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{{Short description|Expression of the face}} {{more citations needed|date=July 2018}} '''Facial expression''' is the motion and positioning of the [[Skeletal muscle|muscles]] beneath the [[skin]] of the face. These movements convey the [[emotion]]al state of an individual to observers and are a form of [[nonverbal communication]]. They are a primary means of conveying social information between [[human]]s, but they also occur in most other [[mammals]] and some other animal [[species]]. Humans can adopt a facial expression voluntarily or involuntarily, and the neural mechanisms responsible for controlling the expression differ in each case. Voluntary facial expressions are often socially conditioned and follow a cortical route in the brain. Conversely, involuntary facial expressions are believed to be innate and follow a subcortical route in the brain. Facial recognition can be an emotional experience for the brain and the [[amygdala]] is highly involved in the recognition process. Beyond the accessory nature of facial expressions in spoken communication between people, they play a significant role in communication with [[sign language]]. Many phrases in sign language include facial expressions. There is controversy surrounding the question of whether facial expressions are a worldwide and universal display among humans. == Creation == === Facial muscles === [[File:Lars Jacob as Comedy & Tragedy 1972.JPG|thumb|An actor acting out ''Drama Masks'' ([[Thalia (Muse)|Thalia]] and [[Melpomene]]) in 1972]] Facial expressions are vital to social communication between humans. They are caused by the movement of muscles that connect to the skin and [[fascia]] in the face. These muscles move the skin, creating lines and folds and causing the movement of facial features, such as the mouth and eyebrows. These muscles develop from the second [[pharyngeal arch]] in the embryo. The [[temporalis]], [[masseter]], and [[internal pterygoid muscle|internal]] and [[external pterygoid muscle]]s, which are mainly used for chewing, have a minor effect on expression as well. These muscles develop from the first pharyngeal arch.<ref name="Rinn">{{cite journal|last=Rinn|first=William E.|year=1984|title=The Neuropsychology of Facial Expression: A Review of the Neurological and Psychological Mechanisms for Producing Facial Expressions|journal=Psychological Bulletin|volume=95|issue=1|pages=52–77|doi=10.1037/0033-2909.95.1.52|pmid=6242437}}</ref> === Neuronal pathways === There are two brain pathways associated with facial expression; the first is voluntary expression. Voluntary expression travels from the [[primary motor cortex]] through the [[pyramidal tract]], specifically the [[corticobulbar tract|corticobulbar projections]]. The cortex is associated with display rules in emotion, which are social [[precepts]] that influence and modify expressions. Cortically related expressions are made consciously.<ref name="Rinn" /> The second type of expression is emotional. These expressions originate from the [[extrapyramidal motor system]], which involves subcortical nuclei. For this reason, genuine emotions are not associated with the cortex and are often displayed unconsciously. This is demonstrated in infants before the age of two; they display distress, disgust, interest, anger, contempt, surprise, and fear. Infants' displays of these emotions indicate that they are not cortically related. Similarly, blind children also display emotions, proving that they are subconscious rather than learned. Other subcortical facial expressions include the "knit brow" during concentration, raised eyebrows when listening attentively, and short "punctuation" expressions to add emphasis during speech. People can be unaware that they are producing these expressions.<ref name="Rinn" /> === Asymmetries === The lower portions of the face are controlled by the opposite [[cerebral hemisphere]], causing asymmetric facial expression. Because the [[right hemisphere]] is more specialised for [[emotional expression]], emotions are more strongly expressed on the left side of the face,<ref>{{cite journal|author=Blonder LX, Bowers D, Heilman KM|year=1991|title=The role of right hemisphere in emotional communication|journal=Brain|volume=114|issue=3|pages=1115–1127|doi=10.1093/brain/114.3.1115|pmid=2065243}}</ref> particularly for [[negative affectivity|negative emotions]].