Part 1 of Essay
Rosenthal and Jacobson (1966) sought to test the experimenter expectancy effect by examining how much of an outcome teachers' expectancies could have on a group of children. Earlier investigations in this area were also conducted by Rosenthal (1963). He worked with children in a research lab, giving each one a rat and te ....

Part 2 of Essay
.... the experts did not realize was that their own hopes for the horse to answer the questions, were giving the horse signs on which he based his answers. That is, if someone on the committee raised his/her eyebrows in anticipation of the oncoming correct answer, the horse would stop stomping. Once again, the experimenter's cues decided the outcome of the tests. Acting on these results, Rosenthal and Jacobson hypothesized that teacher's expectancies would cause them unintentionally to treat the students they th ....