First introduced by William von Osten, his fame led to a book co-authored by Carl Leo Rahn and the development of an observer-expectancy effect.
First introduced by William von Osten, his fame led to a book co-authored by Carl Leo Rahn and the development of an observer-expectancy effect. Famously studied by Carl Stumpf, he was allegedly able to count and do arithmetic by tapping his hoof. FTP, name this really smart horse. 
First introduced by William von Osten, his fame led to a book co-authored by Carl Leo Rahn and the development of an observer-expectancy effect.
Clever Hans