Bystander Effect and Diffusion of Responsibility (2023)

Take-home Messages

  • The bystander effect, or bystander apathy, is a social psychological theory that states that an individual’s likelihood of helping decreases when passive bystanders are present in an emergency situation.
  • The most frequently cited real-life example of the bystander effect regards a young woman called Kitty Genovese, who was murdered in Queens, New York, in 1964 while several of her neighbors looked on. No one intervened until it was too late.
  • Latané and Darley (1970) proposed a five-step decision model of helping, during each of which bystanders can decide to do nothing:
    1. Notice the event (or in a hurry and not notice).
    2. Interpret the situation as an emergency (or assume that as others are not acting, it is not an emergency).
    3. Assume responsibility (or assume that others will do this).
    4. Know what to do (or not have the skills necessary to help).
    5. Decide to help (or worry about danger, legislation, embarrassment, etc.).
  • Latané and Darley (1970) identified three different psychological processes that might prevent a bystander from helping a person in distress: (i) diffusion of responsibility; (ii) evaluation apprehension (fear of being publically judged); and (iii) pluralistic ignorance (the tendency to rely on the overt reactions of others when defining an ambiguous situation).
  • Diffusion of responsibility refers to the tendency to subjectively divide personal responsibility to help by the number of bystanders present. Bystanders are less likely to intervene in emergency situations as the size of the group increases, and they feel less personal responsibility.

In This Article

What is the bystander effect?

The term bystander effect refers to the tendency for people to be inactive in high-danger situations due to the presence of other bystanders (Darley & Latané, 1968; Latané & Darley, 1968, 1970; Latané & Nida, 1981).

Thus, people tend to help more when alone than in a group.

The implications of this theory have been widely studied by a variety of researchers, but initial interest in this phenomenon arose after the brutal murder of Catherine “Kitty” Genovese in 1964.

Through a series of experiments beginning in the 1960s and 1970s, the bystander effect phenomenon has become more widely understood.

Kitty Genovese

On the morning of March 13, 1964, Kitty Genovese returned to her apartment complex, at 3 am, after finishing her shift at a local bar.

After parking her car in a lot adjacent to her apartment building, she began walking a short distance to the entrance, which was located at the back of the building.

As she walked, she noticed a figure at the far end of the lot. She shifted directions and headed towards a different street, but the man followed and seized her.

As she yelled, neighbors from the apartment building went to the window and watched as he stabbed her. A man from the apartment building yelled down, “Let that girl alone!” (New York Times, 1964).

Following this, the assailant appeared to have left, but once the lights from the apartments turned off, the perpetrator returned and stabbed Kitty Genovese again. Once again, the lights came on, and the windows opened, driving the assaulter away from the scene.

Unfortunately, the assailant returned and stabbed Catherine Genovese for the final time. The first call to the police came in at 3:50 am, and the police arrived in two minutes.

When the neighbors were asked why they did not intervene or call the police earlier, some answers were “I didn”t want to get involved”; “Frankly, we were afraid”; “I was tired. I went back to bed.” (New York Times, 1964).

After this initial report, the case was launched to nationwide attention, with various leaders commenting on the apparent “moral decay” of the country.

In response to these claims, Darley and Latané set out to find an alternative explanation.

Decision Model of Helping

Latané & Darley (1970) formulated a five-stage model to explain why bystanders in emergencies sometimes do and sometimes do not offer help.

At each stage in the model, the answer ‘No’ results in no help being given, while the answer ‘yes’ leads the individual closer to offering help.

However, they argued that helping responses may be inhibited at any stage of the process. For example, the bystander may not notice the situation or the situation may be ambiguous and not readily interpretable as an emergency.

The five stages are:

  1. The bystander must notice that something is amiss.
  2. The bystander must define that situation as an emergency.
  3. The bystander must assess how personally responsible they feel.
  4. The bystander must decide how best to offer assistance.
  5. The bystander must act on that decision.