<ref>{{cite journal|author=Ahern GL, Schwartz GE|year=1979|title=Differential lateralization for positive versus negative emotion|journal=Neuropsychologia|volume=17|issue=6|pages=693–698|doi=10.1016/0028-3932(79)90045-9|pmid=522984|s2cid=27771100}}</ref> [[Asymmetries]] in expression can be seen in chimeric faces (facial portraits made by combining the left and right halves of faces with different expressions)<ref>{{cite journal|author=Levy J, Heller W, Banich MT, Burton LA|year=1983|title=Asymmetry of Perception in Free Viewing of Chimeric Faces|journal=Brain and Cognition|volume=2|issue=4|pages=404–419|doi=10.1016/0278-2626(83)90021-0|pmid=6546034|s2cid=21456608}}</ref> and also in [[portraits]] which more often show the left, more emotional side of the face than the right.<ref>{{cite journal|author=Nicholls Mike, Clode D, Wood SJ and Wood AG|year=1999|title=Laterality of expression in portraiture: Putting your best cheek forward|journal=Proceedings of the Royal Society B|volume=266|issue=1428|pages=1517–1522|doi=10.1098/rspb.1999.0809|pmid=10467743|pmc=1690171}}</ref> == Neural mechanisms in face perception == {{See also|Face perception}} The amygdala plays an important role in facial recognition. Functional imaging studies have found that when shown pictures of faces, there is a large increase in the activity of the amygdala. The amygdala receives visual information from the thalamus via the subcortical pathways.<ref>{{cite book|last=Carlson|first=Neil R.|title=Physiology of behavior|year=2010|publisher=Allyn & Bacon|location=Boston|isbn=978-0-205-66627-0|pages=386–89|edition=10th}}</ref> The amygdala may also have a significant role in the recognition of fear and negative emotions. It is believed that the emotion disgust is recognized through activation of the insula and basal ganglia. The recognition of emotion may also utilize the occipitotemporal neocortex, orbitofrontal cortex and right frontoparietal cortices.<ref>{{cite journal|last=Adolphs|first=Ralph|title=Neural systems for recognizing emotion|journal=Current Opinion in Neurobiology|date=9 May 2002|volume=12|issue=2|pages=169–77|doi=10.1016/S0959-4388(02)00301-X|pmid=12015233|s2cid=13169882}}</ref> === Gender and facial cues === More than anything though, what shapes a child's cognitive ability to detect facial expression is being exposed to it from the time of birth. The more an infant is exposed to different faces and expressions, the more able they are to recognize these emotions and then mimic them for themselves. Infants are exposed to an array of emotional expressions from birth, and evidence indicates that they imitate some facial expressions and gestures (e.g., tongue protrusion) as early as the first few days of life.<ref>Field, T. M., Woodson, R., Cohen, D., Greenberg, R., Garcia, R., & Collins, K. (1983). Discrimination and imitation of facial expressions by term and preterm neonates. ''Infant Behavior and Development'', ''6''(4), 485-489.</ref>{{full citation needed|date=November 2013}} In addition, gender affects the tendency to express, perceive, remember, and forget specific emotions.<ref>{{Cite journal|last=Tay|first=Peter Kay Chai|date=2015-06-22|title=The adaptive value associated with expressing and perceiving angry-male and happy-female faces|journal=Frontiers in Psychology|volume=6|page=851|doi=10.3389/fpsyg.2015.00851|issn=1664-1078|pmc=4476135|pmid=26157405|doi-access=free}}</ref><ref name=":0">{{Cite journal|last1=Tay|first1=Peter K.C.|last2=Yang|first2=Hwajin|date=2017-05-22|title=Angry faces are more resistant to forgetting than are happy faces: directed forgetting effects on the identity of emotional faces|journal=Journal of Cognitive Psychology|volume=29|issue=7|pages=855–65|doi=10.1080/20445911.2017.1323907|s2cid=148887899|issn=2044-5911|url=https://ink.library.smu.edu.sg/soss_research/2313}}</ref> For instance, angry male faces and happy female faces are more recognizable, compared to happy male faces and angry female faces.<ref name=":0" /> == Communication == A 2020 study on "emotion residue" found that even when study participants attempted to make neutral facial expressions, their faces still retained emotion residue from prior expressions, and these prior expressions were able to be detected by observers.