in a field experiment , a woman (who was actually part of the experiment) stood by her car on the side of road. the car had a flat tire. to determine if modeling would affect the helping behavior of passing motorist, on some trials another woman with a flat tire was helped by a stopped motorist (all part of the staged event) about a quarter of a mile before the place where the woman waited had just witnessed another person helping (Bryan & test, 1967).