Milgram,by having a group of confederates stare up at a point on a distant building,discovered people who passed by would also stare up at the same point on the distant building if there were five or more confederates in the stimulus group.

Milgram

Refers to Stanley Milgram, a psychologist known for his experiments on obedience, demonstrating how people are willing to follow authorities even to the extent of harming others.

Confederates

Individuals who are part of a larger group or cause, often used in the context of the American Civil War or in experimental research to describe participants who are in on the experiment's aims.