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Social rejection occurs when an individual is deliberately excluded from a social relationship or social interaction for social rather than practical reasons. The topic includes both interpersonal rejection (or peer rejection) and romantic rejection. A person can be rejected on an individual basis or by an entire group of people. Furthermore, rejection can be either active, by bullying, teasing, or ridiculing, or passive, by ignoring a person, or giving the "silent treatment." The experience of being rejected is subjective for the recipient, and it can be perceived when it is not actually present. The word ostracism is often used for the process (in Ancient Greece ostracism was voting into temporary exile).
Although humans are social beings, some level of rejection is an inevitable part of life. Nevertheless, rejection can become a problem when it is prolonged or consistent, when the relationship is important, or when the individual is highly sensitive to rejection. Rejection by an entire group of people can have especially negative effects, particularly when it results in social isolation.
The experience of rejection can lead to a number of adverse psychological consequences such as loneliness, low self-esteem, aggression, and depression. It can also lead to feelings of insecurity and a heightened sensitivity to future rejection.
Rejection may be emotionally painful because of the social nature of human beings and the need of social interaction between other humans is essential. Abraham Maslow and other theorists have suggested that the need for love and belongingness is a fundamental human motivation. According to Maslow, all humans, even introverts, need to be able to give and receive affection to be psychologically healthy.
Psychologists believe that simple contact or social interaction with others is not enough to fulfill this need. Instead, people have a strong motivational drive to form and maintain caring interpersonal relationships. People need both stable relationships and satisfying interactions with the people in those relationships. If either of these two ingredients is missing, people will begin to feel lonely and unhappy. Thus, rejection is a significant threat. In fact, the majority of human anxieties appear to reflect concerns over social exclusion.
Being a member of a group is also important for social identity, which is a key component of the self-concept. Mark Leary of Duke University has suggested that the main purpose of self-esteem is to monitor social relations and detect social rejection. In this view, self-esteem is a sociometer which activates negative emotions when signs of exclusion appear.
Social psychological research confirms the motivational basis of the need for acceptance. Specifically, fear of rejection leads to conformity to peer pressure (sometimes called normative influence), and compliance to the demands of others. Our need for affiliation and social interaction appears to be particularly strong when we are under stress.
Peer rejection has been measured using sociometry and other rating methods. Studies typically show that some children are popular, receiving generally high ratings, many children are in the middle, with moderate ratings, and a minority of children are rejected, showing generally low ratings. One measure of rejection asks children to list peers they like and dislike. Rejected children receive few "like" nominations and many "dislike" nominations. Children classified as neglected receive few nominations of either type.
According to Karen Bierman of Pennsylvania State University, most children who are rejected by their peers display one or more of the following behavior patterns:
Bierman states that well-liked children show social savvy and know when and how to join play groups. Children who are at risk for rejection are more likely to barge in disruptively, or hang back without joining at all. Aggressive children who are athletic or have good social skills are likely to be accepted by peers, and they may become ringleaders in the harassment of less skilled children. Minority children, children with disabilities, or children who have unusual characteristics or behavior may face greater risks of rejection. Depending on the norms of the peer group, sometimes even minor differences among children lead to rejection or neglect. Children who are less outgoing or simply prefer solitary play are less likely to be rejected than children who are socially inhibited and show signs of insecurity or anxiety.
Peer rejection, once established, tends to be stable over time, and thus difficult for a child to overcome. Researchers have found that active rejection is more stable, more harmful, and more likely to persist after a child transfers to another school, than simple neglect. One reason for this is that peer groups establish reputational biases that act as stereotypes and influence subsequent social interaction. Thus, even when rejected and popular children show similar behavior and accomplishments, popular children are treated much more favorably.
Rejected children are likely to have lower self-esteem, and to be at greater risk for internalizing problems like depression. Some rejected children display externalizing behavior and show aggression rather than depression. The research is largely correlational, but there is evidence of reciprocal effects. This means that children with problems are more likely to be rejected, and this rejection then leads to even greater problems for them. Chronic peer rejection may lead to a negative developmental cycle that worsens with time.
Rejected children are more likely to be bullied and to have fewer friends than popular children, but these conditions are not always present. For example, some popular children do not have close friends, whereas some rejected children do. Peer rejection is believed to be less damaging for children with at least one close friend.
An analysis of 15 school shootings between 1995 and 2001 found that peer rejection was present in all but two of the cases (87%). The documented rejection experiences included both acute and chronic rejection and frequently took the form of ostracism, bullying, and romantic rejection. The authors stated that although it is likely that the rejection experiences contributed to the school shootings, other factors were also present, such as depression, poor impulse control, and other psychopathology.
There are programs available for helping children who suffer from social rejection. One large scale review of 79 controlled studies found that social skills training is very effective (r = .40 effect size), with a 70% success rate, compared to 30% success in control groups. There was a decline in effectiveness over time, however, with follow-up studies showing a somewhat smaller effect size (r = .35).
