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Emotion From Wikipedia, the free encyclopedia (Redirected from Human emotion) Jump to: navigation, search For other uses, see Emotion (disambiguation). "Emotional" redirects here. For other uses see Emotional (disambiguation) Psychology Portal • History AREAS Abnormal Applied Biological Clinical Cognitive Developmental Educational Emotion Evolutionary Forensic Health Industrial/Org Personality Positive Sensory Social LISTS Publications Topics Therapies view • talk Emotion, in its most general definition, is a complex psychophysical process that arises spontaneously, rather than through conscious effort, and evokes either a positive or negative psychological response and physical expressions, often involuntary, related to feelings, perceptions or beliefs about elements, objects or relations between them, in reality or in the imagination. An emotion is often differentiated from a feeling. Contents [hide] 1 Definition of emotion 2 Emotion, Meta-emotion, and Reason 3 Etymology 4 Theoretical traditions 4.1 Somatic theories 4.2 The Cannon-Bard theory 4.3 Cognitive theories 4.4 The evolutionary perspective 5 Emotions in Philosophy of Mind 6 Classification by primary emotions 6.1 Physical responses 7 Brain areas related to emotion 8 Neurobiological theories of emotion 8.1 Primary and secondary emotion 8.2 Positive and negative perception 9 Meta-emotions 10 Computer models of emotion 11 Emotion in animals 12 Sociology of Emotions and Meta-Emotions 13 Notes 14 References 15 Emotion researchers 16 See also 17 External links [edit] Definition of emotion Emotion is complex, and the term has no single universally accepted definition.[1] The study of emotions is part of psychology, neuroscience, and, more recently, artificial intelligence. According to Sloman,[2] emotions are cognitive processes. Some authors emphasize the difference between human emotions and the affective behavior of animals. In Paul D. MacLean's classic Triune brain model, emotions are defined as the responses of the Mammalian cortex. Emotion competes with even more instinctive responses from the Reptilian cortex and the more logical, reasoning neocortex. However, current research on the neural circuitry of emotion suggests that emotion is an essential part of human decision-making and planning, and that the famous distinction made by Descartes between reason and emotion is not as clear as it seems.[3] [edit] Emotion, Meta-emotion, and Reason Emotion is generally regarded by Western civilization as the antithesis of reason. This distinction stems from Western philosophy specifically stoic and Cartesian dualism approaches, and is reflected in common phrases like appeal to emotion or your emotions have taken over. Emotions can be undesired either to the individual experiencing them, but also can be undesired to the other persons, groups of persons, organizations, sub-cultures, and civilisations such as Western civilization, which can be viewed as the emotion being subjected to the individual's or someone else's discouraging meta-emotion about the undesired emotion or can be even repressed by the meta-emotions. Thus one of the most distinctive, and perhaps challenging, facts about human beings is this potential for entanglement, or even opposition, between emotion, meta-emotion, will, and reason. Some state that there is no empirical support for any generalization suggesting the antithesis between reason and emotion: indeed, anger or fear can often be thought of as a systematic response to observed facts. In any case, it is clear that the relation between logic and argument and emotion is one which merits careful study. Emotion as the subject of scientific research has multiple dimensions: behavioral, physiological, subjective, and cognitive. Sloman argues that many emotions are side-effects of the operations of complex mechanisms (e.g. 'alarm' mechanisms) required in animals or machines with multiple motives and limited capacities and resources for coping with a changing and unpredictable world, just as 'thrashing' can sometimes occur as a side-effect of scheduling and memory management mechanisms required in a computer operating system for purposes other than producing thrashing. Such side effects are sometimes useful, but sometimes they are dysfunctional. Other theorists, often influenced by writings of Antonio Damasio argue that emotions themselves are necessary for any intelligent system (natural or artificial). Psychiatrist William Glasser's theory of the human control system states that behavior is composed of four simultaneous components: deeds, ideas, emotions, and physiological states. He asserts that we choose the idea and deed and that the associated emotions and physiological states also occur but cannot be chosen independently. He calls his construct a total behavior to distinguish it from the common concept of behavior. He uses the verbs to describe what is commonly seen as emotion. For example, he uses 'to depress' to describe the total behavior commonly known as depression which, to him, includes depressing ideas, actions, emotions, and physiological states. Dr. Glasser also further asserts that internal