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 expectancy effect) is considered, along with an explanation for how to reduce this bias.

Don’t forget to subscribe to the channel to see future videos! Have questions or topics you’d like to see covered in a future video? Let me know by commenting or sending me an email!

Need more explanation? Check out my full psychology guide: Master Introductory Psychology: http://amzn.to/2eTqm5s

Enable closed-captioning or find a full transcript of this video here: http://www.psychexamreview.com/observer-bias-clever-horses-and-dull-rats/