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.
While Pfungst worked as an assistant under Carl Stumpf in Berlin’s laboratory, he was asked to scrutinize the horse Clever Hans, which seemed adept at solving diverse arithmetic challenges set by its owner.