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Jealousy generally refers to the thoughts or feelings of insecurity, fear, and concern over a relative lack of possessions.
Jealousy can consist of one or more emotions such as anger, resentment, inadequacy, helplessness or disgust. In its original meaning, jealousy is distinct from envy, though the two terms have popularly become synonymous in the English language, with jealousy now also taking on the definition originally used for envy alone.
Jealousy is a typical experience in human relationships, and it has been observed in infants as young as five months. Some researchers claim that jealousy is seen in all cultures and is a universal trait. However, others claim jealousy is a culture-specific emotion.
Jealousy can either be suspicious or reactive, and it is often reinforced as a series of particularly strong emotions and constructed as a universal human experience. Psychologists have proposed several models to study the processes underlying jealousy and have identified factors that result in jealousy. Sociologists have demonstrated that cultural beliefs and values play an important role in determining what triggers jealousy and what constitutes socially acceptable expressions of jealousy. Biologists have identified factors that may unconsciously influence the expression of jealousy.
Throughout history, artists have also explored the theme of jealousy in photographs, paintings, films, songs, plays, poems, and books, and theologians have offered religious views of jealousy based on the scriptures of their respective faiths.
The word stems from the French jalousie, formed from jaloux (jealous), and further from Low Latin zelosus (full of zeal), in turn from the Greek word ζήλος (zēlos), sometimes "jealousy", but more often in a positive sense "emulation, ardour, zeal" (with a root connoting "to boil, ferment"; or "yeast"). The "biblical language" zeal would be known as "tolerating no unfaithfulness" while in middle English zealous is good. One origin word gelus meant "Possessive and suspicious" the word then turned into jelus.
People do not express jealousy through a single emotion or a single behavior. They instead express jealousy through diverse emotions and behaviors, which makes it difficult to form a scientific definition of jealousy. Scientists instead define jealousy in their own words, as illustrated by the following examples:
- "Romantic jealousy is here defined as a complex of thoughts, feelings, and actions which follow threats to self-esteem and/or threats to the existence or quality of the relationship, when those threats are generated by the perception of potential attraction between one's partner and a (perhaps imaginary) rival." 
- "Jealousy, then, is any aversive reaction that occurs as the result of a partner's extradyadic relationship that is considered likely to occur." 
- "Jealousy is conceptualized as a cognitive, emotional, and behavioral response to a relationship threat. In the case of sexual jealousy, this threat emanates from knowing or suspecting that one's partner has had (or desires to have) sexual activity with a third party. In the case of emotional jealousy, an individual feels threatened by her or his partner's emotional involvement with and/or love for a third party." 
- "Jealousy is defined as a defensive reaction to a perceived threat to a valued relationship, arising from a situation in which the partner's involvement with an activity and/or another person is contrary to the jealous person's definition of their relationship." 
- "Jealousy is triggered by the threat of separation from, or loss of, a romantic partner, when that threat is attributed to the possibility of the partner's romantic interest in another person." 
These definitions of jealousy share two basic themes. First, all the definitions imply a triad composed of a jealous individual, a partner, and a perception of a third party or rival. Second, all the definitions describe jealousy as a reaction to a perceived threat to the relationship between two people, or a dyad. Jealous reactions typically involve aversive emotions and/or behaviors that are assumed to be protective for their attachment relationships. These themes form the essential meaning of jealousy in most scientific studies.
Popular culture uses the word jealousy as a synonym for envy. Many dictionary definitions include a reference to envy or envious feelings. In fact, the overlapping use of jealousy and envy has a long history.
The terms are used indiscriminately in such popular 'feelgood' books as Nancy Friday's Jealousy, where the expression 'jealousy' applies to a broad range of passions, from envy to lust and greed. While this kind of usage blurs the boundaries between categories that are intellectually valuable and psychologically justifiable, such confusion is understandable in that historical explorations of the term indicate that these boundaries have long posed problems. Margot Grzywacz's fascinating etymological survey of the word in Romance and Germanic languages asserts, indeed, that the concept was one of those that proved to be the most difficult to express in language and was therefore among the last to find an unambiguous term. Classical Latin used invidia, without strictly differentiating between envy and jealousy. It was not until the postclassical era that Latin borrowed the late and poetic Greek word zelotypia and the associated adjective zelosus. It is from this adjective that are derived French jaloux, Provençal gelos, Italian geloso, and Spanish celoso. 
