The unresponsive bystander: are bystanders more responsive in dangerous emergencies?

Previous research in bystander intervention found that the presence of other bystanders reduces helping behaviour in an emergency (bystander effect). This research was mainly conducted in the context of non‐dangerous, non‐violent emergencies. We hypothesize that the classic bystander effect does not occur in more dangerous situations because: a) they are faster and more clearly recognized as emergency situations; and b) higher costs for refusing help increase the accepted costs for helping. Following this line of reasoning, the present research tests whether the bystander effect is affected by the degree of the emergency's potential danger. Results supported our expectations: In situations with low potential danger, more help was given in the solitary condition than in the bystander condition. However, in situations with high potential danger, participants confronted with an emergency alone or in the presence of another bystander were similarly likely to help the victim. Copyright © 2005 John Wiley & Sons, Ltd.     

Social relations and presence of others predict bystander intervention: Evidence from violent incidents captured on CCTV

Are individuals willing to intervene in public violence? Half a century of research on the “bystander effect” suggests that the more bystanders present at an emergency, the less likely each of them is to provide help. However, recent meta-analytical evidence questions whether this effect generalizes to violent emergencies. Besides the number of bystanders present, an alternative line of research suggests that pre-existing social relations between bystanders and conflict participants are important for explaining whether bystanders provide help. The current paper offers a rare comparison of both factors—social relations and the number of bystanders present—as predictors of bystander intervention in real-life violent emergencies. We systematically observed the behavior of 764 bystanders across 81 violent incidents recorded by surveillance cameras in Copenhagen, Denmark. Bystanders were sampled with a case–control design, their behavior was observed and coded, and the probability of intervention was estimated with multilevel regression analyses. The results confirm our predicted association between social relations and intervention. However, rather than the expected reversed bystander effect, we found a classical bystander effect, as bystanders were less likely to intervene with increasing bystander presence. The effect of social relations on intervention was larger in magnitude than the effect of the number of bystanders. We assess these findings in light of recent discussions about the influence of group size and social relations in human helping. Further, we discuss the utility of video data for the assessment of real-life bystander behavior.     

Self‐Categorization and Bystander Non‐intervention: Two Experimental Studies1

This paper outlines a new approach to the study of bystander intervention. Using insights derived from self‐categorization theory (Turner, Hogg, Oakes, Reicher, & Wetherell, 1987), we explore the social category relations among those present in the context of physical violence. The paper describes two experiments that manipulate the social category relations between (a) bystander and fellow bystanders, and (b) bystander and victim. Analysis indicates that fellow bystanders are only influential when they are in‐group rather than out‐group members. Furthermore, bystanders are more likely to help victims who are described as in‐group as opposed to out‐group members. Overall, the findings suggest an important role for a self‐categorization perspective in developing strategies to promote bystander intervention.     

Be aware to care: Public self-awareness leads to a reversal of the bystander effect

The classic bystander effect stipulates that people help others more when they are alone than when other bystanders are present. We reason that, sometimes, the presence of bystanders can increase helping, notably in situations where public self-awareness is increased through the use of accountability cues (e.g., a camera). We conducted two experiments in which we tested this line of reasoning. In both experiments, participants read messages soliciting support in an online forum. We varied the number of people that were present in that forum to create a bystander and an alone condition. In Study 1, we introduced an accountability cue by making participants' screen-names more salient, and in Study 2, we used a webcam. Both studies indicate that, as expected, the bystander effect can be reversed by means of cues that raise public self-awareness in social settings.     

When extraordinary injustice leads to ordinary response: How perpetrator power and size of an injustice event affect bystander efficacy and collective action

Although bystanders can play an integral role in the process of social change, relatively few studies have examined the factors that influence bystander collective action. The present research explores the effect of perpetrator power on bystander efficacy and collective action, as well as the moderating role of impact of the injustice event. Across two experiments, bystanders perceived that collective action would be less effective and were less willing to engage in collective action when a high‐power perpetrator engaged in injustice, compared with a low‐power perpetrator. These effects were moderated by impact of the injustice event, such that the effects of power were especially present under conditions of large impact (many victims), compared with small impact (fewer victims). Whereas the effect of the interaction of perpetrator power and impact on bystander efficacy was explained by perceptions of normativity of the injustice event, the effect of the interaction on bystander collective action was explained by bystander efficacy. Implications for bystander collective action and social change are discussed. Copyright © 2014 John Wiley & Sons, Ltd.     