<ref>{{Cite journal |last1=Albohn |first1=Daniel N. |last2=Adams |first2=Reginald B. |date=2021-05-01 |title=Emotion Residue in Neutral Faces: Implications for Impression Formation |url=https://doi.org/10.1177/1948550620923229 |journal=Social Psychological and Personality Science |language=en |volume=12 |issue=4 |pages=479–486 |doi=10.1177/1948550620923229 |issn=1948-5506 |s2cid=225674024|url-access=subscription }}</ref> A 1988 study on the “facial feedback” hypothesis found that study participants mood was improved when they smiled. <ref>{{Cite journal |last1=Strack |first1=F. |last2=Martin |first2=L. L. |last3=Stepper |first3=S. |date=May 1988 |title=Inhibiting and facilitating conditions of the human smile: a nonobtrusive test of the facial feedback hypothesis |url=https://pubmed.ncbi.nlm.nih.gov/3379579/ |journal=Journal of Personality and Social Psychology |volume=54 |issue=5 |pages=768–777 |doi=10.1037/0022-3514.54.5.768 |issn=0022-3514 |pmid=3379579}}</ref> However, this study later failed a large replication attempt.<ref>{{Cite web |last=MacDonald |first=Fiona |date=2016-09-26 |title=Two More Classic Psychology Studies Just Failed The Reproducibility Test |url=https://www.sciencealert.com/two-more-classic-psychology-studies-just-failed-the-reproducibility-test |access-date=2024-06-26 |website=ScienceAlert |language=en-US}}</ref> One experiment investigated the influence of gaze direction and facial expression on face memory. Participants were shown a set of unfamiliar faces with either happy or angry facial expressions, which were either gazing straight ahead or had their gaze averted to one side. Memory for faces that were initially shown with angry expressions was found to be poorer when these faces had averted as opposed to direct gaze, whereas memory for individuals shown with happy faces was unaffected by gaze direction. It is suggested that memory for another individual's face partly depends on an evaluation of the behavioural intention of that individual.<ref>{{Cite journal |last1=Nakashima |first1=Satoshi F. |last2=Langton |first2=Stephen R.H. |last3=Yoshikawa |first3=Sakiko |date=2012 |title=The effect of facial expression and gaze direction on memory for unfamiliar faces |url=http://dspace.stir.ac.uk/bitstream/1893/21041/1/Nakashima_2012.pdf |journal=Cognition and Emotion |volume=26 |issue=7 |pages=1316–25 |doi=10.1080/02699931.2011.619734 |pmid=22077759 |s2cid=15646129 |hdl-access=free |hdl=1893/21041}}</ref> A 2025 study from [[Nottingham Trent University]] in England found that people who were facially expressive were more liked by social partners, which may be one reason why people produce, on average, 101 facial movements per minute during a given social interaction.<ref>{{cite web | last=Kavanagh | first=Eithne | last2=Whitehouse | first2=Jamie | last3=Waller | first3=Bridget | title=Expressive Faces Make People More Likable | website=Scientific American | date=2025-01-28 | url=https://www.scientificamerican.com/article/expressive-faces-make-people-more-likable/ | access-date=2025-01-30}}</ref> === Eye contact === {{See also|Eye contact}} A person's face, especially their eyes, creates the most obvious and immediate cues that lead to the formation of impressions. This article discusses eyes and facial expressions and the effect they have on [[interpersonal communication]]. A person's eyes reveal much about how they are feeling, or what they are thinking. Blink rate can reveal how nervous or at ease a person may be. Research by [[Boston College]] professor Joe Tecce suggests that stress levels are revealed by blink rates. He supports his data with statistics on the relation between the blink rates of presidential candidates and their success in their races. Tecce claims that the faster blinker in the presidential debates has lost every election since 1980.<ref>"In the blink of an eye." (October 21, 1999). Newsweek.</ref> Though Tecce's data is interesting, it is important to recognize that [[non-verbal communication]] is multi-channeled, and focusing on only one aspect is reckless. Nervousness can also be measured by examining each candidates' perspiration, [[eye contact]] and stiffness.<ref name="Rothwell, J. Dan 2004">Rothwell, J. Dan. In the Company of Others: An Introduction to Communication. United States: McGraw-Hill, 2004.</ref> Within their first year, Infants learn rapidly that the looking behaviors of others convey significant information. Infants prefer to look at faces that engage them in mutual gaze and that, from an early age, healthy babies show enhanced neural processing of direct gaze.<ref name="Eye Contact Detection in Humans From Birth">[http://www.pnas.org/content/99/14/9602.full Eye Contact Detection in Humans From Birth], PNAS Vol 99 N.14 2002.</ref> Eye contact is another major aspect of facial communication. Some have hypothesized that this is due to infancy, as humans are one of the few mammals who maintain regular eye contact with their mother while nursing.