choices (conscious or unconscious) cause emotions instead of external stimuli. According to Damasio, feeling can be viewed as the subjective experience of an emotion that arises physiologically in the brain. [4] Many psychologists adopt the ABC model, which defines emotions in terms of three fundamental attributes: A. physiological arousal, B. behavioral expression (e.g. facial expressions), and C. conscious experience, the subjective feeling of an emotion. All three attributes are necessary for a full fledged emotional event, though the intensity of each may vary greatly. Robert Masters makes the following distinctions between affect, feeling and emotion: "As I define them, affect is an innately structured, non-cognitive evaluative sensation that may or may not register in consciousness; feeling is affect made conscious, possessing an evaluative capacity that is not only physiologically based, but that is often also psychologically (and sometimes relationally) oriented; and emotion is psychosocially constructed, dramatized feeling."[5] In pop culture there are sub-cultures which cultivate the expressions of anger and rebelliousness even when they are not really angry, its members encouraging each other to express the anger by internalizing meta-gladness about it. Encouragement (i.e. meta-gladness) and discouragement (i.e. psychological repression) of selected emotions - instead of mere awareness and equal interest in all emotions - can be considered as additional source of organizational climate, family dynamics, psychodynamics, personality traits, and of mental disorders, including depression among others. [edit] Etymology Etymologically, the word emotion is a composite formed from two Latin words. e(x)/out, outward + motio/movement, action, gesture. This classical formation refers to the motivational aspect that causes one to begin, continue, or end bodily movements from a source often hidden from conscious inspection though necessary even for rational actions. The scientific community applies the term to any creature's activity that exhibits complex response traits similar to that of a human. Alternatively some consider the outward movement to refer to immediacy of action rather than motivational source. [edit] Theoretical traditions Several theoretical traditions in emotion research have been offered. These traditions are not mutually exclusive and many researchers incorporate multiple perspectives in their work. [edit] Somatic theories William James in the late 19th century believed that emotional experience is largely due to the experience of bodily changes. These changes might be visceral, postural, or facially expressive. The most basic of these somatic theories is the James-Lange theory. This theory and its derivates state that a changed situation leads to a changed bodily state. It is this bodily state which in turn gives rise to an emotion. Hence the emotion fear upon encountering a bear in the woods would follow from: Spot a bear -> Heart start beating faster; adrenalin is being produced -> The emotion fear arises This approach underlies experiment where through manipulating the bodily state, a desired emotion is induced (e.g. in laughter therapy). [edit] The Cannon-Bard theory Walter Cannon provided empirical evidence against the dominance of the James-Lange theory of the physiological aspects emotions in the second edition of Bodily Changes in Pain, Hunger, Fear and Rage. Cannon and Bard came up with a different account of the relations between emotions and behavior; where a certain situation leads to an emotion; which in turn activates a typical behavior. Here the emotion fear upon encountering a bear in the woods would result in: Spot a bear -> The emotion fear arises -> Run away [edit] Cognitive theories Research in social psychology interprets emotions as a combination of two elements; physiological arousal and cognitive interpretation. The earliest account of such a theory is the Singer-Schachter theory that is based on experiments that varied arousal introducing chemical (adrenaline) and put the participants in different situations. The combination of the appraisal of the situation (cognitive) and whether participants received adrenaline or a placebo together determined the response. In the example of the bear this would lead to: Spot a bear -> Adrenalin is released, hearts starts beating faster -> The sight of a bear is interpreted as being dangerous for the health (note this needs not necessarily be a conscious appraisal) -> The emotion fear arises. Several other theories have a similar ideas, for example, the framework proposed by Nico Frijda where such appraisal leads to action tendencies is related to this idea [edit] The evolutionary perspective A fourth theoretical tradition has been gaining influence once more (see: Cornelius, 1996). This fourth, evolutionary tradition, started in the late 19th century with Charles Darwin's publication of a book on the expression of emotions in man and animals.