Helping to overcome intervention inertia in bystander’s dilemmas: Behavioral disinhibition can improve the greater good

Conventional wisdom holds that behavioral disinhibition has negative effects on what humans do. Behavioral disinhibition may indeed frequently have negative effects, but in the present paper we reveal some positive consequences as well: the disinhibition hypothesis proposed here states that people may feel inhibited to intervene in situations in which non-intervening bystanders are present and that, therefore, behavioral disinhibition may help to overcome the bystander effect. Findings presented here provide evidence supporting this prediction both inside and outside the psychology laboratory: in both real-life and controlled bystander situations, people were more likely and faster to provide help when (unrelated to the bystander situations) they had (vs. had not) been reminded about having acted with no inhibitions. These findings suggest that, in contrast with what various theories and worldviews dictate, behavioral disinhibition may have positive effects on helping behavior and hence can be conducive for the greater good.     

Experiences of adolescent witnesses to peer victimization: The bystander effect

Many anti-bullying programs now emphasize the role of bystanders – youth who witness peer victimization. Using a large sample of adolescents (aged 12–18) from the United Kingdom who completed an online survey, the present study examined the types of bystander interventions, their outcomes, and reasons for intervening and not intervening. No significant group differences by any demographic group were found in intervening or not. Results showed that those who had a negative affective reaction when they witnessed bullying were more likely to intervene. Two intervening behaviors (telling the bully to stop and telling an adult) were the strongest predictors of positive results. The most frequently selected reason for not intervening was not knowing what to do, and for intervening, having prosocial and altruistic motives was most common. These and other results are discussed for theoretical and practical implications.     

Emergencies: what are they and do they influence bystanders to intervene?

Social psychological research on helping has, in part, been concerned with the intervention of bystanders into emergencies. Pertinent empirical literature does not seem to be available on what factors bystanders use to define an emergency nor the effect of such a decision on the rate of helping. A series of four studies was conducted to answer these questions. We found that (a) Emergencies are a subclass of problem situation that usually result from accidents; (b) there is a high degree of agreement concerning what problem situations are definitely an emergency; (c) emergency situations are differentiated from other problem situations by threat of harm or actual harm worsening with time, unavailability of an easy solution to the problem, and necessity of obtaining outside help to solve the problem; (d) disagreement on whether a problem situation is an emergency or not results from differing perceptions of the degree to which threat of harm or actual harm worsens with time; (e) bystanders are more likely to help in emergency than in nonemergency problem situations. The results were interpreted as indicating that the need of the victim is a salient feature used by bystanders in determining whether or not to help.     

Call for Research on Bystander Intervention to Prevent Sexual Violence: The Role of Campus Environments

An important next step for the field is to determine what setting‐level factors beyond the individual are critical to fostering campus environments that support pro‐social, helpful bystander intervention action to prevent sexual violence. Therefore, the purpose of this paper is to provide a research agenda to investigate key areas of the campus environment and their potential influence on bystander intervention. To create the research agenda, a number of steps were followed including: (1) systematically reviewing the larger bystander literature to identify key environmental areas, (2) assessing what research is available specific to college campuses and sexual assault in each of these areas, and (3) outlining future research to address each of these areas on college campuses and determine their applicability to sexual violence situations. Five main groups of factors were found to influence bystander intervention beyond the individual, group and situational levels, including: social norms, sense of community, pro‐social modeling, policies, and the physical environment. Certain areas of research on environmental influences on bystander intervention are more developed such as social norms, with little research on areas such as policies and the physical environment. However, further research is needed in each of the identified five areas to help identify how college campuses can support bystander intervention.     

The effect of another bystander's ability to help on bystander intervention in an emergency

Previous research in bystander intervention found that the presence of other bystanders reduced the speed of reporting an emergency. The present research tested the hypothesis that it is not the mere presence of others that reduces speed of helping, but how the others are perceived. Specifically, if another bystander is seen as not being able to help, then there should be no effect on the speed with which the S helps. Subjects who thought they were in an ESP experiment overheard what seemed to be an emergency. A “victim” cried out that a bookcase was falling on her; this was followed by a scream and a loud crash. There was no difference in helping behavior between the condition in which there were no other bystanders present and the condition in which the other bystander could not help. However, as predicted, Ss in both of these conditions helped significantly sooner than Ss in the condition in which the other bystander was perceived as being able to help.     

Intervention in the Library: The Effect of Increased Responsibility on Bystanders' Willingness To Prevent a Theft

Two field experiments tested the hypothesis that a bystander's increased responsibility to act increases the likelihood of his helping the victim of an emergency. In Experiment 1, an individual asked or did not ask the bystander to protect his property in his absence. In Experiment 2, the presence/absence of an unattentive confederate was varied orthogonally to the request/no request manipulation. The results of both experiments indicated that bystanders who received a prior request for protective assistance felt more personally responsible for protecting the individual's property and were more likely to prevent a theft of that property than were bystanders who received no request. The presence of a confederate in Experiment 2 decreased bystanders' felt responsibility and their willingness to intervene on the victim's behalf. The results were interpreted as support for the "felt responsibility" proposition of the Latané and Darley (1970) model of bystander intervention.     

