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Image of a rat making an individual tongue contact with the lick disc. The tongue extends through a 12-mm diameter hole in the bottom of the transparent enclosure. On the left is the tubing through which water is pumped through a hole drilled into the side of the aluminum disc. The hole is drilled such that the water enters the side of the disc and exits the top through a hole at the center. The plastic splash cone protects the transducer housing (large cylinder) from water.