Laboratory research has found that even short-term rejection from strangers can have powerful (if temporary) effects on an individual. In several social psychology experiments, people chosen at random to receive messages of social exclusion become more aggressive, more willing to cheat, less willing to help others, and more likely to pursue short-term over long-term goals. Rejection appears to lead very rapidly to self-defeating and antisocial behavior.
Researchers have also investigated how the brain responds to social rejection. One study found that the dorsal anterior cingulate cortex is active when people are experiencing both physical pain and "social pain," in response to social rejection. A subsequent experiment, also using fMRI neuroimaging, found that three regions become active when people are exposed to images depicting rejection themes. These areas are the posterior cingulate, the parahippocampal gyrus, and the dorsal anterior cingulate cortex. Furthermore, individuals who are high in rejection sensitivity (see below) show less activity in the left prefrontal cortex and the right dorsal superior frontal gyrus, which may indicate less ability to regulate emotional responses to rejection.
A recent experiment at the University of California at Berkeley found that individuals with a combination of low self-esteem and low attentional control are more likely to exhibit eye-blink startle responses while viewing rejection themed images. These findings indicate that people who feel bad about themselves are especially vulnerable to rejection, but that people can also control and regulate their emotional reactions.
A study at Miami University indicated that individuals who recently experienced social rejection were better than both accepted and control participants in their ability to discriminate between real and fake smiles. Though both accepted and control participants were better than chance (they did not differ from each other), rejected participants were much better at this task, nearing 80% accuracy. This study is noteworthy in that it is one of the few cases of a positive or adaptive consequence of social rejection.
A common experimental technique is the "ball toss" paradigm, which was developed by Kip Williams and his colleagues at Purdue University. This procedure involves a group of three people tossing a ball back and forth. Unbeknownst to the actual participant, two members of the group are working for the experimenter and following a pre-arranged script. In a typical experiment, half of the subjects will be excluded from the activity after a few tosses and never get the ball again. Only a few minutes of this treatment are sufficient to produce negative emotions in the target, including anger and sadness. This effect occurs regardless of self-esteem and other personality differences.
Gender differences have been found in these experiments. In one study, women showed greater nonverbal engagement whereas men disengaged faster and showed face-saving techniques, such as pretending to be uninterested. The researchers concluded that women seek to regain a sense of belonging whereas men are more interested in regaining self-esteem.
A computerized version of the task known as "cyberball" has also been developed and leads to similar results. Cyberball is a virtual ball toss game where the participant is led to believe they are playing with two other participants sitting at computers elsewhere who can toss the ball to either player. The participant is included in the game for the first few minutes, but then excluded by the other players for the remaining three minutes. This simple and short time period of ostracism has been found to produce significant increases to self-reported levels of anger and sadness, as well as lowering levels of the four needs. These effects have been found even when the participant is ostracised by out-group members, when the out-group member is a despised person such as someone in the Ku Klux Klan, when they know the source of the ostracism is just a computer, and even when being ostracised means they will be financially rewarded and being included would incur a financial cost.
Surprisingly, people feel rejected even when they know they are only playing against the computer. A recent set of experiments using cyberball demonstrated that rejection impairs will power or self-regulation. Specifically, people who are rejected are more likely to eat cookies and less likely to drink an unpleasant tasting beverage that they are told is good for them. These experiments also showed that the negative effects of rejection last longer in individuals who are high in social anxiety.
Most of the research on the psychology of ostracism has been conducted by the social psychologist Kip Williams. He and his colleagues have devised a model of ostracism which provides a framework to show the complexity in the varieties of ostracism and the processes of its effects. There he theorises that ostracism can potentially be so harmful that we have evolved an efficient warning system to immediately detect and respond to it.
In the animal kingdom as well as in primitive human societies, ostracism can lead to death due to the lack of protection benefits and access to sufficient food resources from the group. Living apart from the whole of society also means not having a mate, so being able to detect ostracism would be a highly adaptive response to ensure survival and continuation of the genetic line.
It is proposed that ostracism uniquely poses a threat to four fundamental human needs; the need to belong, the need for control in social situations, the need to maintain high levels of self-esteem, and the need to have a sense of a meaningful existence. A threat to these needs produces psychological distress and pain. Thus, people are motivated to remove this pain with behaviours aimed at reducing the likelihood of others ostracising them any further and increasing their inclusionary status.
In contrast to the study of childhood rejection, which primarily examines rejection by a group of peers, some researchers focus on the phenomenon of a single individual rejecting another in the context of a romantic relationship. In both teenagers and adults, romantic rejection occurs when a person refuses the romantic advances of another, ignores/avoids or is repulsed by someone who is romantically interested in them, or unilaterally ends an existing relationship. The state of unrequited love is a common experience in youth, but mutual love becomes more typical as people get older.
Romantic rejection is a painful, emotional experience that appears to trigger a response in the caudate nucleus of the brain, and associated dopamine and cortisol activity. Subjectively, rejected individuals experience a range of negative emotions, including frustration, intense anger, jealousy, and eventually, resignation, despair, and possible long-term depression.
