I will give brain list. for sure A psychology professor introduced the same male guest lecturer to two different classes. 2The first class was told to expect a rather cold, dull, uninteresting person. 3The second class was told to expect a warm, intelligent, friendly lecturer. 4The lecturer presented identical information in the same manner to both groups. 5The first group found his lecture boring and did not ask questions; the second group found him warm and stimulating and asked many questions. 6This experiment has been replicated successfully many times. 7The outcome of these experiments suggests that telling someone what to perceive in another person will influence what is experienced.

A. definition and example.
B. cause and effect.