Name of a German horse reputed to have advanced skills in arithmetic. In fact, Hans was responding (cleverly) to very subtle and UNCONSCIOUS cues from his trainer about when to start 'counting' by pawing the ground, and when to stop.
Clever Hans is symptomatic of the anthropomorphism that has plagued the study of PSYCHOLOGY since man first began to domesticate animals and was struck by some of their apparently human responses. This PHENOMENON has become more complex with the attention being paid to the ROLE of language in thought. Some psychologists have been struck by the apparently human linguistic abilities of chimps. Though this claim is harder to disprove than the case of Clever Hans, there is no clear evidence that chimps, or any other animals, have anything remotely approaching the linguistic and intellectual understanding or creativity of humans.