The Bystander Effect
Same emergency. Once you are alone. Once you are one of many.
What this is
Eight emergency scenarios in four hidden pairs. Each pair is the same emergency, twice. Once you are the only witness. Once you are one of many. The pairs are not adjacent — they are scattered. You move a slider for each scenario predicting your own likelihood of intervening within the first 30 seconds.
At the end I compute your Bystander Gap: the average likelihood you predicted for the alone scenarios minus the average for the group scenarios. A gap near zero says you believe a crowd does not change you. A gap near 50 puts you inside the Darley & Latane (1968) founding paradigm.
A note before we start
Sixty years of lab and field research, starting with Darley & Latane (1968) JPSP vol 8 and consolidated through Fischer Krueger Greitemeyer et al (2011) Psychological Bulletin vol 137 105-study meta, finds an average d=0.45 group-size effect on intervention. Garcia Weaver Moskowitz & Darley (2002) JPSP vol 83 found that lay subjects systematically predict near-zero gaps for themselves and then exhibit the founding 30-50 point gap in lab paradigms the following week. The empathy gap is the meta-bias.
No login. No data leaves your browser. Eight scenarios, roughly four minutes.