Philip zimbardo devised a simulated prison and randomly assigned college students to serve as prisoners or guards. This experiment best illustrated the impact of

role-playing on attitudes.

Explanation:

Within the context of attitudes, role-playing refers to the act of embodying another roles or character that is not represent ourselves in normal situation.

In the simulated prison, the subjects are consist of students who actually friends/kinda know each other. They are divided into two groups and assigned either a guard or prisoners role.

Zimbardo then observed the interaction between the two groups. As it turns out, even if the guards know that their roles are fake, they start to abusing the prisoners as if they actually have power over them.