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9.4 Group Influences on Behavior and Mental Processes

4 min readdecember 27, 2022

Sumi Vora

Sumi Vora

Sumi Vora

Sumi Vora

Attend a live cram event

Review all units live with expert teachers & students

Group Dynamics 

When we are in a group, we tend to feel less accountable for our actions and worry less about what others think. This often leads to : we tend to put less effort into tasks when we are in a group compared to when we are working alone.

You probably see this all of the time!

https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2F-CDHYzIfuC3xX.jpg?alt=media&token=cc6272db-8a9a-4245-ba7e-69657fedfe1f

Image Courtesy of Research Leap.

Additionally, group opinions are amplified, which is known as the . This is more of an economics concept, so you don't have to be too familiar with it.

Individual Behavior in Groups 

Social Facilitation

is an individual’s improved performance on easy or well-learned tasks when they are with others. When others observe us, we become aroused, which solicits the most likely response to a stimulus. This means that we will perform better on easy tasks, but worse on difficult tasks. The tendency to perform worse on difficult tasks is called

Group Polarization

is where a group will move farther and farther toward their individual ideas over time, as the group discusses their beliefs with like-minded people. While this phenomenon tends to bring groups closer together, it also facilitates unrealistic thinking and hatred between groups. is very apparent when we look at modern-day political dynamics. 

can intensify group biases. is the tendency to favor our own group (the ingroup) rather than others (the outgroup). This “us vs. them” phenomenon kept us safe when we evolved, but today it is the basis of prejudice and discrimination. 

occurs when individuals lose their self-awareness and self-restraint in group situations 🎭 Similar to , people in groups tend to take less responsibility for their actions, which can lead people to be less inhibited when they are in a group. This is a big cause of internet trolling and cyberbullying. 

https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2F-ULvAko5UQWcj.jpg?alt=media&token=7a34f7a5-43ba-4f4e-b76e-60640e974c21

Image Courtesy of iResearchNet.

Helping Others 

Most people will act similarly when it comes to helping people: we will only act if

a) we can see the problem, 👀

b) we interpret it as an emergency, and 🚨

c) we feel responsible for helping. 🤝

The is the idea that people are less likely to help if others are around, because we assume that someone else will help instead. This can lead to unfortunate outcomes, where several people have witnessed assaults with no one calling the police or getting help. This was amplified in 1964 during the tragic murder of Kitty Genovese outside a New York apartment. It was reported that 38 people witnessed the murder, yet they didn't do anything because they thought someone else would do the helping instead 😢.

The is the expectation that if I help you, you will help me. This is part of a process called , which upholds that our behavior toward others is based on weighing the costs and benefits of our actions. 

Sometimes, however, we fall into , which cause us to harm the well-being of society for our own interests.

One social trap that you may have heard about is called the . Imagine that Prisoner A and Prisoner B are both charged with the same crime, and both have to give a testimony. If only one prisoner is testified against, then they will serve three years and the other will be set free. If both prisoners testify against each other, they will both receive 2 years in jail. And, if both confess or neither testify, then they will both receive one year in jail. They are detained separately, so neither prisoner knows what the other person will say.

https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2F-p2yFHjY9I74z.jpg?alt=media&token=dccd9769-0d72-4336-988f-a4fab246dc70

Image Courtesy of Britannica.

If you look at the dilemma logically, then you know that option C, both prisoners giving a confession, is the best option. However, if you just look at it from Prisoner A’s perspective, not testifying against Prisoner B could either lead to 1 or 3 years in jail. Testifying, on the other hand, could lead to either 0 or 2 years in jail. So, if we assume that Prisoner A is self-interested, then testifying would probably be the better option. The shows a social trap—where the prisoners have to weigh their own self interest with the benefit of the collective. 

Conflict Resolution 

A conflict is a disagreement of actions, goals, or ideas. Conflicting people tend to engage in , where they view the other as hostile or evil and view themselves as good and peaceful. This links back to the , where we tend to attribute others’ actions as inherently bad, but our own actions as the result of provocation from the other side. 

When resolving conflicts, it helps to identify : goals that both parties want to achieve and that require cooperation 🥅 transcend group boundaries, and may help to form new, more inclusive groups. Additionally, when contact is noncompetitive and parties are of equal status, putting the two conflicting parties in close contact helps them accept one another more.

🎥Watch: AP PsychologyBystanders, Groups, and Deindividuation

Key Terms to Review (18)

Bystander Effect

: The bystander effect is a social psychological phenomenon where individuals are less likely to offer help to a victim when other people are present.