[6] Darwin's original thesis was that emotions evolved via natural selection for reasons of warning other creatures about your intentions (e.g. a cat with a high back is angry and will strike you unless you back off). Darwin argued that for mankind emotions were no longer functional but are epiphenomena of functional associated habits. Such an evolutionary origin would predict emotions to be cross-culturally universal. Confirmation of this biological origins was provided by Paul Ekman's seminal research on facial expressions in humans. Other research in this area focuses on physical displays of emotion including body language of animals and facial expressions in humans. The increased potential in neuroimaging has allowed investigation of this idea focusing on the working brain itself. Important neurological advances where made from this perspectives in the 1990's by, for example, Joseph LeDoux and Antonio Damasio. [edit] Emotions in Philosophy of Mind In opposition to the traditional Philosophy of Mind that has considered emotions only as non-essential addition, at best giving a flavour, to rational intellectual thought, the authors of naturalistic Philosophy of Mind inspired by prospects of building robots and other autonomous agents are starting to give emotions central role as indispensible constituent for adaptive agency (see DeLancey 2002/2004). [edit] Classification by primary emotions One of the most influential classification approaches in the study of emotion is Robert Plutchik’s eight primary emotions. The emotions that Plutchik lists as primary are: anger fear sadness joy disgust surprise curiosity acceptance Similar to the way primary colors combine, primary emotions are believed to blend together to form the full spectrum of human emotional experience. Plutchik reasons that these eight are primary on evolutionary grounds, by relating each to behavior with survival value. For example: fear motivates flight from danger, anger motivates fighting for survival. They are considered to be part of our biological heritage and built into human nature. Paul Ekman devised a similar list of basic emotions from cross-cultural research on the Fore tribesmen of Papua New Guinea. He found that even members of an isolated, stone age culture could reliably identify the expressions of emotion in photographs of people from cultures which the Fore were not yet familiar, and concluded that the facial expression of some basic emotions is innate. The following is Ekman’s list of basic emotions: anger fear sadness happiness disgust Ekman holds that this lends further support to the view that at least some emotions are primary, innate, and universal in all human beings.[7] Lazarus (1991) similarly offers a taxonomy of 'Core Relational Themes' for various emotions; these help define both function and eliciting conditions. They include a demeaning offense against me and mine for anger; facing an immediate, concrete, and overwhelming physical danger for fear; having experienced an irrevocable loss for sadness; taking in or being too close to an indigestible object or idea (metaphorically speaking) for disgust; making reasonable progress toward the realization of a goal for happiness. [edit] Physical responses Attached to the idea of primary emotions as innate is the notion that each emotion causes a detectable physical response in the body. These responses are often perceived as sensation in the body; for example: Fear is felt as a heightened heartbeat, increased “flinch” response, and increased muscle tension. Anger, based on sensation, seems indistinguishable from fear. Happiness is often felt as an expansive or swelling feeling in the chest and the sensation of lightness or buoyancy, as if standing underwater. Sadness is often experienced as a feeling of tightness in the throat and eyes, and relaxation in the arms and legs. Shame can be felt as heat in the upper chest and face. Desire can be accompanied by a dry throat, heavy breathing, and increased heart rate. In psychotherapy, practitioners of Re-evaluation Counseling propose that distressing emotions are relieved by emotional “discharge”. Hence crying, laughing, sweating, shaking, and trembling.[8] These actions commonly associated emotions, are thought to not be the original sensation, but instead nearly automatic responses that dispel the discomfort of disturbing feelings. [edit] Brain areas related to emotion Emotions are thought to be related to activity in brain areas that direct our attention, motivate our behavior, and determine the significance of what is going on around us. Pioneering work by Broca (1878), Papez (1937), and MacLean (1952) suggested that emotion is related to a group of structures in the center of the brain called the limbic system, which includes the hypothalamus, cingulate cortex, hippocampi, and other structures. More recent research has shown that some of these limbic structures are not as directly related to emotion as others are, while some non-limbic structures have been found to be of greater emotional relevance. The following brain structures are currently thought to be most involved in emotion: Amygdala — The amygdalae are two small, round structures located anterior to the hippocampi near the temporal poles. The amygdalae are involved in detecting and learning what parts of our surroundings are important and have emotional significance. They are critical