bystander effect


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bystander effect

A social psychological phenomenon in which the more people there are viewing a crisis or crime, the less likely they are to offer aid to the victim(s). Also known as bystander apathy. Over 30 people saw the mugging take place, but due to the bystander effect, none of them intervened.
See also: bystander, effect
References in periodicals archive ?
The bystander effect is not to be underestimated," agreed Nidal Najjar Daou, a behavioral psychologist and an assistant professor at the American University of Beirut.
But what was most interesting of all was learning about the bystander effect - that's when people toddle on past someone in need because they think someone else will help.
The bystander effect sounds harsh, but responsibility can be diffused among a crowd, causing a crisis to become impersonal and dehumanizing.
However, surveillance cameras decrease people's susceptibility to the bystander effect.
The bystander effect has been a much researched phenomenon by psychologists and it assumes that most people caught up in this do not act in dire situations to help others because they shift responsibility to others watching in the crowd.
Using a mouse model with tumors derived from human breast cancer cell lines, the researchers demonstrated a "profound" inhibition of tumor growth within 2 weeks of delivery of the MDA-7/IL-24 gene to the primary site, and also a marked bystander effect in secondary sites.
The phenomenon is known as the bystander effect or Genovese syndrome, where groups of people do not respond in desperate situations because they assume someone else will.
The significance of the bystander effect for alpha particles is that linear extrapolation of the risk of carcinogenesis from high doses to low doses would underestimate the risks at low doses (Hall 2003).
of Western Ontario, Canada, provides administrators with an explanation and understanding of the bystander effect in bullying through the use of narrative and research data (personal anecdotes and description of social science research and studies).
The bystander effect occurs when untreated lesions also respond, possibly because the drug stimulates the immune system to attack distant tumors.
This finding is probably explained by an uncontrolled covariate, bystander effect (Hudson & Bruckman, 2004).
Dr Peter Fischer said, 'The classical bystander effect was replicated when the situation involved low potential danger, but not when the situation involved high potential danger.
If we could enhance the bystander effect within tumours, we could develop much more effective systems of radiotherapy, perhaps using lower doses to reduce side effects.
One of the ways HIV does damage is not just by replicating, but by a bystander effect on myelinization," he explained.
sense that chronic PA patients might have a vascular bystander effect of impaired endothelial function and atherogenic stimuli, unrelated to traditional risk factors," he said in an interview "In this setting, an elevated lipid panel, smoking, hypertension, etc.