Conflict Resolution

: Conflict resolution involves the process of resolving a dispute or a conflict by providing each side's needs and adequately addressing their interests so that they are satisfied with the outcome.

Crowding Effect

: The crowding effect refers to decreased performance or discomfort caused by perceived high density or number of people within an environment.

Deindividuation

: Deindividuation is losing self-awareness and self-restraint occurring in situations that foster arousal and anonymity.

Fundamental Attribution Error

: Fundamental attribution error is the tendency for people to overemphasize dispositional attributes for others' behavior while underestimating situational influences.

Group Dynamics

: Group dynamics refers to the behavioral and psychological processes that occur within a social group, or between social groups. It involves how individuals form, change, disband groups and how these groups function.

Group Polarization

: Group polarization refers to the tendency for a group to make decisions that are more extreme than the initial inclination of its members.

Individual Behavior in Groups

: This refers to the way an individual acts within a group setting. It's influenced by social norms, roles, and expectations.

Ingroup Bias

: Ingroup bias is favoring one's own group over other groups.

Mirror-Image Perceptions

: This is a psychological concept where each party involved in a conflict views themselves as ethical and peaceful, while viewing the opposing party as evil and aggressive.

Prisoner’s Dilemma

: The prisoner's dilemma refers to a hypothetical scenario where two individuals are arrested and charged with a crime. They have the option either to betray each other for their own benefit or remain silent. The dilemma arises from understanding that while each individual benefits from mutual cooperation, it’s tempting and potentially more beneficial individually to betray the other.

Reciprocity Norm

: The reciprocity norm is a social expectation that we should return help to those who have helped us.

Social Exchange Theory

: Social exchange theory suggests that our relationships and interactions with others are based on an analysis of costs (negative outcomes) and benefits (positive outcomes).

Social Facilitation

: This is the tendency for people to perform better on tasks in the presence of others than when alone.

Social Inhibition

: This refers to the tendency for individuals to perform worse or become less likely to act out in front of others compared to when they are alone.

Social Loafing

: Social loafing refers to the phenomenon where individuals exert less effort when working on a task in a group compared to when they work alone.

Social Traps

: Social traps refer to situations in which individuals or groups pursue immediate benefits that later result in negative consequences for the group as a whole.

Superordinate Goals

: These are shared goals that override differences among people and require their cooperation.

9.4 Group Influences on Behavior and Mental Processes

4 min readdecember 27, 2022

Sumi Vora

Sumi Vora

Sumi Vora

Sumi Vora

Attend a live cram event

Review all units live with expert teachers & students

Group Dynamics 

When we are in a group, we tend to feel less accountable for our actions and worry less about what others think. This often leads to : we tend to put less effort into tasks when we are in a group compared to when we are working alone.

You probably see this all of the time!

https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2F-CDHYzIfuC3xX.jpg?alt=media&token=cc6272db-8a9a-4245-ba7e-69657fedfe1f

Image Courtesy of Research Leap.

Additionally, group opinions are amplified, which is known as the . This is more of an economics concept, so you don't have to be too familiar with it.

Individual Behavior in Groups 

Social Facilitation

is an individual’s improved performance on easy or well-learned tasks when they are with others. When others observe us, we become aroused, which solicits the most likely response to a stimulus. This means that we will perform better on easy tasks, but worse on difficult tasks. The tendency to perform worse on difficult tasks is called

Group Polarization

is where a group will move farther and farther toward their individual ideas over time, as the group discusses their beliefs with like-minded people. While this phenomenon tends to bring groups closer together, it also facilitates unrealistic thinking and hatred between groups. is very apparent when we look at modern-day political dynamics. 

can intensify group biases. is the tendency to favor our own group (the ingroup) rather than others (the outgroup). This “us vs. them” phenomenon kept us safe when we evolved, but today it is the basis of prejudice and discrimination. 

occurs when individuals lose their self-awareness and self-restraint in group situations 🎭 Similar to , people in groups tend to take less responsibility for their actions, which can lead people to be less inhibited when they are in a group. This is a big cause of internet trolling and cyberbullying. 

https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2F-ULvAko5UQWcj.jpg?alt=media&token=7a34f7a5-43ba-4f4e-b76e-60640e974c21

Image Courtesy of iResearchNet.

Helping Others 

Most people will act similarly when it comes to helping people: we will only act if

a) we can see the problem, 👀

b) we interpret it as an emergency, and 🚨

c) we feel responsible for helping. 🤝

The is the idea that people are less likely to help if others are around, because we assume that someone else will help instead. This can lead to unfortunate outcomes, where several people have witnessed assaults with no one calling the police or getting help. This was amplified in 1964 during the tragic murder of Kitty Genovese outside a New York apartment. It was reported that 38 people witnessed the murder, yet they didn't do anything because they thought someone else would do the helping instead 😢.

