Clever Hans (The horse of Mr. Von Osten): A contribution to experimental animal and human psychology

"A horse that solves correctly problems in multiplication and division by means of tapping. Persons of unimpeachable honor, who in the master's absence have received responses, and assure us that in the process they have not made even the slightest sign. Thousands of spectators, horse-fanciers, trick-trainers of first rank, and not one of them during the course of many months' observations are able to discover any kind of regular signal. That was the riddle. And its solution was found in the unintentional minimal movements of the horse's questioner."

Authors who, from today's perspective and in the face of current research, were far ahead of their time were often misunderstood or simply ignored by their contemporaries.
And even if an excerpt from an extensive work is always subjective, it still offers a middle ground between subsuming under a catchphrase on the one hand, and intensive preoccupation with the author and his work on the other. If you want to deal intensively with the work, please refer to a reprint.

Auteur
Oskar Pfungst:Pfungst lived from 21 April 1874 to 14 August 1932. He was a German comparative biologist and psychologist. While working as a volunteer assistant in the laboratory of Carl Stumpf in Berlin, Pfungst was asked to investigate the horse known as Clever Hans, who could apparently solve a wide array of arithmetic problems set to it by its owner.Bernhard J. Schmidt:Science and social psychologist, textbook author,lives in Germany