for the production of emotion, and may be particularly so for negative emotions, especially fear. Prefrontal cortex — The term prefrontal cortex refers to the very front of the brain, behind the forehead and above the eyes. It appears to play a critical role in the regulation of emotion and behavior by anticipating the consequences of our actions. The prefrontal cortex may play an important role in delayed gratification by maintaining emotions over time and organizing behavior toward specific goals. Anterior cingulate — The anterior cingulate cortex (ACC) is located in the middle of the brain, just behind the prefrontal cortex. The ACC is thought to play a central role in attention, and may be particularly important with regard to conscious, subjective emotional awareness. This region of the brain may also play an important role in the initiation of motivated behavior. Ventral striatum — The ventral striatum is a group of subcortical structures thought to play an important role in emotion and behavior. One part of the ventral striatum called the nucleus accumbens is thought to be involved in the experience of goal-directed positive emotion. Individuals with addictions experience increased activity in this area when they encounter the object of their addiction. Insula — The insular cortex is thought to play a critical role in the bodily experience of emotion, as it is connected to other brain structures that regulate the body’s autonomic functions (heart rate, breathing, digestion, etc.). This region also processes taste information and is thought to play an important role in experiencing the emotion of disgust. [edit] Neurobiological theories of emotion This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. (help, get involved!) Unverifiable material may be challenged and removed. This article has been tagged since March 2007. Based on discoveries made through neural mapping of the limbic system, the neurobiological explanation of human emotion is that emotion is a pleasant or unpleasant mental state organized in the limbic system of the mammalian brain. Defined as such, these emotional states are specific manifestations of non-verbally expressed feelings of agreement, amusement, anger, certainty, control, disagreement, disgust, disliking, embarrassment, fear, guilt, happiness, hate, interest, liking, love, sadness, shame, surprise, and uncertainty. If distinguished from reactive responses of reptiles, emotions would then be mammalian elaborations of general vertebrate arousal patterns, in which neurochemicals (e.g., dopamine, noradrenaline, and serotonin) step-up or step-down the brain's activity level, as visible in body movements, gestures, and postures. In mammals, primates, and human beings, feelings are displayed as emotion cues. For example, the human emotion of love is proposed to have evolved from paleocircuits of the mammalian brain (specifically, modules of the cingulated gyrus) designed for the care, feeding, and grooming of offspring. Paleocircuits are neural platforms for bodily expression configured millions of years before the advent of cortical circuits for speech. They consist of pre-configured pathways or networks of nerve cells in the forebrain, brain stem and spinal cord. They evolved prior to the earliest mammalian ancestors, as far back as the jawless fishes, to control motor function. Presumably, before the mammalian brain, life in the non-verbal world was automatic, preconscious, and predictable. The motor centers of reptiles react to sensory cues of vision, sound, touch, chemical, gravity, and motion with pre-set body movements and programmed postures. With the arrival of night-active mammals, circa 180 million years ago, smell replaced vision as the dominant sense, and a different way of responding arose from the olfactory sense, which is proposed to have developed into mammalian emotion and emotional memory. In the Jurassic Period, the mammalian brain invested heavily in olfaction to succeed at night as reptiles slept — one explanation for why olfactory lobes in mammalian brains are proportionally larger than in the reptiles. These odor pathways gradually formed the neural blueprint for what was later to become our limbic brain. [edit] Primary and secondary emotion Primary emotions (i.e., innate emotions, such as fear) "depend on limbic system circuitry," with the amygdala and anterior cingulate gyrus being "key players". Smell carries directly to limbic areas of the mammalian brain via nerves running from the olfactory bulbs to the septum, amygdala, and hippocampus. In the acquatic brain, olfaction was critical for detecting food, foes, and mates from a distance in murky waters. An emotional feeling, like an aroma, has a volatile or "thin-skinned" quality because sensory cells lie on the exposed exterior of the olfactory epithelium (i.e., on the bodily surface itself). A sudden scent, like a whiff of smelling salts, may jolt the mind. The force of a mood is reminiscent of a smell's intensity (e.g., soft and gentle, pungent, or overpowering), and similarly permeates and fades as well. The design of emotion cues, in tandem with the forebrain's olfactory prehistory, suggests that the sense of