The impact of onlooking and including bystander behaviour on judgments and emotions regarding peer exclusion

We investigated judgments and emotions in contexts of social exclusion that varied as a function of bystander behaviour (N = 173, 12‐ and 16‐year‐olds). Adolescents responded to film vignettes depicting a target excluded by a group with no bystanders, onlooking bystanders, or bystanders who included the target. Adolescents were asked to judge the behaviour and attribute emotions to the excluding group, the excluded target, and the bystanders. Younger adolescents judged the behaviour of the excluding group as more wrong than older adolescents when there were no bystanders present, indicating that the presence of bystanders was viewed as lessening the negative outcome of exclusion by the younger group. Yet, bystanders play a positive role only when they are includers, not when they are silent observers. This distinction was revealed by the findings that adolescents rated the behaviour of onlooking bystanders as more wrong compared with the behaviour of including bystanders. Moreover, all adolescents justified the inclusive behaviour more frequently with empathy than the onlooking behaviour. Adolescents also anticipated more empathy to including bystanders than to onlooking bystanders, as well as anticipated more guilt to onlooking bystanders than including bystanders. The findings are discussed in light of the role of group norms and group processes regarding bystanders' roles in social exclusion peer encounters.     

Bystander response to arterial bleeding: helping skills, the decision-making process, and differentiating the helping response

Using a mock injury involving arterial bleeding, we explored the impact of variables on two different decisions in the decision-making process leading to help. Expertise (Red Cross Training), ambiguity, and number of bystanders were manipulated in a 2 X 2 X 2 design. We observed the following responses: (a) nonhelp, (b) ineffective direct help, (c) indirect help, and (d) direct help. The decision to help or not was affected by ambiguity, sex, and the presence or absence of other bystanders. Greater ambiguity led to less help; women helped less than men; and fewer people helped when other bystanders were present. Expertise affected the decision leading to the type of help used but not the decision to help. Although training did not raise the intervention rate, it did dramatically change the effectiveness of the help used and could yield as many as 28 more saved lives out of 80 such incidents. The number of bystanders affected both the decision to help and the type of help used. Ineffective direct help occurred most frequently when the bystander was alone. The presence of other bystanders also affected the type of indirect help that was used.     

元回归中效应量的最小个数需求：基于统计功效和估计精度

元回归模型被广泛应用于调节变量的识别。从元分析技术的原理谈起, 介绍了元回归模型, 然后采用蒙特卡洛模拟, 基于统计功效和估计精度探究效应量个数对元回归模型参数估计的影响, 从而确立效应量的最小个数需求。主要研究结果为：(1) Wald-type z检验方法在元回归中易犯I类错误; (2)为达到参数估计要求, 元回归至少需要20个效应量; (3)纳入合适的调节变量能降低对效应量的个数需求。基于研究结果, 提出以下建议：(1)研究者应慎重使用Wald-type z检验方法和CMA软件; (2)研究者至少需要20个效应量, 且应当根据实际情况进一步增加效应量个数; (3)研究者应当积极探索合适的调节变量; (4)未来审稿人可参考最小效应量个数需求对元回归研究进行质量评估。     

When to intervene and take a stand: Evaluating bystander roles in intergroup name-calling contexts

Children (n = 121, M = 9.86 years, SD = 0.64) and adolescents (n = 101, M = 12.84 years, SD = 0.69) evaluated proactive and passive bystander behaviour to intergroup name-calling (N = 222, 54% female). Scenarios depicted ingroup perpetrators and outgroup victims who were from a stigmatized group (ethnicity) or a non-stigmatized group (school affiliation), with bystanders depicted as being proactive (intervening to help) or passive (failing to challenge the aggression), counter to their own group's norm. Children and adolescents personally evaluated proactive bystanders more favourably than passive bystanders. However, adolescents, more than children, expected their peers to be more positive about proactive bystanders than passive bystanders in the stigmatized context. Results are discussed in terms of the complexities of bystander decisions and implications for anti-bullying interventions.     