Bystander Effect and Diffusion of Responsibility (1)


Figure 1. Decision Model of Helping by Latané and Darley (1970).

Why does the bystander effect occur?

Latane´ and Darley (1970) identified three different psychological processes that might interfere with the completion of this sequence.

Diffusion of Responsibility

The first process is a diffusion of responsibility, which refers to the tendency to subjectively divide the personal responsibility to help by the number of bystanders.

Diffusion of responsibility occurs when a duty or task is shared between a group of people instead of only one person.

Whenever there is an emergency situation in which more than one person is present, there is a diffusion of responsibility. There are three ideas that categorize this phenomenon:

  1. The moral obligation to help does not fall only on one person but the whole group that is witnessing the emergency.
  2. The blame for not helping can be shared instead of resting on only one person.
  3. The belief that another bystander in the group will offer help.

Darley and Latané (1968) tested this hypothesis by engineering an emergency situation and measuring how long it took for participants to get help.

College students were ushered into a solitary room under the impression that a conversation centered around learning in a “high-stress, high urban environment” would ensue.

This discussion occurred with “other participants” that were in their own room as well (the other participants were just records playing). Each participant would speak one at a time into a microphone.

After a round of discussion, one of the participants would have a “seizure” in the middle of the discussion; the amount of time that it took the college student to obtain help from the research assistant that was outside of the room was measured. If the student did not get help after six minutes, the experiment was cut off.

Darley and Latané (1968) believed that the more “people” there were in the discussion, the longer it would take subjects to get help.

The results were in line with that hypothesis. The smaller the group, the more likely the “victim” was to receive timely help.

Still, those who did not get help showed signs of nervousness and concern for the victim. The researchers believed that the signs of nervousness highlight that the college student participants were most likely still deciding the best course of action; this contrasts with the leaders of the time who believed inaction was due to indifference.

This experiment showcased the effect of diffusion of responsibility on the bystander effect.

Evaluation Apprehension

The second process is evaluation apprehension, which refers to the fear of being judged by others when acting publicly.

People may also experience evaluation apprehension and fear of losing face in front of other bystanders.

Individuals may feel afraid of being superseded by a superior helper, offering unwanted assistance, or facing the legal consequences of offering inferior and possibly dangerous assistance.

Individuals may decide not to intervene in critical situations if they are afraid of being superseded by a superior helper, offering unwanted assistance, or facing the legal consequences of offering inferior and possibly dangerous assistance.

Pluralistic Ignorance

The third process is pluralistic ignorance, which results from the tendency to rely on the overt reactions of others when defining an ambiguous situation.

Pluralistic ignorance occurs when a person disagrees with a certain type of thinking but believes that everyone else adheres to it and, as a result, follows that line of thinking even though no one believes it.

Deborah A. Prentice cites an example of this. Despite being in a difficult class, students may not raise their hands in response to the lecturer asking for questions.

This is often due to the belief that everyone else understands the material, so for fear of looking inadequate, no one asks clarifying questions.

It is this type of thinking that explains the effect of pluralistic ignorance on the bystander effect. The overarching idea is uncertainty and perception. What separates pluralistic ignorance is the ambiguousness that can define a situation.

If the situation is clear (for the classroom example: someone stating they do not understand), pluralistic ignorance would not apply (since the person knows that someone else agrees with their thinking).

It is the ambiguity and uncertainty which leads to incorrect perceptions that categorize pluralistic ignorance.

Rendsvig (2014) proposes an eleven-step process to explain this phenomenon.

These steps follow the perspective of a bystander (who will be called Bystander A) amidst a group of other bystanders in an emergency situation.