smell is the neurological model for our emotions. Secondary emotions (i.e., feelings attached to objects [e.g., to dental drills], events, and situations through learning) require additional input, based largely on memory, from the prefrontal and somatosensory cortices. The stimulus may still be processed directly via the amygdala but is now also analyzed in the thought process. Thoughts and emotions are interwoven: every thought, however bland, almost always carries with it some emotional undertone, however subtle. [edit] Positive and negative perception Like aromas, emotions are experienced as either positive or negative, pleasant or unpleasant; emotions do not seem to be neutral. Like odors, feelings come and go, but are logical, and clearly show upon our face in mood signs. It is likely that many emotions evolved from aroma paleocircuits a. in subcortical nuclei (e.g., the paleocortex of the amygdala), and b. in layers of nerve cells within the forebrain's outer covering of neocortex. The latter's stratified architecture resembles that of the olfactory bulb, which is organized in layers as well. [edit] Meta-emotions Main article: Meta-emotion Meta-emotion refers in accordance with the general definition of the preposition "meta-" to second-order emotions about first-order emotions. Meta-emotions can be short-term or long-term. The latter can be a source of discouragement or even psychological repression, or encouragement of specific emotions, having implications for personality traits, psychodynamics, organizational climate, emotional disorders, but also emotional awareness, and emotional intelligence. [edit] Computer models of emotion A flurry of recent work in modeling emotional circuitry and recognition has come out of computer science, engineering, psychology and neuroscience (c.f. Fellous, Armony & LeDoux, 2002). See affective computing Neural network models of emotion recognition [edit] Emotion in animals Main article: Emotion in animals There is increasing support for animals having emotions, although it is still not clear to what amount those are qualitatively the same as human's feelings. [edit] Sociology of Emotions and Meta-Emotions Rational, reasonable, or otherwise effective choosing or decision making are all about differentially valuing, and valuing is based on comparing emotional worth attributed to, and expected from the available alternatives of action – as much as on feelings of confidence or uncertainty in our estimation skills. Affect and logic are social competences and their participation in decision making varies widely among individuals, situations and cultures. Sociologist Randall Collins has stated that a single, specific and long-term emotion named emotional energy is the main motivating force in social life, for love and hatred, investing, working or consuming, rendering cult or waging war.[citation needed] Individually, emotional energy ranges from the highests heights of enthusiasm, self-confidence and initiative to the deepest depths of apathy, depression and retreat. But this does not make it just a psychological emotion. Emotional energy comes from variously successful or failed chains of interaction rituals, that is, patterned social encounters –from conversation or sexual flirtation through Christmas family dinners or office work to mass demonstrations, organizations or revolutions. In the latter, the coupling of participants' behavior synchronizes their nervous systems to the point of generating a collective effervescence, one observable in their mutual focus and emotional entraining, as well as in their loading of emotional and symbolic meaning to entities which subsequently become emblems of the ritual and of the membership group endorsing, preserving, promoting and defending them. Thus social life would be most importantly about generating and distributing emotional energy. Recent research has shown that most areas of social dynamics revolve around some particular emotional cluster. Most significant is classic contribution by Thomas J. Scheff, who established that many cases of social conflict are based on a destructive and often escalating, but stoppable and reversible shame-rage cycle: when someone results or feels shamed by another, their social bond comes under stress. This can be cooperatively acknowledged, talked about and – most effectively when possible - laughed at so their social bond may be restored. Yet, when shame is not acknowledged, but instead negated and repressed, it becomes rage, and rage may drive to aggressive and shaming actions that feed-back negatively on this self-destructive situation. The social management of emotions might be the fundamental dynamics of social cooperation and conflict around resources, complexity, conflict and moral life. It is well-established sociological fact that expression and feeling of the emotion of anger, for example, is strongly discouraged (repressed) in girls and women in many cultures, while fear is discouraged in boys and men. Some cultures and sub-cultures encourage or discourage happiness, sadness, jealousy, excitedness, and many other emotions. The free expression of the emotion of disgust is considered socially unacceptable in many countries. [edit] Notes ^ Emotional Competency discussion of emotion ^ Sloman, Aaron (1981) Why Robots Will Have Emotions. In proc.