Water maze
Encyclopedia
The term water maze is used for a maze that is filled with water to motivate the subject, generally a rodent
Rodent
Rodentia is an order of mammals also known as rodents, characterised by two continuously growing incisors in the upper and lower jaws which must be kept short by gnawing....

, to escape. There are water-maze versions of the radial arm maze
Radial arm maze
The radial arm maze was designed by Olton and Samuelson in 1976 to measure spatial learning and memory in rats. The original apparatus consists of eight equidistantly spaced arms, each about 4 feet long, and all radiating from a small circular central platform...

, T- and Y-mazes, etc.
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