  1. Bystander A is present in a specific place. Nothing has happened.
  2. A situation occurs that is ambiguous in nature (it is not certain what has occurred or what the ramifications of the event are), and Bystander A notices it.
  3. Bystander A believes that this is an emergency situation but is unaware of how the rest of the bystanders perceive the situation.
  4. A course of action is taken. This could be a few things like charging into the situation or calling the police, but in pluralistic ignorance, Bystander A chooses to understand more about the situation by looking around and taking in the reactions of others.
  5. As observation takes place, Bystander A is not aware that the other bystanders may be doing the same thing. Thus, when surveying others’ reactions, Bystander A “misperceives” the other bystanders” observation of the situation as purposeful inaction.
  6. As Bystander A notes the reaction of the others, Bystander A puts the reaction of the other bystanders in context.
  7. Bystander A then believes that the inaction of others is due to their belief that an emergency situation is not occurring.
  8. Thus, Bystander A believes that there is an accident but also believes that others do not perceive the situation as an emergency. Bystander A then changes their initial belief.
  9. Bystander A now believes that there is no emergency.
  10. Bystander A has another opportunity to help.
  11. Bystander A chooses not to help because of the belief that there is no emergency.

Pluralistic ignorance operates under the assumption that all the other bystanders are also going through these eleven steps.

Thus, they all choose not to help due to the misperception of others’ reactions to the same situation.

(Video) The Bystander Effect (Examples + Experiments)

Other Explanations

While these three are the most widely known explanations, there are other theories that could also play a role. One example is a confusion of responsibility.

Confusion of responsibility occurs when a bystander fears that helping could lead others to believe that they are the perpetrator. This fear can cause people to not act in dire situations.

Another example is priming. Priming occurs when a person is given cues that will influence future actions. For example, if a person is given a list of words that are associated with home decor and furniture and then is asked to give a five-letter word, answers like chair or table would be more likely than pasta.

In social situations, Garcia et al. found that simply thinking of being in a group could lead to lower rates of helping in emergency situations. This occurs because groups are often associated with “being lost in a crowd, being deindividuated, and having a lowered sense of personal accountability” (Garcia et al., 2002, p. 845).

Thus, the authors argue that the way a person was primed could also influence their ability to help. These alternate theories highlight the fact that the bystander effect is a complex phenomenon that encompasses a variety of ideologies.

Bystander Experiments

In one of the first experiments of this type, Latané & Darley (1968) asked participants to sit on their own in a room and complete a questionnaire on the pressures of urban life.

Smoke (actually steam) began pouring into the room through a small wall vent. Within two minutes, 50 percent had taken action, and 75 percent had acted within six minutes when the experiment ended.

In groups of three participants, 62 percent carried on working for the entire duration of the experiment.

In interviews afterward, participants reported feeling hesitant about showing anxiety, so they looked to others for signs of anxiety. But since everyone was trying to appear calm, these signs were not evident, and therefore they believed that they must have misinterpreted the situation and redefined it as ‘safe.’

This is a clear example of pluralistic ignorance, which can affect the answer at step 2 of the Latané and Darley decision model above.

(Video) The Bystander Effect: Why Some People Act and Others Don't | Kelly Charles-Collins | TEDxOcala

Genuine ambiguity can also affect the decision-making process. Shotland and Straw (1976) conducted an interesting experiment that illustrated this.

They hypothesized that people would be less willing to intervene in a situation of domestic violence (where a relationship exists between the two people) than in a situation involving violence involving two strangers. Male participants were shown a staged fight between a man and a woman.

In one condition, the woman screamed, ‘I don’t even know you,’ while in another, she screamed, ‘I don’t even know why I married you.’

Three times as many men intervened in the first condition as in the second condition. Such findings again provide support for the decision model in terms of the decisions made at step 3 in the process.

People are less likely to intervene if they believe that the incident does not require their personal responsibility.

Critical Evaluation

While the bystander effect has become a cemented theory in social psychology, the original account of the murder of Catherine Genovese has been called into question. By casting doubt on the original case, the implications of the Darley and Latané research are also questioned.

Manning et al. (2007) did this through their article “The Kitty Genovese murder and the social psychology of helping, The parable of the 38 witnesses”. By examining the court documents and legal proceedings from the case, the authors found three points that deviate from the traditional story told.