[1]. University of Sussex, UK ^ Damasio, Antonio (1994) Descartes Error Penguin Putnam, New York, New York ^ Damasio, Antonio (1994) Descartes Error Penguin Putnam, New York, New York ^ Masters, Robert (2000), Compassionate Wrath: Transpersonal Approaches to Anger ^ Darwin, Charles (1872). The Expression of Emotions in Man and Animals. Note: This book was originally published in 1872, but has been reprinted many times thereafter by different publishers ^ Ekman, P. & Friesen, W. V (1969). The repertoire of nonverbal behavior: Categories, origins, usage, and encoding. Semiotica, 1, 49-98. ^ Counseling recovery processes - RC website [edit] References Arbib, M. and Fellous, J-M (editors). (2005) Who Needs Emotions?: The Brain Meets the Robot. Oxford, New York: Oxford University Press. Cornelius, R. (1996). The science of emotion. New Jersey: Prentice Hall. DeLancey, C. (2002/2004). "Passionate Engines: What Emotions Reveal about Mind and Artificial Intelligence", Oxford University Press. Ekman P. (1999). "Basic Emotions". In: T. Dalgleish and M. Power (Eds.). Handbook of Cognition and Emotion. John Wiley & Sons Ltd, Sussex, U.K.:. Ekman P. (1999). "Facial Expressions" in Handbook of Cognition and Emotion. Dalgleish T & Power M, Eds. John Wiley & Sons Ltd. New York, New York. Fellous, J.M., Armony, J.L., & LeDoux, J.E. (2002). "Emotional Circuits and Computational Neuroscience" in 'The handbook of brain theory and neural networks' Second Edition. M.A. Arbib (editor), The MIT Press. [2] Frijda, Nico H. (1986). The Emotions. Maison des Sciences de l'Homme and Cambridge University Press. [3] Jaeger, C., & Bartsch, A. (2006), "Meta-emotions". Grazer Philosophische Studien, 73, 179–204. Lazarus, R. (1991). "Emotion and adaptation". New York: Oxford University Press. LeDoux, J.E. (1986). The neurobiology of emotion. Chap. 15 in J E. LeDoux & W. Hirst (Eds.) Mind and Brain: dialogues in cognitive neuroscience. New York: Cambridge. Plutchik, R. (1980). A general psychoevolutionary theory of emotion. In R. Plutchik & H. Kellerman (Eds.), Emotion: Theory, research, and experience: Vol. 1. Theories of emotion (pp. 3-33). New York: Academic. Moore, S. C. & Oaksford, M. (2002) Emotional Cognition: From Brain to Behaviour. Amsterdam: John Benjamin’s Publishing Company. [edit] Emotion researchers William James Charles Darwin Ivan Pavlov James Papez Paul D. MacLean Paul Ekman Antonio Damasio Robert Plutchik Joseph LeDoux Robert Zajonc Baruch Spinoza Klaus Scherer Richard Lazarus Lisa Feldman Barrett Gerald Clore [edit] See also Find more information on Emotion by searching Wikipedia's sister projects Dictionary definitions from Wiktionary Textbooks from Wikibooks Quotations from Wikiquote Source texts from Wikisource Images and media from Commons News stories from Wikinews Learning resources from Wikiversity Affective neuroscience Affective science Anticipatory Grief Emotional dysregulation — as in a borderline personality Emotion and memory List of emotions Empathy Emotional bias Emotional distance Descartes' Error Emotional conflict Emotional Intelligence Meta-emotion Philosophy of Mind [edit] External links An emotion research page at Salk Institute, maintained by Jean-Marc Fellous and Eva Hudlicka The affective computing portal Socially intelligent agents page Low emotional intelligence and alexithymia [hide]v • d • eEmotions Alertness • Acceptance • Affection • Ambivalence • Anger • Angst • Anticipation • Anxiety • Apathy • Bitterness • Boredom • Calmness • Compassion • Contempt • Contentment • Confusion • Depression • Despair • Disappointment • Disgust • Doubt • Ecstasy • Embarrassment • Emptiness • Enmity • Enthusiasm • Envy • Epiphany • Euphoria • Fanaticism • Fear • Frustration • Gratification • Gratitude • Grief • Guilt • Happiness • Hate • Homesickness • Hope • Horror • Humiliation • Jealousy • Limerence • Loneliness • Love • Lust • Melancholia • Panic • Patience • Pity • Pride • Rage • Regret • Remorse • Repentance • Righteous indignation • Self-pity • Shame • Shyness • Suffering • Surprise Retrieved from "http://en.wikipedia.org/wiki/Emotion" Categories: Articles lacking sources from March 2007 | All articles lacking sources | Articles with unsourced statements since February 2007 | All articles with unsourced statements | Emotion | Psychology | Limbic system | Motivation ViewsArticle Discussion Edit this page History Personal toolsSign in / create account Navigation Main page Contents Featured content Current events Random article interaction About Wikipedia Community portal Recent changes File upload wizard Contact us Make a donation Help Search Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this article In other languages العربية Български Česky Dansk Deutsch Eesti Español Esperanto Français Galego 한국어 Hrvatski Ido Italiano עברית Македонски Nederlands 日本語 ‪Norsk (bokmål)‬ Polski Português Русский Shqip Simple English Slovenščina Српски / Srpski Suomi தமிழ் Türkçe Українська ייִדיש 中文 This page was last modified 12:21, 26 June 2007. 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