impact of a babyface on trait impressions documented in previous research holds true for moving faces. It also assessed the relative impact of a babyface and a childlike voice on impressions of talking faces. To achieve these goals, male and female targets' traits as well as their facial and vocal characteristics were rated in one of four information conditions: Static Face, Moving Face, Voice Only, or Talking Face. Facial structure measurements were also made by two independent judges. Data for male faces supported the experimental hypotheses. Specifically, regression analyses revealed that although a babyish facial structure created the impression of weakness even when a target moved his face, this effect was diminished when he also talked. Here a childlike voice and dynamic babyishness, as assessed by moving face ratings, were more important predictors. Similarly, a babyish facial structure had less impact on impressions of a talking target's warmth than did dynamic babyishness or other facial movement. A childlike voice had no impact on impressions of warmth when facial information was available.This research was supported by a NIMH Grant #BSR 5 R01 MH42684 to the first author. The authors would like to thank Linda Linn for her assistance in preparing the stimulus materials and Danylle Rudin for her help in collecting the data. Thanks are also extended to David M. Buss for his suggestions about alternative explanations which may help guide future work.     

A New Perspective on Neonatal Smiling: Differences Between the Judgments of Expert Coders and Naive Observers

To better understand the form and recognizability of neonatal smiling, 32 newborns (14 girls; M = 25.6 hr) were videorecorded in the behavioral states of alertness, drowsiness, active sleep, and quiet sleep. Baby Facial Action Coding System coding of both lip corner raising (simple or non‐Duchenne) and lip corner raising with cheek raising (Duchenne smile) was followed by a smile recognition task using 48 naive observers. Both types of smiles were detected in all behavioral states. Lip corner raising with cheek raising (Duchenne smiling) tended to predominate in active (rapid eye movement) sleep, suggesting a potential tie to early constituents of emotion. A significant portion of the typically briefer lip corner raising distinguished by expert coders was not recognized as smiling by the naive observers. These briefer actions may represent a motor phenomenon idiosyncratic to the neonatal period.     

Neutral faces in context: Their emotional meaning and their function

We report two studies which attempt to explain why some researchers found that neutral faces determine judgments of recognition as strongly as expressions of basic emotion, even through discrepant contextual information. In the first study we discarded the possibility that neutral faces could have an intense but undetected emotional content: 60 students' dimensional ratings showed that 10 neutral faces were perceived as less emotional than 10 emotional expressions. In Study 2 we tested whether neutral faces can convey strong emotional messages in some contexts: 128 students' dimensional ratings on 36 discrepant combinations of neutral faces or expressions with contextual information were more predictable from expressions when the contextual information consisted of common, everyday situations, but were more predictable from neutral faces when the context was an uncommon, extreme situation. In line with our hypothesis, we discuss these paradoxical findings as being caused by the salience of neutral faces in some particular contexts.This research was conducted as a part of the first author's doctoral dissertation, and was supported by a grant (PS89-022) of the Spanish DGICyT. We thank David Weston for his help in preparing the text. We also thank two anonymous reviewers for their valuable comments on a previous draft of this article.     

The Mystery of the European Smile: A Comparison Based on Individual Photographs Provided by Internet Users

The aim of the study was to analyze cross-cultural differences in preference for smiling among the users of one of the most popular instant messaging sites called Windows Live Messenger in terms of facial expression (smiling vs. non-smiling) on the photographs accompanying their profiles. 2,000 photos from 10 countries were rated by two independent judges. Despite the fact that 20 years have passed since the fall of the Berlin Wall, Internet users from a former Soviet bloc appear to smile less often than those from Western Europe. Also, replicating past research, women irrespective of their nationality smiled more than men.