The is the expectation that if I help you, you will help me. This is part of a process called , which upholds that our behavior toward others is based on weighing the costs and benefits of our actions. 

Sometimes, however, we fall into , which cause us to harm the well-being of society for our own interests.

One social trap that you may have heard about is called the . Imagine that Prisoner A and Prisoner B are both charged with the same crime, and both have to give a testimony. If only one prisoner is testified against, then they will serve three years and the other will be set free. If both prisoners testify against each other, they will both receive 2 years in jail. And, if both confess or neither testify, then they will both receive one year in jail. They are detained separately, so neither prisoner knows what the other person will say.

https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2F-p2yFHjY9I74z.jpg?alt=media&token=dccd9769-0d72-4336-988f-a4fab246dc70

Image Courtesy of Britannica.

If you look at the dilemma logically, then you know that option C, both prisoners giving a confession, is the best option. However, if you just look at it from Prisoner A’s perspective, not testifying against Prisoner B could either lead to 1 or 3 years in jail. Testifying, on the other hand, could lead to either 0 or 2 years in jail. So, if we assume that Prisoner A is self-interested, then testifying would probably be the better option. The shows a social trap—where the prisoners have to weigh their own self interest with the benefit of the collective. 

Conflict Resolution 

A conflict is a disagreement of actions, goals, or ideas. Conflicting people tend to engage in , where they view the other as hostile or evil and view themselves as good and peaceful. This links back to the , where we tend to attribute others’ actions as inherently bad, but our own actions as the result of provocation from the other side. 

When resolving conflicts, it helps to identify : goals that both parties want to achieve and that require cooperation 🥅 transcend group boundaries, and may help to form new, more inclusive groups. Additionally, when contact is noncompetitive and parties are of equal status, putting the two conflicting parties in close contact helps them accept one another more.

🎥Watch: AP PsychologyBystanders, Groups, and Deindividuation

Key Terms to Review (18)

Bystander Effect

: The bystander effect is a social psychological phenomenon where individuals are less likely to offer help to a victim when other people are present.

Conflict Resolution

: Conflict resolution involves the process of resolving a dispute or a conflict by providing each side's needs and adequately addressing their interests so that they are satisfied with the outcome.

Crowding Effect

: The crowding effect refers to decreased performance or discomfort caused by perceived high density or number of people within an environment.

Deindividuation

: Deindividuation is losing self-awareness and self-restraint occurring in situations that foster arousal and anonymity.

Fundamental Attribution Error

: Fundamental attribution error is the tendency for people to overemphasize dispositional attributes for others' behavior while underestimating situational influences.

Group Dynamics

: Group dynamics refers to the behavioral and psychological processes that occur within a social group, or between social groups. It involves how individuals form, change, disband groups and how these groups function.

Group Polarization

: Group polarization refers to the tendency for a group to make decisions that are more extreme than the initial inclination of its members.

Individual Behavior in Groups

: This refers to the way an individual acts within a group setting. It's influenced by social norms, roles, and expectations.

Ingroup Bias

: Ingroup bias is favoring one's own group over other groups.

Mirror-Image Perceptions

: This is a psychological concept where each party involved in a conflict views themselves as ethical and peaceful, while viewing the opposing party as evil and aggressive.

Prisoner’s Dilemma

: The prisoner's dilemma refers to a hypothetical scenario where two individuals are arrested and charged with a crime. They have the option either to betray each other for their own benefit or remain silent. The dilemma arises from understanding that while each individual benefits from mutual cooperation, it’s tempting and potentially more beneficial individually to betray the other.

Reciprocity Norm

: The reciprocity norm is a social expectation that we should return help to those who have helped us.

Social Exchange Theory

: Social exchange theory suggests that our relationships and interactions with others are based on an analysis of costs (negative outcomes) and benefits (positive outcomes).

Social Facilitation

: This is the tendency for people to perform better on tasks in the presence of others than when alone.

Social Inhibition

: This refers to the tendency for individuals to perform worse or become less likely to act out in front of others compared to when they are alone.

Social Loafing

: Social loafing refers to the phenomenon where individuals exert less effort when working on a task in a group compared to when they work alone.

Social Traps

: Social traps refer to situations in which individuals or groups pursue immediate benefits that later result in negative consequences for the group as a whole.

Superordinate Goals

: These are shared goals that override differences among people and require their cooperation.


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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.


© 2024 Fiveable Inc. All rights reserved.

AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.