In this video, I explain two well-known examples of observer bias: the case of Clever Hans, and Rosenthal and Fode’s experiment with “bright” and “dull” rats. Observer bias (or experimenter …
Was Hans really Clever?
Here’s a good video summary of the case of Clever Hans and how Oskar Pfungst was able to figure out that Wilhelm von Osten was inadvertently signaling answers to Hans. …