Instrumental Conditioning of Lemon Sharks

See allHide authors and affiliations

Science  24 Jul 1959:
Vol. 130, Issue 3369, pp. 217-218
DOI: 10.1126/science.130.3369.217-a


Two sharks were trained to feed at a target which, when pressed, caused a submerged bell to ring. Later they were trained to press the target for remotely placed food. They retained this conditioned response after a 10-week period of inactivity.