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Peer group
During adolescence, peer groups tend to face dramatic changes. Adolescents tend to spend more time with their peers and have less adult supervision. Adolescents’ communication shifts during this time as well. They prefer to talk to about school and their careers with their parents, and they enjoy talking about sex and other interpersonal relationships with their peers. Children look to join peer groups who accept them, even if the group is involved in negative activities. Children are less likely to accept those who are different from them. Adolescents begin to form cliques and crowdspeers. Cliques are small groups typically defines by common interests or simply by friendship. Cliques typically have 6-10 members and tend to be formed by age, gender, race, and social class. Clique members are usually the same in terms of academics, risk behaviors, and aggressionpeers. Being part of a clique is good during adolescents because it contributes to the overall well being and competence. However, crowds are larger, more vaguely defined groups. Crowds serve as peer groups, and they increase in importance during early adolescence, and decrease by late adolescentspeers. The level of involvement in adult institutions and peer culture describes crowds. Peer groups tend to influence adolescents’ behavior. Peers tend to be people who are just like you Ex. 1. Children in your class 2. Children your age 3. Children in your year level 4. Friends outside of school 5. Children in groups you belong too - Peer group pressure often influences the way you dress, behave, think, live your life now, the way you might live in the future, and the kind of adult who you become.

Developmental psychology
Many psychologists such as Vygotsky came up with theories that relate to peers. He came up with the theory of Zone of Proximal development, which is defined as the gap between what a student can do alone and what the student can achieve through teacher assistance. The values and attitudes of the peer group are essential elements in learning. Those who surround themselves with academically focused peers will be more likely to internalize this type of behavior. In addition Piaget identified with aspects of development, occurring from middle childhood onwards, for which peer groups are essential. He suggested that children’s speech to peers is less egocentric than their speech to adults. Egocentric speech is referring to the speech that is not adapted to what the listener just said. Erikson went on to describe how peer pressure is a key event during the adolescences stage of psychosocial development. In his Latency stage, which includes children from 6-12 years old and this is when the adolescents begin to develop relationships among their peers. Finally, Sullivan described friendships as providing the following functions: (a) offering consensual validation, (b) bolstering feelings of self-worth, (c) providing affection and a context for intimate disclosure, (d) promoting interpersonal sensitivity, and (e) setting the foundation for romantic and parental relationships. Sullivan believed these functions developed during childhood and that true friendships were formed around the age of 9 or 10.

Peer pressure
Although peer pressure is not isolated to one age group, it is usually most common during the adolescent stage. Adolescence is a period characterized by experimentation, and adolescents typically spend a lot of time with their peers in social contexts. Teenagers compel each other to go along with certain beliefs or behaviors, and studies have shown that boys are more likely to give in to it than girls. There has been much research done to gain a better understanding about the effects of peer pressure, and this research will allow parents to handle and understand their children’s behaviors and obstacles they will face due to their peer groups. Learning how peer pressure impacts individuals is a step to minimizing the negative effects it leads to.

Risk Behaviors
Several studies have shown that peer groups are powerful agents of risk behaviors in adolescence. Adolescents typically replace family with peers regarding social and leisure activities, and many problematic behaviors occur in the context of these groups. A study done in 2012 focused on adolescents’ engagement in risk behaviors. Participants completed a self-report measure of identity commitment, which explores values, beliefs, and aspirations, as well as a self-report that measures perceived peer group pressure and control. Both peer group pressure and control were positively related to risky behaviors. However, adolescents who were more committed to a personal identity had lower rates of risk behaviors. Overall, this study shows us that adolescent identity development may help prevent negative effects of peer pressure in high-risk adolescents.

Aggression and Prosocial Behavior
Social behaviors can be promoted or discouraged by social groups, and several studies have shown that aggression and prosociality are susceptible to peer influence. A longitudinal study done in 2011 focused on these two behaviors. A sample of adolescents was followed over a one-year period, and results showed that adolescents who joined an aggressive group were more likely to increase their aggression levels. Also, adolescents were likely to display prosocial behaviors that were similar to the consistent behaviors of the group they were in. An adolescent's peer group plays a role in shaping him or her into an adult, and the lack of positive behavior can lead to consequences in the future.

Sexual Promiscuity
Adolescence is also characterized by physical changes, new emotions, and sexual urges, and teenagers are likely to participate in sexual activity. A longitudinal study done in 2012 followed a group of adolescents for thirteen years. Self-reports, peer nominations, teacher ratings, counselor ratings, and parent reports were collected, and results showed a strong correlation between deviant peer groups and sexual promiscuity. Many teens claimed that the reasons for having sex at a young age include peer pressure or pressure from their partner. The effects of sexual activity at a young age are of great concern. Pregnancy and sexually transmitted diseases are only a few of the consequences that can occur.