Perhaps the overlapping use of jealousy and envy occurs because people can experience both at the same time. A person may envy the characteristics or possessions of someone who also happens to be a romantic rival. In fact, one may even interpret romantic jealousy as a form of envy. A jealous person may envy the affection that his or her partner gives to a rival — affection the jealous person feels entitled to himself or herself. People often use the word jealousy as a broad label that applies to both experiences of jealousy and experiences of envy.
Although popular culture often uses jealousy and envy as synonyms, modern philosophers and psychologists have argued for conceptual distinctions between jealousy and envy. For example, philosopher John Rawls distinguishes between jealousy and envy on the ground that jealousy involves the wish to keep what one has, and envy the wish to get what one does not have. Thus, a child is jealous of her parents' attention to a sibling, but envious of her friend's new bicycle. Psychologists Laura Guerrero and Peter Andersen have proposed the same distinction. They claim the jealous person "perceives that he or she possesses a valued relationship, but is in danger of losing it or at least of having it altered in an undesirable manner," whereas the envious person "does not possess a valued commodity, but wishes to possess it." Gerrod Parrott draws attention to the distinct thoughts and feelings that occur in jealousy and envy.
The common experience of jealousy for many people may involve:
The experience of envy involves:
Parrot acknowledges that people can experience envy and jealousy at the same time. Feelings of envy about a rival can even intensify the experience of jealousy. Still, the differences between envy and jealousy in terms of thoughts and feelings justify their distinction in philosophy and science.
Jealousy involves an entire "emotional episode," including a complex "narrative": the circumstances that lead up to jealousy, jealousy itself as emotion, any attempt at self regulation, subsequent actions and events and the resolution of the episode. The narrative can originate from experienced facts, thoughts, perceptions, memories, but also imagination, guess and assumptions. The more society and culture matter in the formation of these factors, the more jealousy can have a social and cultural origin. By contrast, jealousy can be a "cognitively impenetrable state", where education and rational belief matter very little.
One possible explanation of the origin of jealousy in evolutionary psychology is that the emotion evolved in order to maximize the success of our genes: it is a biologically based emotion selected to foster the certainty about the paternity of one’s own offspring. A jealous behavior, in men, is directed into avoiding sexual betrayal and a consequent waste of resources and effort in taking care of someone else’s offspring. There are, additionally, cultural or social explanations of the origin of jealousy. According to one, the narrative from which jealousy arises can be in great part made by the imagination. Imagination is strongly affected by a person's cultural milieu. The pattern of reasoning, the way one perceives situations, depends strongly on cultural context. It has elsewhere been suggested that jealousy is in fact a secondary emotion in reaction to one's needs not being met, be those needs for attachment, attention, reassurance or any other form of care that would be otherwise expected to arise from that primary romantic relationship.
While mainstream psychology considers sexual arousal through jealousy a paraphilia, some authors on sexuality have argued that jealousy in manageable dimensions can have a definite positive effect on sexual function and sexual satisfaction. Studies have also shown that jealousy sometimes heightens passion towards partners and increases the intensity of passionate sex.
Jealousy in children and teenagers has been observed more often in those with low self-esteem and can evoke aggressive reactions. One such study suggested that developing intimate friends can be followed by emotional insecurity and loneliness in some children when those intimate friends interact with others. Jealousy is linked to aggression and low self-esteem. Research by Sybil Hart, Ph.D., at Texas Tech University indicates that children are capable of feeling and displaying jealousy at as young as six months. Infants showed signs of distress when their mothers focused their attention on a lifelike doll. This research could explain why children and infants show distress when a sibling is born, creating the foundation for sibling rivalry.
In addition to traditional jealousy comes Obsessive Jealousy, which can be a form of Obsessive Compulsive Disorder. This jealousy is characterized by obsessional jealousy and thoughts of the partner.
Anthropologists have claimed that jealousy varies across cultures. Cultural learning can influence the situations that trigger jealousy and the manner in which jealousy is expressed. Attitudes toward jealousy can also change within a culture over time. For example, attitudes toward jealousy changed substantially during the 1960s and 1970s in the United States. People in the United States adopted much more negative views about jealousy. As men and women became more equal it became less appropriate or acceptable to express jealousy.