While it was originally claimed that thirty-eight people witnessed this crime, in actuality, only a few people physically saw Kitty Genovese and her attacker; the others just heard the screams from Kitty Genovese.

In addition, of those who could see, none actually witnessed the stabbing take place (although one of the people who testified did see a violent action on behalf of the attacker.)

This contrasts with the widely held notion that all 38 people witnessed the initial stabbing.

Lastly, the second stabbing that resulted in the death of Catherine Genovese occurred in a stairwell which was not in the view of most of the initial witnesses; this deviates from the original article that stated that the murder took place on Austin Street in New York City in full view of at least 38 people.

This means that they would not have been able to physically see the murder take place. The potential inaccurate reporting of the initial case has not negated the bystander effect completely, but it has called into question its applicability and the incomplete nature of research concerning it.

Limitations of the Decision-Helping Model

Schroeder et al. (1995) believe that the decision-helping model provides a valuable framework for understanding bystander intervention.

Although primarily developed to explain emergency situations, it has been applied to other situations, such as preventing someone from drinking and driving, to deciding to donate a kidney to a relative.

However, the decision model does not provide a complete picture. It fails to explain why ‘no’ decisions are made at each stage of the decision tree. This is particularly true after people have originally interpreted the event as an emergency.

The decision model doesn’t take into account emotional factors such as anxiety or fear, nor does it focus on why people do help; it mainly concentrates on why people don’t help.

Piliavin et al. (1969, 1981) put forward the cost–reward arousal model as a major alternative to the decision model and involves evaluating the consequences of helping or not helping.

Whether one helps or not depends on the outcome of weighing up both the costs and rewards of helping. The costs of helping include effort, time, loss of resources, risk of harm, and negative emotional response.

The rewards of helping include fame, gratitude from the victim and relatives, and self-satisfaction derived from the act of helping. It is recognized that costs may be different for different people and may even differ from one occasion to another for the same person.

Accountability Cues

According to Bommel et al. (2012), the negative account of the consequences of the bystander effect undermines the potential positives. The article “Be aware to care: Public self-awareness leads to a reversal of the bystander effect” details how crowds can actually increase the amount of aid given to a victim under certain circumstances.

One of the problems with bystanders in emergency situations is the ability to split the responsibility (diffusion of responsibility).

Yet, when there are “accountability cues,” people tend to help more. Accountability cues are specific markers that let the bystander know that their actions are being watched or highlighted, like a camera. In a series of experiments, the researchers tested if the bystander effect could be reversed using these cues.

An online forum that was centered around aiding those with “severe emotional distress” (Bommel et al., 2012) was created.

The participants in the study responded to specific messages from visitors of the forum and then rated how visible they felt on the forum.

(Video) Bystander effect | Behavior | MCAT | Khan Academy

The researchers postulated that when there were no accountability cues, people would not give as much help and would not rate themselves as being very visible on the forum; when there are accountability cues (using a webcam and highlighting the name of the forum visitor), not only would more people help but they would also rate themselves as having a higher presence on the forum.

As expected, the results fell in line with these theories. Thus, targeting one’s reputation through accountability cues could increase the likelihood of helping. This shows that there are potential positives to the bystander effect.

Neuroimaging Evidence

Researchers looked at the regions of the brain that were active when a participant witnessed emergencies. They noticed that less activity occurred in the regions that facilitate helping: the pre- and postcentral gyrus and the medial prefrontal cortex (Hortensius et al., 2018).

Thus, one’s initial biological response to an emergency situation is inaction due to personal fear. After that initial fear, sympathy arises, which prompts someone to go to the aid of the victim. These two systems work in opposition; whichever overrides the other determines the action that will be taken.

If there is more sympathy than personal distress, the participant will help. Thus, these researchers argue that the decision to help is not “reflective” but “reflexive” (Hortensius et al., 2018).