<ref>Spitz, Rene A., and Wolf, K.M. "The Smiling Response: A Contribution to the Ontogenesis of Social Relations." Genetic Psychology Monographs. 34 (August 1946). pp. 57–125.</ref> Eye contact serves a variety of purposes. It regulates conversations, shows interest or involvement, and establishes a connection with others. But different cultures have [[Eye contact#Cultural differences|different rules for eye contact]]. Certain Asian cultures can perceive direct eye contact as a way to signal competitiveness, which in many situations may prove to be inappropriate. Others lower their eyes to signal respect, and similarly, eye contact is avoided in Nigeria;<ref>[https://archive.org/details/caringforpatient0000gala_c1q5 Caring for Patients from Different Cultures], by Geri-Ann Galanti, [https://archive.org/details/caringforpatient0000gala_c1q5/page/34 <!-- quote=eye contact. --> p. 34]</ref> however, in [[western culture]]s this could be misinterpreted as lacking [[Self-esteem|self-confidence]]. Even beyond the idea of eye contact, eyes communicate more data than a person even consciously expresses. [[Pupil dilation]] is a significant cue to a level of excitement, pleasure, or attraction. Dilated pupils indicate greater affection or attraction, while constricted pupils send a colder signal. === Sign languages === Facial expression is used in [[sign language]]s to convey specific meanings. In [[American Sign Language]] (ASL), for instance, raised eyebrows combined with a slightly forward head tilt to indicate that what is being signed is a [[yes–no question]]. Lowered eyebrows are used for wh-word questions. Facial expression is also used in sign languages to show adverbs and adjectives such as distance or size: an open mouth, squinted eyes and tilted back head indicate something far while the mouth pulled to one side and the cheek held toward the shoulder indicate something close, and puffed cheeks mean very large. It can also show the manner in which something is done, such as carelessly or routinely.<ref>Baker, Charlotte, and Dennis Cokely (1980). ''American Sign Language: A teacher's resource text on grammar and culture.'' Silver Spring, MD: T.J. Publishers.</ref> Some of these expressions, also called non-manual signs, are used similarly in different sign languages while others are different from one language to another. For example, the expression used for 'carelessly' in ASL means 'boring or unpleasant' in [[British Sign Language]].<ref>Sutton-Spence, Rachel, and [[Bencie Woll]] (1998). ''The linguistics of British Sign Language.'' Cambridge: Cambridge University Press.</ref> == Universality hypothesis == The universality hypothesis is the assumption that certain facial expressions and face-related acts or events are signals of specific emotions (happiness with laughter and smiling, sadness with tears, anger with a clenched jaw, fear with a grimace, or [[gurn]], surprise with raised eyebrows and wide eyes along with a slight retraction of the ears, and disgust with a wrinkled nose and squinted eyes—emotions which frequently lack the social component of those like shame, pride, jealousy, envy, deference, etc.) and are recognized by people regardless of culture, language, or time. The belief in the evolutionary basis of these kinds of facial expressions can be traced back to [[Charles Darwin|Darwin]]'s ''[[The Expression of the Emotions in Man and Animals]].'' Reviews of the universality hypothesis have been both supportive<ref name="Ekman, Friesen, Ellsworth">{{cite journal|last=Ekman|first=P.|author2=W.V. Friesen |author3=P. Ellsworth |year=1972|title=Emotion in the human face: Guidelines for research and a review of findings.|publisher=Permagon|location=New York}}</ref><ref name="Izard">{{citation |last=Izard|first=C.E.|year=1971|title=The face of emotion|publisher=Appleton-Century-Crofts|location=New York}}</ref> and critical.<ref name="Woodworth">{{cite book|last1=Woodworth|first1=R.S.|last2=Schlosberg|first2=H.|title=Experimental Psychology|year=1954|publisher=Henry Holt|location=New York}}</ref><ref name="Russell">{{cite journal|last=Russell|first=James A.|year=1994|journal=Psychological Bulletin|volume=115|issue=1|pages=102–41|doi=10.1037/0033-2909.115.1.102|pmid=8202574|title=Is there universal recognition of emotion from facial expression? A review of the cross-cultural studies|s2cid=4823006 }}</ref> Work in 2013 by Nelson and Russell<ref name="Nelson and Russell">{{cite journal|last1=Nelson|first1=N.L.