Romantic jealousy arises as a result of romantic interest. It is defined as “a complex of thoughts, feelings, and actions that follow threats to self-esteem and/or threats to the existence or quality of the relationship when those threats are generated by the perception of a real or potential romantic attraction between one's partner and a (perhaps imaginary) rival.” Different from sexual jealousy, romantic jealousy is triggered by threats to self and relationship (rather than sexual interest in another person). Factors, such as feelings of inadequacy as a partner, sexual exclusivity, and having put relatively more effort into the relationship, are positively related to relationship jealousy in both genders.
As romantic jealousy is a complicated reaction that has multiple components, i.e., thoughts, feelings, and actions, one aspect of romantic jealousy that is under study is communicative responses. Communicative responses serve three critical functions in a romantic relationship, i.e., reducing uncertainty, maintaining or repairing relationship, and restoring self-esteem. If done properly, communicative responses can lead to more satisfying relationships after experiencing romantic jealousy.
There are two subsets of communicative responses: interactive responses and general behavior responses. Interactive responses is face-to-face and partner-directed while general behavior responses may not occur interactively. Guerrero and colleagues further categorize multiple types of communicative responses of romantic jealousy. Interactive responses can be broken down to six types falling in different places on continua of threat and directness:
Guerrero and colleagues have also proposed five general behavior responses. The five sub-types differ in whether a response is 1) directed at partner or rival(s), 2) directed at discovery or repair, and 3) positively or negatively valenced:
While some of these communicative responses are destructive and aggressive, e.g., distributive communication and active distancing, some individuals respond to jealousy in a more constructive way. Integrative communication, compensatory restoration, and negative affect expression have been shown to lead to positive relation outcomes. One factor that affects the type of communicative responses elicited in an individual is emotions. Jealousy anger is associated with more aggressive communicative response while irritation tends to lead to more constructive communicative behaviors.
Researchers also believe that when jealousy is experienced it can be caused by differences in understanding the commitment level of the couple, rather than directly being caused by biology alone. The research identified that if a person valued long-term relationships more than being sexually exclusive, those individuals were more likely to demonstrate jealousy over emotional rather than physical infidelity.
Through a study conducted in three Spanish-Speaking countries, it was determined that Facebook jealousy also exists. This Facebook jealousy ultimately leads to increased relationship jealousy and study participants also displayed decreased self esteem as a result of the Facebook jealousy.
Sexual jealousy may be triggered when a person's significant other displays sexual interest in another person. The feeling of jealousy may be just as powerful if one partner suspects the other is guilty of infidelity. Fearing that their partner will experience sexual jealousy the person who has been unfaithful may lie about their actions in order to protect their partner. Experts often believe that sexual jealousy is in fact a biological imperative. It may be part of a mechanism by which humans and other animals ensure access to the best reproductive partners.
It seems that male jealousy in heterosexual relationships may be influenced by their female partner's phase in her menstrual cycle. In the period around and shortly before ovulation, males are found to display more mate-retention tactics, which are linked to jealousy. Furthermore, a male is more likely to employ mate-retention tactics if their partner shows more interest in other males, which is more likely to occur in the pre-ovulation phase.
According to the Parental Investment Model based on parental investment theory, more men than women ratify sex differences in jealousy. In addition, more women over men consider emotional infidelity (fear of abandonment) as more distressing than sexual infidelity. According to the attachment theory, sex and attachment style makes significant and unique interactive contributions to the distress experienced. Security within the relationship also heavily contributes to one’s level of distress. These findings imply that psychological and cultural mechanisms regarding sex differences may play a larger role than expected. The attachment theory also claims to reveal how infants' attachment patterns are the basis for self-report measures of adult attachment. Although there are no sex differences in childhood attachment, individuals with dismissing behavior were more concerned with the sexual aspect of relationships. As a coping mechanism these individuals would report sexual infidelity as more harmful. Moreover, research shows that audit attachment styles strongly conclude with the type of infidelity that occurred. Thus psychological and cultural mechanisms are implied as unvarying differences in jealousy that play a role in sexual attachment.
Emotional jealousy was predicted to be nine times more responsive in females than in males. The emotional jealousy predicted in females also held turn to state that females experiencing emotional jealousy are more violent than men experiencing emotional jealousy.