With this in mind, the researchers argue for a more personalized view that takes into account one’s personality and disposition to be more sympathetic rather than utilize a one-size-fits-all overgeneralization.


Darley, J. M., & Latané´, B. (1968). Bystander intervention in emergencies: Diffusion of responsibility. Journal of Personality and Social Psychology, 8, 377–383.

Garcia, Stephen M, Weaver, Kim, Moskowitz, Gordon B, & Darley, John M. (2002). Crowded Minds. Journal of Personality and Social Psychology, 83 (4), 843-853.

Hortensius, Ruud, & De Gelder, Beatrice. (2018). From Empathy to Apathy: The Bystander Effect Revisited. Current Directions in Psychological Science, 27 (4), 249-256.

Latané´, B., & Darley, J. M. (1968). Group inhibition of bystander intervention in emergencies. Journal of Personality and Social Psychology, 10, 215–221.

Latané´, B., & Darley, J. M. (1970). The unresponsive bystander: Why doesn’t he help? New York, NY: Appleton-Century-Croft.

Latané´, B., & Darley, J. M. (1976). Help in a crisis: Bystander response to an emergency . Morristown, NJ: General Learning Press.

Latané´, B., & Nida, S. (1981). Ten years of research on group size and helping. Psychological Bulletin, 89, 308 –324.

Manning, R., Levine, M., & Collins, A. (2007). The Kitty Genovese murder and the social psychology of helping: The parable of the 38 witnesses. American Psychologist, 62, 555-562.

Prentice, D. (2007). Pluralistic ignorance. In R. F. Baumeister & K. D. Vohs (Eds.), Encyclopedia of social psychology (Vol. 1, pp. 674-674). Thousand Oaks, CA: SAGE Publications, Inc.

Rendsvig, R. K. (2014). Pluralistic ignorance in the bystander effect: Informational dynamics of unresponsive witnesses in situations calling for intervention. Synthese (Dordrecht), 191 (11), 2471-2498.

Shotland, R. L., & Straw, M. K. (1976). Bystander response to an assault: When a man attacks a woman. Journal of Personality and Social Psychology, 34 (5), 990.

Siegal, H. A. (1972). The Unresponsive Bystander: Why Doesn’t He Help? 1(3), 226-227.

Van Bommel, Marco, Van Prooijen, Jan-Willem, Elffers, Henk, & Van Lange, Paul A.M. (2012). Be aware to care: Public self-awareness leads to a reversal of the bystander effect. Journal of Experimental Social Psychology, 48 (4), 926-930.


Bystander Effect and Diffusion of Responsibility? ›

Diffusion of responsibility refers to the fact that as the number of bystanders increases, the personal responsibility that an individual bystander feels decreases. As a consequence, so does his or her tendency to help.

What is an example of diffusion of responsibility? ›

An example of diffusion of responsibility in the workplace is witnessing racist, sexist, or otherwise inappropriate behavior coming from one employee toward another and not reporting it because you believe it's not your place to speak up.

What is an example of bystander effect? ›

For example, when other people act calmly in the presence of a potential emergency because they are unsure of what the event means, bystanders may not interpret the situation as an emergency and thus act as if nothing is wrong.

What is the explanation of the bystander effect? ›

The bystander effect occurs when the presence of others discourages an individual from intervening in an emergency situation, against a bully, or during an assault or other crime. The greater the number of bystanders, the less likely it is for any one of them to provide help to a person in distress.

What is a famous case of diffusion of responsibility? ›

A real-life example of diffusion of responsibility and the bystander effect. One of the most famous examples of how the bystander effect has played out is with the murder of Kitty Genovese. Kitty was returning home from work at 2:30 a.m. on March 13, 1964, when she was grabbed by a man with a knife and stabbed.

What is diffusion of responsibility in everyday life? ›

Diffusion of responsibility also known as the bystander effect, occurs in emergencies, where a lot of people have gathered around. Diffusion of responsibility is where the feeling of personal responsibility diminishes in a bystander when the number of bystanders increases.

