they put him or her in a room with a TV screen that showed another person in a different room in the building ; then they left. students in the first group thought that they were alone in the building . student in the second group thought that there was one other person in the building. students in the third group thought that there were four other people in the building. as part of the experiment, the person on the TV screen pretended to become ill and called out for help. in the first group , where students