This second video shows the bystander effect in the situation of a smoke filled room. This is adapted from Darley and Latané's experiment in 1968.
The first condition, a participant fills out a survey alone. Smoke soon appears through a vent door.
The second conditon, a participant fills out a survey amongst a number of confederates. Again, smoke appears through a vent, each confederate fails to notice, and the participant fails to act. This experiment is a replica of the 1968 study by Darley & Latane.