What are the two types of bystander effect? ›

Latané and Darley attributed the bystander effect to two factors: diffusion of responsibility and social influence. The perceived diffusion of responsibility means that the more onlookers there are, the less personal responsibility individuals will feel to take action.

What is the bystander effect examples for students? ›

Take action when you see wrongdoing. Report things before waiting for someone else to report them. Assign someone to call 911 so they know it is their responsibility. You just might save someone's grade in your college class – or someone's life.

What are the 5 factors of bystander effect? ›

Latané and Darley (1970) describe a five-step process during bystander situations: The potential emergency (a) captures the attention of the individual, who (b) evaluates the emergency, (c) decides on responsibility and (d) belief of competence, and then ultimately (e) makes the decision to help or not.

What is diffusion of responsibility in social psychology? ›

Diffusion of responsibility occurs when people who need to make a decision wait for someone else to act instead. The more people involved, the more likely it is that each person will do nothing, believing someone else from the group will probably respond.

How do you overcome the bystander effect? ›

Here are tips on how to overcome the pull of the bystander effect:
  1. If you're in trouble, pick out one person in the crowd. ...
  2. If you're a bystander, take action. ...
  3. Take advantage of our natural tendencies toward altruism. ...
  4. Try not to worry about the consequences of helping. ...
  5. Model altruism and helping to the young.
Sep 28, 2010

Do bystanders have a responsibility to intervene? ›

Breadcrumb. Everyone has a duty and a responsibility to intervene if they see harm occurring or about to occur. Bystanders are anyone in the community that sees or hears about a behavior that could lead to something harmful. Through their action, bystanders have the ability to prevent harm from occurring.

What is it called when someone never takes responsibility for their actions? ›

By Darius Cikanavicius on April 18, 2020. A hallmark of people who have strong narcissistic and other dark personality traits (hereafter referred to as narcissists) is the avoidance of taking responsibility for their dysfunctional or incompetent behavior.

What is a famous case of the bystander effect? ›

The Kitty Genovese Case

The most frequently cited example of the bystander effect in introductory psychology textbooks is the brutal murder of a young woman named Catherine "Kitty" ​Genovese. On Friday, March 13, 1964, 28-year-old Genovese was returning home from work.

What are five example of diffusion in everyday life? ›

Opening a Soda bottle and the Carbon dioxide diffuses in the air. Diffusion of tea leaves in water when tea bags are dipped in hot water. Smoke or dust particles diffuse into the air and result in air pollution. Oxygen diffuses in our bloodstream when we inhale.

What is the modern bystander effect? ›

Bibb Latané and John Darley, the psychologists who helped initially define the bystander effect, attributed its cause to one's belief that inaction of others must mean that there isn't an emergency, and therefore placing the responsibility to call for help on the other individuals in the group.

Can the bystander effect ever be positive? ›

The positive bystander effect: passive bystanders increase helping in situations with high expected negative consequences for the helper.

Is the bystander effect an example of social proof? ›

If it is determined that others are not reacting to the situation, bystanders will interpret the situation as not an emergency and will not intervene. This is an example of pluralistic ignorance or social proof.

What are the 3 D's of bystander behavior? ›

What are the 3 Ds? The 3 Ds stands for Direct, Delegate and Distract. These are the three main reactive green dot strategies when intervening in a potential red dot situation.

What are the 4 D's of bystander intervention? ›

How You Can Intervene Safely: When it comes to intervening safely, remember the four Ds – direct, distract, delegate, delay. Call out negative behaviour, tell the person to stop or ask the victim if they are OK.

Which is most likely to reduce the bystander effect? ›

The perceived danger of intervening in a critical situation has the greatest influence in reducing the Bystander Effect. Somewhat counter-intuitively, the more dangerous it is to step in, the more likely individuals are to do so.