|last2=Russell|first2=J.A.|year=2013|title=Universality revisited|journal=Emotion Review|volume=5|issue=1|pages=8–15|doi=10.1177/1754073912457227|s2cid=220262886}}</ref> and Jack et al.<ref name="Jack et al.">{{cite journal|last1=Jack|first1=R.E.|last2=Garrod|first2=O.G.|last3=Yu|first3=H.|last4=Caldara|first4=R. |last5=Schyns|first5=P.G.|year=2012|title=Facial expressions of emotion are not culturally universal|journal=Proceedings of the National Academy of Sciences|volume=109|issue=19|pages=7241–44|doi=10.1073/pnas.1200155109|pmid=22509011|pmc=3358835|doi-access=free}}</ref> has been especially critical. === Support === [[Paul Ekman|Ekman]]'s work on facial expressions had its starting point in the work of psychologist [[Silvan Tomkins]]. Ekman showed that facial expressions of emotion are not culturally determined, but universal across human cultures. To demonstrate his universality hypothesis, Ekman ran a test on a group of the South [[Fore people]] of [[New Guinea]], a pre-industrial culture that was isolated from the West. The experiment participants were told brief stories about emotional events (happiness, sadness, anger, fear, surprise, and disgust). After each story, they were asked to select the matching facial expression from an array of three faces.<ref name="Ekman and Friesen">{{cite journal|last=Ekman|first=P.|author2=W.V. Friesen|year=1971|url=http://www.ekmaninternational.com/ResearchFiles/Constants-Across-Cultures-In-The-Face-And-Emotion.pdf|title=Constants across cultures in the face and emotion|journal=Journal of Personality and Social Psychology|issue=2|pages=124–29|doi=10.1037/h0030377|pmid=5542557|volume=17|s2cid=14013552 |access-date=2015-02-28|archive-url=https://web.archive.org/web/20150228022800/http://www.ekmaninternational.com/ResearchFiles/Constants-Across-Cultures-In-The-Face-And-Emotion.pdf|archive-date=2015-02-28|url-status=dead}}</ref> The Fore selected the ''correct face'' on 64–90% of trials but had difficulty distinguishing the fear face from the surprise face. Children selected from an array of only two faces, and their results were similar to the adults'. Subsequent cross-cultural studies found similar results<ref name="Ekman et al">{{cite journal|last=Ekman|first=P.|author2=Friesen, W.V. |author3=O'Sullivan, M. |year=1987|title=Universals and cultural differences in the judgments of facial expressions of emotion|journal=Journal of Personality & Social Psychology |volume=53|issue=4|pages=712–17|doi=10.1037/0022-3514.53.4.712|pmid=3681648|display-authors=etal}}</ref> === Criticism === Both sides of this debate agree that the face expresses emotion. The controversy surrounds the uncertainty about what specific emotional information is read from a facial expression. Opponents of the universality hypothesis believe that more general information is pieced together with other contextual information in order to determine how a person feels.<ref name="Carroll and Russell">{{cite journal|last=Carroll|first=J.M.|author2=J.A. Russell|s2cid=4835524|year=1996|title=Do facial expressions signal specific emotions? Judging emotion from the face in context|journal=Journal of Personality and Social Psychology|volume=70|issue=2|pages=205–18|doi=10.1037/0022-3514.70.2.205|pmid=8636880}}</ref> One argument against the evidence presented in support of the universality hypothesis is that the method typically used to demonstrate universality inflates recognition scores.<ref name="Russell" /> Although each factor may contribute only a small amount to the inflation, combined, they can produce exaggerated scores. The three main factors are the following: * The universality hypothesis focuses on people's abilities to recognize spontaneous facial expressions as they occur naturally. However, the facial expressions used to test this hypothesis are posed. Studies of spontaneous facial expressions are rare and find that participants' recognition of the expressions is lower than that of the corresponding posed expressions.<ref name="Matsumoto">{{cite journal|last=Matsumoto|first=David|author2=LeRoux, Jeff |author3=Wilson-Cohn, Carida |date=September 2000|title=A New Test to Measure Emotion Recognition Ability: Matsumoto and Ekman's Japanese and Caucasian Brief Affect Recognition Test (JACBART)|journal=Journal of Nonverbal Behavior|volume=24|issue=3|pages=179–209|display-authors=etal|url=http://davidmatsumoto.com/content/2000%20A%20New%20Test%20to%20Measure%20Emotion%20Recognition.pdf|doi=10.1023/A:1006668120583|s2cid=18039888}}</ref><ref name="Naab and Russell">{{cite journal|last=Naab|first=P.J.