"Subsequent manipulations showed that a lone student will respond 75% of the time; while a student accompanied by two actors told to feign apathy will respond o

"Subsequent manipulations showed that a lone student will respond 75% of the time; while a student accompanied by two actors told to feign apathy will respond only 10% of the time" My own anecdotal data confirms this: a colleague crashed with his bike just meters from our office. Pretty much the entire company stood there watching him bleeding and screaming on the pavement. I called the ambulance,as it didn't seem anyone was considering doing it at all. I'm sure every single of them would have called the ambulance if they were there on their own. On a different occasion,a friend pulled a few almost drowning drunk guests out of water during a wedding,while the rest stood on the shore watching the whole situation.