How does the diffusion of responsibility affect helping behavior? ›

This is directly caused by the diffusion of responsibility, as it is shown that individuals are much less likely to intervene in a situation when he or she knows others are watching; thus, the responsibility for helping is spread among the group of bystanders, and each bystander does not feel a strong responsibility to ...

What are three barriers to bystander intervention? ›

The three main categories include Personal Obstacles, Peer Influences, and Bystander Dynamics. themselves as an introvert or extrovert, all individuals experience personal obstacles that decrease the likelihood of intervening.

What are steps to combat the bystander effect and diffusion of responsibility? ›

The five stages are:
  • The bystander must notice that something is amiss.
  • The bystander must define that situation as an emergency.
  • The bystander must assess how personally responsible they feel.
  • The bystander must decide how best to offer assistance.
  • The bystander must act on that decision.
Feb 8, 2023

Why do bystanders sometimes fail to help? ›

Bystanders look around and they see other bystanders with no expressions so no one acts. bystander feels they have less responsibility because there are others present who could also respond. The more people at an emergency, the less likely it is that any one person helps.

What is the diffusion of responsibility? ›

Diffusion of responsibility occurs when people who need to make a decision wait for someone else to act instead. The more people involved, the more likely it is that each person will do nothing, believing someone else from the group will probably respond.

What are the 3 examples of diffusion? ›

Some examples of diffusion that occurs in our daily life are given below.
  • The smell of perfumes/Incense Sticks.
  • Opening the Soda/Cold Drinks bottle and the CO2 diffuses in the air.
  • Dipping the tea bags in hot water will diffuse the tea in hot water.
  • Small dust particles or smoke diffuse into the air and cause air pollution.

What is the meaning of diffusion of responsibility? ›

Diffusion of responsibility refers to the fact that as the number of bystanders increases, the personal responsibility that an individual bystander feels decreases.

What are 5 examples of simple diffusion? ›

Example of Simple Diffusion

In the cell, examples of molecules that can use simple diffusion to travel in and out of the cell membrane are water, oxygen, carbon dioxide, ethanol and urea. They pass directly through the cell membrane without energy along the concentration gradient.

What is the bystander effect in group behavior? ›

In short, the bystander effect is the name given to the phenomenon where people in a group fail to offer help to someone during an emergency, even though they are witnesses to the event. In fact, research from 2014 suggests that the bigger the group, the less likely it is that anyone will come to help.

What is the bystander effect in social psychology? ›

The bystander effect is a phenomenon in which a witness or bystander does not volunteer to help a victim or person in distress. Instead, they just watch what is happening. Social psychologists hold that we make these decisions based on the social situation, not our own personality variables.

What is the diffusion of responsibility bystander effect quizlet? ›

What is Diffusion of Responsibility? a person is less likely to take responsibility for an action or inaction when others are present. The responsibility is diffused and put onto others in the group making the individual feel less responsible.

What are two examples of diffusion in humans? ›

Example of diffusion in the human body:
  • Diffusion of oxygen through alveoli in the lungs.
  • A kidney is used to filter out the salts and waste products from our bloodstream.
  • Diffusion of carbon dioxide through alveoli in the lungs.

What is an example of diffusion in social change? ›

An example of cultural diffusion would be the widespread adoption of the use of a cell phone (and often a smartphone) across many different countries and cultures.

What is a real life example of facilitated diffusion? ›

The transport of glucose and amino acid from the bloodstream into the cell is an example of facilitated diffusion. In the small intestine, these molecules are taken in via active transport and then are released into the bloodstream.

What is a life example of simple diffusion? ›

An example of simple diffusion in the body occurs in the lungs. Oxygen molecules flow from high concentration in the lungs, across the semipermeable membrane lining the lungs, and enter the oxygen-deficient blood vessels.

What is simple diffusion for dummies? ›

In simple diffusion, small noncharged molecules or lipid soluble molecules pass between the phospholipids to enter or leave the cell, moving from areas of high concentration to areas of low concentration (they move down their concentration gradient).


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