Included in your order is an aluminum allow pretraining chamber that limits the mouse or rat to swim in the morris water maze. The pretraining chamber allows the researcher to gently introduce the rodent into a liquid/water/milk apparatus and learn to minimize anxiety and fear related responses, maximizing learning responses during trials. MazeEngineers offers multiple configurations for the pretraining chamber, most economically the 4 sided chamber fitting the 4 or 5 foot morris water maze