There are distinct emotional responses to gender differences in romantic relationships. For example, due to paternity uncertainty in males, jealousy increases in males over sexual infidelity rather than emotional. According to research more women are likely to be upset by signs of resource withdraw (i.e. another female) than by sexual infidelity. A large amount of data supports this notion. However, one must consider for jealousy the life stage or experience one encounters in reference to the diverse responses to infidelity available. Research states that a componential view of jealousy consist of specific set of emotions that serve the reproductive role. However, research shows that both men and women would be equally angry and point the blame for sexual infidelity, but women would be more hurt by emotional infidelity. Despite this fact, anger surfaces when both parties involved is responsible for some type of uncontrollable behavior, sexual conduct is not exempt. Some behavior and actions are controllable such as sexual behavior. However hurt feelings are activated by relationship deviation. No evidence is known to be sexually dimorphic in both college and adult convenience samples.[clarification needed] The Jealousy Specific Innate Model (JSIM) proved to not be innate, but may be sensitive to situational factors. As a result, it may only activate at stages. One study discovered serious relationships are reserved for older adults rather than undergraduates. For example, it was predicted that male jealousy decreases as females reproductive values decreases.
A second possibility that the JSIM effect is not innate but is cultural. Differences have been highlighted in socio-economic status specific such as the divide between high school and collegiate individuals. Moreover, individuals of both genders were angrier and blamed their partners more for sexual infidelities but were more hurt by emotional G. Jealousy is composed of lower-level emotional states (e.g., anger and hurt) which may be triggered by a variety of events, not by differences in individuals' life stage. Although research has recognized the importance of early childhood experiences for the development of competence in intimate relationships, early family environment is recently being examined as we8). Research on self-esteem and attachment theory suggest that individuals internalize early experiences within the family which subconsciously translates into their personal view of worth of themselves and the value of being close to other individuals, especially in an interpersonal relationship.
A study by researches at the University of California, San Diego, replicated jealousy studies done on humans on canines. They reported, in a paper published in PLOS ONE in 2014, that a significant number of dogs exhibited jealous behaviors when their human companions paid attention to dog-like toys, compared to when their human companions paid attention to nonsocial objects.
Artistic depictions of jealousy occur in fiction, films, and other art forms such as painting and sculpture. Jealousy is a common theme in literature, art, theatre, and film. Often, it is presented as a demonstration of particularly deep feelings of love, rather than a destructive obsession.
A study done by Ferris, Smith, Greenberg, and Smithlooked into the way people saw dating and romantic relationships based on how many reality dating shows they watched. People who spent a large amount of time watching these reality dating shows "endorsed" or supported the "dating attitudes" that would be shown on the show. While the other people who do not spend time watching reality dating shows did not mirror the same ideas.This means if someone watches a reality dating show that displays men and women reacting violently or aggressively towards their partner due to jealousy they can mirror that. This is reflected in romantic movies as well.Jessica R. Frampton conducted a study looking into romantic jealousy in movies. The study found that there were "230 instances of romantic jealousy were identified in the 51 top-grossing romantic comedies from 2002–2014" Some of the films did not display romantic jealousy however, some featured many examples of romantic jealousy.This was due to the fact that some of the top grossing movies did not contain a rival or romantic competition.While others such as Forgetting Sarah Marshal was said to contain "19 instances of romantic jealousy."Out of the 230 instances 58% were reactive jealousy while 31% showed possessive jealousy.The last 11% displayed anxious jealousy it was seen the least in all 230 cases.Out of the 361 reactions to the jealousy found 53% were found to be "Destructive responses."Only 19% of responses were constructive while 10% showed avoidant responses.The last 18% were considered "rival focused responses" which lead to the finding that "there was a higher than expected number of rival-focused responses to possessive jealousy."
Jealousy in religion examines how the scriptures and teachings of various religions deal with the topic of jealousy. Religions may be compared and contrasted on how they deal with two issues: concepts of divine jealousy, and rules about the provocation and expression of human jealousy.
Main Article: Jealousy in Four Nations: A Cross-Cultural Analysis
A study was done in order to cross examine jealousy among four different cultures.  The four cultures were chosen to try to reveal the difference in expression when moving from culture to culture. These four cultures were Ireland, Thailand, India and the United States. The overall findings discovered that in male dominate cultures are more likely to express and reveal jealousy than other cultures. This was proven when the survey found that Thais are less likely to express jealousy then the other three cultures. This is because the men in these cultures are rewarded in a way for showing jealousy due to the fact that some women interpret it as love. This can also be seen when watching romantic comedies when males show they are jealous of a rival or emotionally jealous women perceive it as men caring more.
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