|author2=J.A. Russell|year=2007|title=Judgments of emotion from spontaneous facial expressions of New Guineans|journal=Emotion|volume=7|issue=4|pages=736–44|doi=10.1037/1528-3542.7.4.736|pmid=18039042}}</ref> * In most studies, participants are shown more than one facial expression (Ekman recommends six of each expression). However, people judge facial expressions relative to others that they have seen,<ref name="Thayer">{{cite journal|last=Thayer|first=Stephen|year=1980|title=The effect of expression sequence and expressor identity on judgments of the intensity of facial expression|journal=Journal of Nonverbal Behavior|volume=5|issue=2|pages=71–79|doi=10.1007/bf00986510|s2cid=144353978}}</ref> and participants who judge more than one facial expression have higher recognition rates than those who judge only one.<ref name="Russell" /> * The response format that is most commonly used in [[emotion recognition]] studies is [[Ipsative|forced choice]]. In forced choice, for each facial expression, participants are asked to select their response from a short list of emotion labels. The forced choice method determines the emotion attributed to the facial expressions via the labels that are presented.<ref name="Russell" /> That is, participants will select the best match to the facial expression even if it is not the emotion label they would have provided spontaneously and even if they would not have labeled the expression as an emotion at all.<ref name="Wagner">{{cite journal|last=Wagner|first=H. L.|year=2000|title=The accessibility of the term "contempt" and the meaning of the unilateral lip curl|journal=Cognition and Emotion|volume=14|pages=689–710|doi=10.1080/02699930050117675|issue=5|s2cid=144565541}}</ref> === Evolutionary significance of universality === Darwin argued that the expression of emotions has evolved in humans from animal ancestors, who would have used similar methods of expression. Darwin believed that expressions were unlearned and innate in human nature and were therefore evolutionarily significant for survival. He compiled supporting evidence from his research on different cultures, on infants, and in other animal species.<ref name="Ekman 2006">{{cite book|editor-last=Ekman|editor-first=Paul|title=Darwin and facial expression: a century of research in review|year=2006|publisher=Malor Books|location=Cambridge, MA|isbn=978-1-883536-88-6}}</ref>{{rp|12}} Ekman found that people from different cultures recognized certain facial expressions despite vast cultural differences, and his findings tended to confirm Darwin's initial hypothesis.<ref>{{cite book|last=Carlson|first=Neil R.|title=Physiology of behavior|year=2012|publisher=Pearson Education Inc.|location=New Jersey|isbn=978-0-205-23939-9|page=377|edition=11th}}</ref> [[Emotions and culture|Cross-cultural studies]] had shown that there are similarities in the way emotions are expressed across diverse cultures, but studies have even shown that there are similarities between species in how emotions are expressed. Research has shown that chimpanzees are able to communicate many of the same facial expressions as humans through the complex movements of the facial muscles. In fact, the facial cues were so similar that Ekman's [[Facial Action Coding System]] could be applied to the chimps in evaluating their expressions.<ref>{{cite journal|last=Vick|first=Sarah-Jane|author2=Waller, Bridget M., Parr, Lisa A., Smith Pasqualini, Marcia C., Bard, Kim A.|title=A Cross-species Comparison of Facial Morphology and Movement in Humans and Chimpanzees Using the Facial Action Coding System (FACS) |journal=Journal of Nonverbal Behavior|date=15 December 2006|volume=31|issue=1|pages=1–20|doi=10.1007/s10919-006-0017-z|pmid=21188285|pmc=3008553}}</ref> Of course, differences between the species' physical facial properties, such as white sclera and everted lips in chimps, would mean that some expressions could not be compared.<ref>{{cite journal|last=Vick|first=Sarah-Jane|author2=Waller, Bridget M., Parr, Lisa A., Smith Pasqualini, Marcia C., Bard, Kim A.|title=A Cross-species Comparison of Facial Morphology and Movement in Humans and Chimpanzees Using the Facial Action Coding System (FACS)|journal=Journal of Nonverbal Behavior|date=15 December 2006|volume=31|issue=1|page=16|doi=10.1007/s10919-006-0017-z|pmid=21188285|pmc=3008553}}</ref> Similarly, Darwin observed that infants' method of expression for certain emotions was instinctive, as they were able to display emotional expressions they had not themselves yet witnessed.