Which historical example was one of the first demonstrations of the experimenter expectancy effect?
A)Mesmer and his magnetized trees
B)Clever Hans and his mathematical abilities
C)Prefrontal lobotomy cures for depression
D)Ancient African voodoo practices

Question

Quizplus · Accepted Answer

Clever Hans, a horse that appeared to perform arithmetic, was actually responding to subtle cues from his handler, demonstrating the experimenter expectancy effect.

Which Historical Example Was One of the First Demonstrations of the Experimenter