Real behavior in virtual environments: psychology experiments in a simple virtual-reality paradigm using video games

The purpose of this research was to illustrate the broad usefulness of simple video-game-based virtual environments (VEs) for psychological research on real-world behavior. To this end, this research explored several high-level social phenomena in a simple, inexpensive computer-game environment: the reduced likelihood of helping under time pressure and the bystander effect, which is reduced helping in the presence of bystanders. In the first experiment, participants had to find the exit in a virtual labyrinth under either high or low time pressure. They encountered rooms with and without virtual bystanders, and in each room, a virtual person requested assistance. Participants helped significantly less frequently under time pressure but the presence/absence of a small number of bystanders did not significantly moderate helping. The second experiment increased the number of virtual bystanders, and participants were instructed to imagine that these were real people. Participants helped significantly less in rooms with large numbers of bystanders compared to rooms with no bystanders, thus demonstrating a bystander effect. These results indicate that even sophisticated high-level social behaviors can be observed and experimentally manipulated in simple VEs, thus implying the broad usefulness of this paradigm in psychological research as a good compromise between experimental control and ecological validity.     

Peer Bystanders to Bullying: Who Wants to Play with the Victim?

Given widespread concern associated with school-based bullying, researchers have looked beyond a dyadic perspective (i.e., bullies and victims only), and now consider the broader social ecology of the peer group. In this research, we examined how the behaviors of peer bystanders influence subsequent reactions to bullies and their victims. Two hundred and six 10- to 15-year-old boys (Mage?=?12.46) were invited to play a computer game with three other boys allegedly located at another school. Before the start of the game, participants “met the other players” apparently sitting in a waiting room. These child actors depicted an escalating bullying episode in which the behavior of the bystander was manipulated: aide to the bully, defender of the victim, or passive outsider. Immediately after exposure to the bullying, each participant played a ball toss game (Cyberball) with the three other boys in the video. Individual differences among participants were examined as moderators of the effect of bystander behavior on participants’ willingness to include the “victim” in the game. Results indicated that, when exposed to a passive bystander, boys’ normative beliefs about aggression, as well as their tendency to morally disengage from observed egregious acts, decreased their willingness to include the victim in the game.     

The development of bystander intentions and social–moral reasoning about intergroup verbal aggression

A developmental intergroup approach was taken to examine the development of prosocial bystander intentions among children and adolescents. Participants as bystanders (N = 260) aged 8–10 and 13–15 years were presented with scenarios of direct aggression between individuals from different social groups (i.e., intergroup verbal aggression). These situations involved either an ingroup aggressor and an outgroup victim or an outgroup aggressor and an ingroup victim. This study focussed on the role of intergroup factors (group membership, ingroup identification, group norms, and social–moral reasoning) in the development of prosocial bystander intentions. Findings showed that prosocial bystander intentions declined with age. This effect was partially mediated by the ingroup norm to intervene and perceived severity of the verbal aggression. However, a moderated mediation analysis showed that only when the victim was an ingroup member and the aggressor an outgroup member did participants become more likely with age to report prosocial bystander intentions due to increased ingroup identification. Results also showed that younger children focussed on moral concerns and adolescents focussed more on psychological concerns when reasoning about their bystander intention. These novel findings help explain the developmental decline in prosocial bystander intentions from middle childhood into early adolescence when observing direct intergroup aggression.     

A classmate in distress: schoolchildren as bystanders and their reasons for how they act

Research has shown that bystanders more often fail to or are slower to help a victim in emergency when there are other bystanders than when there are not. The study presented in this paper is a qualitative case study with a focus on students’ own reasons why they do not help a classmate in emergency when there are other children witnessing the emergency situation in the real-life classroom case studied. Grounded theory methods were used to analyse the data. The individual conversations with the students indicated a variety of definitions of the specific distress situation when they recalled and talked about the classroom incident. During the process of the analysis seven concepts of definitions associated with passive or non-intervention bystander behaviour were constructed and grounded in the empirical material: trivialisation, dissociation, embarrassment association, busy working priority, compliance with a competitive norm, audience modelling, and responsibility transfer. Relations between these concepts of definitions were also analysed. However, this study is a first step and a first report from an ongoing study about school children as helper and bystander.     

Bystander Responses to Risk for Rape Perpetrated by a Friend,Acquaintance, or Stranger

This study explored bystander responses to risk for an alcohol-facilitated rape perpetrated by a friend, acquaintance, or stranger. Undergraduates (N = 331) were randomly assigned to read 1 of 3 scenarios in which an apparently sober male friend, acquaintance, or stranger leads an intoxicated woman into a bedroom. Participants completed self-report measures of intent to directly intervene and barriers to intervention. Compared to men, women reported greater intent to help the potential victim and fewer barriers to intervention. Participant gender moderated the effect of the bystander’s relationship with the potential perpetrator on intent to confront and responsibility to intervene. Men reported more confrontation and more responsibility to intervene when perpetrators were identified as either friends or acquaintances than strangers. In contrast, women reported more confrontation when perpetrators were identified as friends than either strangers or acquaintances. Bystander education programs that address specific barriers to intervening with strangers and acquaintances could promote more frequent bystander behavior.