<ref>{{cite journal|last=Russell|first=James|title=Is There Universal Recognition of Emotion From Facial Expression? A Review of the Cross-Cultural Studies|journal=Psychological Bulletin|year=1994|volume=115|pages=102–41|pmid=8202574|doi=10.1037/0033-2909.115.1.102|issue=1|s2cid=4823006 }}</ref> Facial morphology impacts expression recognition in important ways, and therefore, infant facial morphology may also serve some specific communicative function. These similarities in morphology and movement are important for the correct interpretation of an emotion.<ref>{{cite journal|last=Vick|first=Sarah-Jane|author2=Waller, Bridget M., Parr, Lisa A., Smith Pasqualini, Marcia C., Bard, Kim A.|title=A Cross-species Comparison of Facial Morphology and Movement in Humans and Chimpanzees Using the Facial Action Coding System (FACS)|journal=Journal of Nonverbal Behavior|date=15 December 2006|volume=31|issue=1|page=17|doi=10.1007/s10919-006-0017-z|pmid=21188285|pmc=3008553}}</ref> Darwin was particularly interested in the functions of facial expression as evolutionarily important for survival. He looked at the functions of facial expression in terms of the utility of expression in the life of the animal and in terms of specific expressions within species. Darwin deduced that some animals communicated feelings of different emotional states with specific facial expressions. He further concluded that this communication was important for the survival of animals in group-dwelling species; the skill to effectively communicate or interpret another animal's feelings and behaviors would be a principal trait in naturally fit species.<ref name="Ekman 2006" />{{rp|12–14}} However, this suggests that solitary species such as [[orangutan]]s would not exhibit such expressions. For a discussion of the controversies on these claims, see Fridlund<ref name="Fridlund">{{Cite book |author=Alan J. Fridlund |url=https://archive.org/details/humanfacialexpre0000frid |title=Human facial expression |publisher=San Diego: Academic Press |year=1994 |isbn=978-0-12-267630-7 |edition=1 |url-access=registration}}</ref> and Russell & Fernandez Dols.<ref name="Russell & Fernandez Dols">{{Cite book |author1=J.A. Russell |title=The psychology of facial expression |author2=J.M. Fernandez Dols |publisher=Cambridge University Press |year=1997 |isbn=978-0-521-58796-9 |edition=1}}</ref> == See also == [[File:Pouting boy in Shamar, Iraq.jpg|thumb|A boy displays an angry pout.]] * [[Affect display]] * [[Bell's palsy]] * [[Body language]] * [[Computer processing of body language]] ** [[Facial expression capture]] ** [[Facial expression databases]] ** [[Facial expression detection]] ** [[Facial recognition system]] * [[Display rules]] * [[Emoticon]] (Facial Expression Markup Language) * [[Emotion classification]] * [[Laughter]] * [[Gelotology]] * [[Metacommunicative competence]] * [[Thought Moments]] == References == {{Reflist}} * {{Cite journal|last1=Salvadori|first1=Eliala A.|last2=Colonnesi|first2=Cristina|last3=Vonk|first3=Heleen S.|last4=Oort|first4=Frans J.|last5=Aktar|first5=Evin|date=2021-01-14|title=Infant Emotional Mimicry of Strangers: Associations with Parent Emotional Mimicry, Parent-Infant Mutual Attention, and Parent Dispositional Affective Empathy|journal=International Journal of Environmental Research and Public Health|language=en|volume=18|issue=2|pages=654|doi=10.3390/ijerph18020654|pmid=33466629|pmc=7828673|doi-access=free}} == External links == {{Wikiquote}} {{Commons category|Facial expressions}} * [http://www.kasrl.org/facial_expression.html Facial Expressions Resources Page] contains links to research concerning facial expressions * [https://web.archive.org/web/20100425054843/http://allbellspalsy.info/ Bell's Palsy information site] Information for sufferers of facial palsy/facial paralysis * [http://www.jmir.org/2012/5/e136/ The Umeå University Database of Facial Expressions], October 12, 2012. ''Journal of Medical Internet Research'' * [http://www.kasrl.org/jaffe.html The JAFFE Database of Facial Expressions] * [http://www.scholarpedia.org/article/Facial_expression_analysis Facial expression analysis] [[David Matsumoto]] and [[Paul Ekman]] [[Scholarpedia]], 3(5):4237. [[doi:10.4249/scholarpedia.4237]] {{Authority control}} {{Nonverbal communication}} {{Evolutionary psychology}} [[Category:Facial expressions| ]] [[Category:Anatomical simulation]] [[Category:Emotion]] [[Category:Evolutionary psychology]]
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