Search

When on camera, passive onlooker comes to the rescue

“When many bystanders are present during an emergency, people intervene less often and less quickly than when they are the only witness.”

This phenomenon is also referred to as the passive bystander effect or the bystander effect. However, when people are made aware of their public presence in a busy social environment, for example through the presence of CCTV, they are more likely to offer their help. Reputation appears to be an important factor in the bystander effect.

(This Factsheet is only available in Dutch.)

dr. Jan-Willem van Prooijen

About dr. Jan-Willem van Prooijen


Jan-Willem van Prooijen studied psychology at Leiden University, where he graduated in 1998 at the department of Social and Organisational Psychology, and at the department of Psychometrics and Research Methodology. In 2002 he received his PhD at the department of Social and Organisational Psychology at Leiden University, on a thesis about the relationship between group dynamics and procedural justice.
He started working as an Assistant Professor at the Department of Social and Organisational Psychology of VU Amsterdam in 2001. As of 2007, he has been working at this same department as an Associate Professor. Furthermore, since 2011 he is affiliated with the NSCR as Senior Researcher.
In his research, Jan-Willem van Prooijen uses both experimental and applied research methods. Among the topics of his research are perceptions of injustice, belief in conspiracy theories, and ideological extremism. He currently serves on the editorial board of various prominent international journals, and regularly appears in the media. Recently he was elected the next President of the International Society for Justice Research (ISJR); his presidency will begin in 2016 and run until 2018.

Jan-Willem is NSCR-VU Fellow and member of the Extremism/Terrorism Cluster and the Technological innovations (CRIME Lab) Cluster.

Link to personal website.

View All Posts