Men are significantly more likely than women to react with rage and aggression when rejected. Every year, over a million American women are stalked, and the majority are stalked by a former boyfriend, husband, or live-in partner. 80% of these women are physically attacked by their stalker. Researchers in a variety of countries have demonstrated that stalkers are more likely to be male, and that male stalkers are more likely to become violent.
One reason why romantic rejection is so common in society is a tendency called falling upward. People generally desire mates that are higher than themselves on such characteristics as social status and physical attractiveness (a desire which corresponds with the practice of hypergamy), and are usually unattracted to and even repulsed by ones who are lower. When someone falls in love with a person who has aspirations, qualities, achievements, etc., that are higher than their own, that love is less likely to be reciprocated, potentially leading to rejection.
Karen Horney was the first theorist to discuss the phenomenon of rejection sensitivity. She suggested that it is a component of the neurotic personality, and that it is a tendency to feel deep anxiety and humiliation at the slightest rebuff. Simply being made to wait, for example, could be viewed as a rejection and met with extreme anger and hostility.
Albert Mehrabian developed an early questionnaire measure of rejection sensitivity. Mehrabian suggested that sensitive individuals are reluctant to express opinions, tend to avoid arguments or controversial discussions, are reluctant to make requests or impose on others, are easily hurt by negative feedback from others, and tend to rely too much on familiar others and situations so as to avoid rejection.
A more recent (1996) definition of rejection sensitivity is the tendency to "anxiously expect, readily perceive, and overreact" to social rejection. People differ in their readiness to perceive and react to rejection. The causes of individual differences in rejection sensitivity are not well understood. Because of the association between rejection sensitivity and neuroticism, there is a likely a genetic predisposition. Others posit that rejection sensitivity stems from early attachment relationships and parental rejection; also peer rejection is thought to play a role. Bullying, an extreme form of peer rejection, is likely connected to later rejection sensitivity. However, there is no conclusive evidence for any of these theories.
Social rejection has a large impact on a person’s health. Baumeister and Leary originally suggested that an unsatisfied need to belong would inevitably lead to problems in behavior as well as mental and physical health . Corroboration of these assumptions about behavior defecits were seen by John Bowlby in his research . Numerous studies have found that being socially rejected leads to an increase in levels of anxiety . Additionally, the level of depression a person feels as well as the amount they care about their social relationships is directly proportional to the level of rejection they perceive . Rejection has an impact on the emotional health and well being of a person as well. Overall, experiments show that those who have been rejected will suffer from more negative emotions and have less positive emotions than those who have been accepted or those who were in neutral or control conditions.
In addition to the emotional response to rejection, there is a large effect on physical health as well. Having poor relationships and being more frequently rejected is predictive of mortalitly. Also, as long as a decade after the marriage ends, divorced women have higher rates of illness than their non-married or currently married counterparts . The immune system tends to take a very impactful hit when a person experiences social rejection. This can cause severe problems for those with diseases such as HIV. One study by Cole, Kemeny, and Taylor investigated the differences in the disease progression of HIV positive gay men who were sensitive to rejection compared to those who were not considered rejection sensitive. The study, which took place over nine years, indicated significantly faster rate of low T helper cells, therefore leading to an earlier AIDS diagnosis. Interestingly, they also found that those patients who were more sensitive to rejection died from the disease an average of 2 years earlier than their non-rejection sensitive counterparts.
Other aspects of health are also affected by rejection. Both systolic and diastolic blood pressure increase upon imagining a rejection scenario. Those who are socially rejected have an increased likelihood of suffering from tuberculosis, as well as dying by suicide . Rejection and isolation were found to impact levels of pain following an operation as well as other physical forms of pain . MacDonald and Leary theorize that rejection and exclusion cause physical pain because that pain is a warning sign to help us survive. As we developed into social creatures, social interactions and relationships became necessary to our survival, and the physical pain systems already exsited within our bodies.
Artistic depictions of rejection occur in a variety of art forms. One example of rejection in art is Gian Lorenzo Bernini’s sculpture of the Greek deity, Apollo. In this work, the mythical nymph, Daphne depicts the act of rejection. Apollo had been filled with passion for Daphne, but she repeatedly rejected his advances. The sculpture portrays the moment when Daphne cries out for safety from Apollo and as a result is transformed into a laurel tree. Apollo has been defeated and turns away, rejected.
Depictions of rejection also occur in film. One genre of film that most frequently depicts rejection is romantic comedies. In the film He's Just Not That Into You the main characters deal with the challenges of reading and misreading human behavior. This presents a fear of rejection in romantic relationships as reflected in this quote by the character Mary, “And now you have to go around checking all these different portals just to get rejected by seven different technologies. It’s exhausting.” 
Social rejection is also depicted in theatrical plays and musicals. For example, the film Hairspray shares the story of Tracy Turnblad, an overweight 15 year old dancer set in the 1960s. Tracy and her mother are faced with overcoming society’s expectations regarding weight and physical appearances.